Dave Van Wagner / Mbed OS c-simple-emu6502-cbm

6502 emulator for Commodore 64 ROMs, serial terminal edition for MBED. Recommend terminal echo on, line edit on, caps lock, 115200bps, implicit carriage return on newline, currently non-buffered so don't paste lots of stuff

More details at:

[https://github.com/davervw] [https://techwithdave.davevw.com/2020/03/simple-emu-c64.html]

emu6502.cpp@4:0461c100cbbb, 2020-04-12 (annotated)

Committer:
davervw
Date:
Sun Apr 12 19:26:44 2020 +0000
Revision:
4:0461c100cbbb
Parent:
0:90de1cbc8a5f
Child:
7:f49fa56672d8
IRQ/RTI bug fixes, IRQ implemented, but disabled as [invisible] screen input interferes with terminal input

Who changed what in which revision?

UserRevisionLine numberNew contents of line
davervw 0:90de1cbc8a5f 1 // emu6502.c - Emu6502 - MOS6502 Emulator
davervw 0:90de1cbc8a5f 2 //
davervw 0:90de1cbc8a5f 3 ////////////////////////////////////////////////////////////////////////////////
davervw 0:90de1cbc8a5f 4 //
davervw 0:90de1cbc8a5f 5 // c-simple-emu-cbm (C Portable Version)
davervw 0:90de1cbc8a5f 6 // C64/6502 Emulator for Microsoft Windows Console
davervw 0:90de1cbc8a5f 7 //
davervw 0:90de1cbc8a5f 8 // MIT License
davervw 0:90de1cbc8a5f 9 //
davervw 0:90de1cbc8a5f 10 // Copyright(c) 2020 by David R.Van Wagner
davervw 0:90de1cbc8a5f 11 // davevw.com
davervw 0:90de1cbc8a5f 12 //
davervw 0:90de1cbc8a5f 13 // Permission is hereby granted, free of charge, to any person obtaining a copy
davervw 0:90de1cbc8a5f 14 // of this software and associated documentation files (the "Software"), to deal
davervw 0:90de1cbc8a5f 15 // in the Software without restriction, including without limitation the rights
davervw 0:90de1cbc8a5f 16 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
davervw 0:90de1cbc8a5f 17 // copies of the Software, and to permit persons to whom the Software is
davervw 0:90de1cbc8a5f 18 // furnished to do so, subject to the following conditions:
davervw 0:90de1cbc8a5f 19 //
davervw 0:90de1cbc8a5f 20 // The above copyright notice and this permission notice shall be included in all
davervw 0:90de1cbc8a5f 21 // copies or substantial portions of the Software.
davervw 0:90de1cbc8a5f 22 //
davervw 0:90de1cbc8a5f 23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
davervw 0:90de1cbc8a5f 24 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
davervw 0:90de1cbc8a5f 25 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
davervw 0:90de1cbc8a5f 26 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
davervw 0:90de1cbc8a5f 27 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
davervw 0:90de1cbc8a5f 28 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
davervw 0:90de1cbc8a5f 29 // SOFTWARE.
davervw 0:90de1cbc8a5f 30 //
davervw 0:90de1cbc8a5f 31 ////////////////////////////////////////////////////////////////////////////////
davervw 0:90de1cbc8a5f 32
davervw 0:90de1cbc8a5f 33 //#define snprintf sprintf_s
davervw 0:90de1cbc8a5f 34
davervw 0:90de1cbc8a5f 35 #include <mbed.h>
davervw 0:90de1cbc8a5f 36 #include "emu6502.h"
davervw 0:90de1cbc8a5f 37
davervw 0:90de1cbc8a5f 38 // global references
davervw 0:90de1cbc8a5f 39 extern Serial pc;
davervw 0:90de1cbc8a5f 40
davervw 0:90de1cbc8a5f 41 // globals
davervw 0:90de1cbc8a5f 42 byte A = 0;
davervw 0:90de1cbc8a5f 43 byte X = 0;
davervw 0:90de1cbc8a5f 44 byte Y = 0;
davervw 0:90de1cbc8a5f 45 byte S = 0xFF;
davervw 0:90de1cbc8a5f 46 bool N = false;
davervw 0:90de1cbc8a5f 47 bool V = false;
davervw 0:90de1cbc8a5f 48 bool B = false;
davervw 0:90de1cbc8a5f 49 bool D = false;
davervw 0:90de1cbc8a5f 50 bool I = false;
davervw 0:90de1cbc8a5f 51 bool Z = false;
davervw 0:90de1cbc8a5f 52 bool C = false;
davervw 0:90de1cbc8a5f 53 ushort PC = 0;
davervw 0:90de1cbc8a5f 54 bool trace = false;
davervw 0:90de1cbc8a5f 55 bool step = false;
davervw 0:90de1cbc8a5f 56
davervw 4:0461c100cbbb 57 #define USE_IRQ 0
davervw 4:0461c100cbbb 58
davervw 0:90de1cbc8a5f 59 extern void ResetRun(bool (*ExecutePatch)(void))
davervw 0:90de1cbc8a5f 60 {
davervw 0:90de1cbc8a5f 61 ushort addr = (ushort)((GetMemory(0xFFFC) | (GetMemory(0xFFFD) << 8))); // RESET vector
davervw 0:90de1cbc8a5f 62 Execute(addr, ExecutePatch);
davervw 0:90de1cbc8a5f 63 }
davervw 0:90de1cbc8a5f 64
davervw 0:90de1cbc8a5f 65 #ifndef WIN32
davervw 0:90de1cbc8a5f 66 static void strcpy_s(char* dest, size_t size, const char* src)
davervw 0:90de1cbc8a5f 67 {
davervw 0:90de1cbc8a5f 68 strncpy(dest, src, size);
davervw 0:90de1cbc8a5f 69 }
davervw 0:90de1cbc8a5f 70
davervw 0:90de1cbc8a5f 71 static void strcat_s(char* dest, size_t size, const char* src)
davervw 0:90de1cbc8a5f 72 {
davervw 0:90de1cbc8a5f 73 strncat(dest, src, size);
davervw 0:90de1cbc8a5f 74 }
davervw 0:90de1cbc8a5f 75 #endif
davervw 0:90de1cbc8a5f 76
davervw 0:90de1cbc8a5f 77 static void PHP()
davervw 0:90de1cbc8a5f 78 {
davervw 0:90de1cbc8a5f 79 int flags = (N ? 0x80 : 0)
davervw 0:90de1cbc8a5f 80 | (V ? 0x40 : 0)
davervw 0:90de1cbc8a5f 81 | (B ? 0x10 : 0)
davervw 0:90de1cbc8a5f 82 | (D ? 0x08 : 0)
davervw 0:90de1cbc8a5f 83 | (I ? 0x04 : 0)
davervw 0:90de1cbc8a5f 84 | (Z ? 0x02 : 0)
davervw 0:90de1cbc8a5f 85 | (C ? 0x01 : 0);
davervw 0:90de1cbc8a5f 86 Push(flags);
davervw 0:90de1cbc8a5f 87 }
davervw 0:90de1cbc8a5f 88
davervw 0:90de1cbc8a5f 89 extern byte LO(ushort value)
davervw 0:90de1cbc8a5f 90 {
davervw 0:90de1cbc8a5f 91 return (byte)value;
davervw 0:90de1cbc8a5f 92 }
davervw 0:90de1cbc8a5f 93
davervw 0:90de1cbc8a5f 94 extern byte HI(ushort value)
davervw 0:90de1cbc8a5f 95 {
davervw 0:90de1cbc8a5f 96 return (byte)(value >> 8);
davervw 0:90de1cbc8a5f 97 }
davervw 0:90de1cbc8a5f 98
davervw 0:90de1cbc8a5f 99 static void BRK(byte *p_bytes)
davervw 0:90de1cbc8a5f 100 {
davervw 0:90de1cbc8a5f 101 ++PC;
davervw 0:90de1cbc8a5f 102 Push(HI(PC));
davervw 0:90de1cbc8a5f 103 Push(LO(PC));
davervw 4:0461c100cbbb 104 PHP();
davervw 0:90de1cbc8a5f 105 B = true;
davervw 0:90de1cbc8a5f 106 PC = (ushort)(GetMemory(0xFFFE) + (GetMemory(0xFFFF) << 8));
davervw 0:90de1cbc8a5f 107 *p_bytes = 0;
davervw 0:90de1cbc8a5f 108 }
davervw 0:90de1cbc8a5f 109
davervw 0:90de1cbc8a5f 110 static byte Subtract(byte reg, byte value, bool *p_overflow)
davervw 0:90de1cbc8a5f 111 {
davervw 0:90de1cbc8a5f 112 bool old_reg_neg = (reg & 0x80) != 0;
davervw 0:90de1cbc8a5f 113 bool value_neg = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 114 int result = reg - value - (C ? 0 : 1);
davervw 0:90de1cbc8a5f 115 N = (result & 0x80) != 0;
davervw 0:90de1cbc8a5f 116 C = (result >= 0);
davervw 0:90de1cbc8a5f 117 Z = (result == 0);
davervw 0:90de1cbc8a5f 118 bool result_neg = (result & 0x80) != 0;
davervw 0:90de1cbc8a5f 119 *p_overflow = (old_reg_neg && !value_neg && !result_neg) // neg - pos = pos
davervw 0:90de1cbc8a5f 120 || (!old_reg_neg && value_neg && result_neg); // pos - neg = neg
davervw 0:90de1cbc8a5f 121 return (byte)result;
davervw 0:90de1cbc8a5f 122 }
davervw 0:90de1cbc8a5f 123
davervw 0:90de1cbc8a5f 124 static byte SubtractWithoutOverflow(byte reg, byte value)
davervw 0:90de1cbc8a5f 125 {
davervw 0:90de1cbc8a5f 126 C = true; // init for CMP, etc.
davervw 0:90de1cbc8a5f 127 bool unused;
davervw 0:90de1cbc8a5f 128 return Subtract(reg, value, &unused);
davervw 0:90de1cbc8a5f 129 }
davervw 0:90de1cbc8a5f 130
davervw 0:90de1cbc8a5f 131 static void CMP(byte value)
davervw 0:90de1cbc8a5f 132 {
davervw 0:90de1cbc8a5f 133 SubtractWithoutOverflow(A, value);
davervw 0:90de1cbc8a5f 134 }
davervw 0:90de1cbc8a5f 135
davervw 0:90de1cbc8a5f 136 static void CPX(byte value)
davervw 0:90de1cbc8a5f 137 {
davervw 0:90de1cbc8a5f 138 SubtractWithoutOverflow(X, value);
davervw 0:90de1cbc8a5f 139 }
davervw 0:90de1cbc8a5f 140
davervw 0:90de1cbc8a5f 141 static void CPY(byte value)
davervw 0:90de1cbc8a5f 142 {
davervw 0:90de1cbc8a5f 143 SubtractWithoutOverflow(Y, value);
davervw 0:90de1cbc8a5f 144 }
davervw 0:90de1cbc8a5f 145
davervw 0:90de1cbc8a5f 146 static void SetReg(byte *p_reg, int value)
davervw 0:90de1cbc8a5f 147 {
davervw 0:90de1cbc8a5f 148 *p_reg = (byte)value;
davervw 0:90de1cbc8a5f 149 Z = (*p_reg == 0);
davervw 0:90de1cbc8a5f 150 N = ((*p_reg & 0x80) != 0);
davervw 0:90de1cbc8a5f 151 }
davervw 0:90de1cbc8a5f 152
davervw 0:90de1cbc8a5f 153 static void SetA(int value)
davervw 0:90de1cbc8a5f 154 {
davervw 0:90de1cbc8a5f 155 SetReg(&A, value);
davervw 0:90de1cbc8a5f 156 }
davervw 0:90de1cbc8a5f 157
davervw 0:90de1cbc8a5f 158 static void SetX(int value)
davervw 0:90de1cbc8a5f 159 {
davervw 0:90de1cbc8a5f 160 SetReg(&X, value);
davervw 0:90de1cbc8a5f 161 }
davervw 0:90de1cbc8a5f 162
davervw 0:90de1cbc8a5f 163 static void SetY(int value)
davervw 0:90de1cbc8a5f 164 {
davervw 0:90de1cbc8a5f 165 SetReg(&Y, value);
davervw 0:90de1cbc8a5f 166 }
davervw 0:90de1cbc8a5f 167
davervw 0:90de1cbc8a5f 168 static void SBC(byte value)
davervw 0:90de1cbc8a5f 169 {
davervw 0:90de1cbc8a5f 170 if (D)
davervw 0:90de1cbc8a5f 171 {
davervw 0:90de1cbc8a5f 172 int A_dec = (A & 0xF) + ((A >> 4) * 10);
davervw 0:90de1cbc8a5f 173 int value_dec = (value & 0xF) + ((value >> 4) * 10);
davervw 0:90de1cbc8a5f 174 int result_dec = A_dec - value_dec - (C ? 0 : 1);
davervw 0:90de1cbc8a5f 175 C = (result_dec >= 0);
davervw 0:90de1cbc8a5f 176 if (!C)
davervw 0:90de1cbc8a5f 177 result_dec = -result_dec; // absolute value
davervw 0:90de1cbc8a5f 178 int result = (result_dec % 10) | (((result_dec / 10) % 10) << 4);
davervw 0:90de1cbc8a5f 179 SetA(result);
davervw 0:90de1cbc8a5f 180 N = false; // undefined?
davervw 0:90de1cbc8a5f 181 V = false; // undefined?
davervw 0:90de1cbc8a5f 182 }
davervw 0:90de1cbc8a5f 183 else
davervw 0:90de1cbc8a5f 184 {
davervw 0:90de1cbc8a5f 185 byte result = Subtract(A, value, &V);
davervw 0:90de1cbc8a5f 186 SetA(result);
davervw 0:90de1cbc8a5f 187 }
davervw 0:90de1cbc8a5f 188 }
davervw 0:90de1cbc8a5f 189
davervw 4:0461c100cbbb 190 static void ADC_OP(byte value)
davervw 0:90de1cbc8a5f 191 {
davervw 0:90de1cbc8a5f 192 int result;
davervw 0:90de1cbc8a5f 193 if (D)
davervw 0:90de1cbc8a5f 194 {
davervw 0:90de1cbc8a5f 195 int A_dec = (A & 0xF) + ((A >> 4) * 10);
davervw 0:90de1cbc8a5f 196 int value_dec = (value & 0xF) + ((value >> 4) * 10);
davervw 0:90de1cbc8a5f 197 int result_dec = A_dec + value_dec + (C ? 1 : 0);
davervw 0:90de1cbc8a5f 198 C = (result_dec > 99);
davervw 0:90de1cbc8a5f 199 result = (result_dec % 10) | (((result_dec / 10) % 10) << 4);
davervw 0:90de1cbc8a5f 200 SetA(result);
davervw 0:90de1cbc8a5f 201 Z = (result_dec == 0); // BCD quirk -- 100 doesn't set Z
davervw 0:90de1cbc8a5f 202 V = false;
davervw 0:90de1cbc8a5f 203 }
davervw 0:90de1cbc8a5f 204 else
davervw 0:90de1cbc8a5f 205 {
davervw 0:90de1cbc8a5f 206 bool A_old_neg = (A & 0x80) != 0;
davervw 0:90de1cbc8a5f 207 bool value_neg = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 208 result = A + value + (C ? 1 : 0);
davervw 0:90de1cbc8a5f 209 C = (result & 0x100) != 0;
davervw 0:90de1cbc8a5f 210 SetA(result);
davervw 0:90de1cbc8a5f 211 bool result_neg = (result & 0x80) != 0;
davervw 0:90de1cbc8a5f 212 V = (!A_old_neg && !value_neg && result_neg) // pos + pos = neg: overflow
davervw 0:90de1cbc8a5f 213 || (A_old_neg && value_neg && !result_neg); // neg + neg = pos: overflow
davervw 0:90de1cbc8a5f 214 }
davervw 0:90de1cbc8a5f 215 }
davervw 0:90de1cbc8a5f 216
davervw 0:90de1cbc8a5f 217 static void ORA(int value)
davervw 0:90de1cbc8a5f 218 {
davervw 0:90de1cbc8a5f 219 SetA(A | value);
davervw 0:90de1cbc8a5f 220 }
davervw 0:90de1cbc8a5f 221
davervw 0:90de1cbc8a5f 222 static void EOR(int value)
davervw 0:90de1cbc8a5f 223 {
davervw 0:90de1cbc8a5f 224 SetA(A ^ value);
davervw 0:90de1cbc8a5f 225 }
davervw 0:90de1cbc8a5f 226
davervw 0:90de1cbc8a5f 227 static void AND(int value)
davervw 0:90de1cbc8a5f 228 {
davervw 0:90de1cbc8a5f 229 SetA(A & value);
davervw 0:90de1cbc8a5f 230 }
davervw 0:90de1cbc8a5f 231
davervw 4:0461c100cbbb 232 static void BIT_OP(byte value)
davervw 0:90de1cbc8a5f 233 {
davervw 0:90de1cbc8a5f 234 Z = (A & value) == 0;
davervw 0:90de1cbc8a5f 235 N = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 236 V = (value & 0x40) != 0;
davervw 0:90de1cbc8a5f 237 }
davervw 0:90de1cbc8a5f 238
davervw 0:90de1cbc8a5f 239 static byte ASL(int value)
davervw 0:90de1cbc8a5f 240 {
davervw 0:90de1cbc8a5f 241 C = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 242 value = (byte)(value << 1);
davervw 0:90de1cbc8a5f 243 Z = (value == 0);
davervw 0:90de1cbc8a5f 244 N = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 245 return (byte)value;
davervw 0:90de1cbc8a5f 246 }
davervw 0:90de1cbc8a5f 247
davervw 0:90de1cbc8a5f 248 static byte LSR(int value)
davervw 0:90de1cbc8a5f 249 {
davervw 0:90de1cbc8a5f 250 C = (value & 0x01) != 0;
davervw 0:90de1cbc8a5f 251 value = (byte)(value >> 1);
davervw 0:90de1cbc8a5f 252 Z = (value == 0);
davervw 0:90de1cbc8a5f 253 N = false;
davervw 0:90de1cbc8a5f 254 return (byte)value;
davervw 0:90de1cbc8a5f 255 }
davervw 0:90de1cbc8a5f 256
davervw 0:90de1cbc8a5f 257 static byte ROL(int value)
davervw 0:90de1cbc8a5f 258 {
davervw 0:90de1cbc8a5f 259 bool newC = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 260 value = (byte)((value << 1) | (C ? 1 : 0));
davervw 0:90de1cbc8a5f 261 C = newC;
davervw 0:90de1cbc8a5f 262 Z = (value == 0);
davervw 0:90de1cbc8a5f 263 N = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 264 return (byte)value;
davervw 0:90de1cbc8a5f 265 }
davervw 0:90de1cbc8a5f 266
davervw 0:90de1cbc8a5f 267 static byte ROR(int value)
davervw 0:90de1cbc8a5f 268 {
davervw 0:90de1cbc8a5f 269 bool newC = (value & 0x01) != 0;
davervw 0:90de1cbc8a5f 270 N = C;
davervw 0:90de1cbc8a5f 271 value = (byte)((value >> 1) | (C ? 0x80 : 0));
davervw 0:90de1cbc8a5f 272 C = newC;
davervw 0:90de1cbc8a5f 273 Z = (value == 0);
davervw 0:90de1cbc8a5f 274 return (byte)value;
davervw 0:90de1cbc8a5f 275 }
davervw 0:90de1cbc8a5f 276
davervw 0:90de1cbc8a5f 277 extern void Push(int value)
davervw 0:90de1cbc8a5f 278 {
davervw 0:90de1cbc8a5f 279 SetMemory((ushort)(0x100 + (S--)), (byte)value);
davervw 0:90de1cbc8a5f 280 }
davervw 0:90de1cbc8a5f 281
davervw 0:90de1cbc8a5f 282 extern byte Pop(void)
davervw 0:90de1cbc8a5f 283 {
davervw 0:90de1cbc8a5f 284 return GetMemory((ushort)(0x100 + (++S)));
davervw 0:90de1cbc8a5f 285 }
davervw 0:90de1cbc8a5f 286
davervw 0:90de1cbc8a5f 287 static void PLP()
davervw 0:90de1cbc8a5f 288 {
davervw 0:90de1cbc8a5f 289 int flags = Pop();
davervw 0:90de1cbc8a5f 290 N = (flags & 0x80) != 0;
davervw 0:90de1cbc8a5f 291 V = (flags & 0x40) != 0;
davervw 0:90de1cbc8a5f 292 B = (flags & 0x10) != 0;
davervw 0:90de1cbc8a5f 293 D = (flags & 0x08) != 0;
davervw 0:90de1cbc8a5f 294 I = (flags & 0x04) != 0;
davervw 0:90de1cbc8a5f 295 Z = (flags & 0x02) != 0;
davervw 0:90de1cbc8a5f 296 C = (flags & 0x01) != 0;
davervw 0:90de1cbc8a5f 297 }
davervw 0:90de1cbc8a5f 298
davervw 0:90de1cbc8a5f 299 static void PHA()
davervw 0:90de1cbc8a5f 300 {
davervw 0:90de1cbc8a5f 301 Push(A);
davervw 0:90de1cbc8a5f 302 }
davervw 0:90de1cbc8a5f 303
davervw 0:90de1cbc8a5f 304 static void PLA()
davervw 0:90de1cbc8a5f 305 {
davervw 0:90de1cbc8a5f 306 SetA(Pop());
davervw 0:90de1cbc8a5f 307 }
davervw 0:90de1cbc8a5f 308
davervw 0:90de1cbc8a5f 309 static void CLC()
davervw 0:90de1cbc8a5f 310 {
davervw 0:90de1cbc8a5f 311 C = false;
davervw 0:90de1cbc8a5f 312 }
davervw 0:90de1cbc8a5f 313
davervw 0:90de1cbc8a5f 314 static void CLD()
davervw 0:90de1cbc8a5f 315 {
davervw 0:90de1cbc8a5f 316 D = false;
davervw 0:90de1cbc8a5f 317 }
davervw 0:90de1cbc8a5f 318
davervw 0:90de1cbc8a5f 319 static void CLI()
davervw 0:90de1cbc8a5f 320 {
davervw 0:90de1cbc8a5f 321 I = false;
davervw 0:90de1cbc8a5f 322 }
davervw 0:90de1cbc8a5f 323
davervw 0:90de1cbc8a5f 324 static void CLV()
davervw 0:90de1cbc8a5f 325 {
davervw 0:90de1cbc8a5f 326 V = false;
davervw 0:90de1cbc8a5f 327 }
davervw 0:90de1cbc8a5f 328
davervw 0:90de1cbc8a5f 329 static void SEC()
davervw 0:90de1cbc8a5f 330 {
davervw 0:90de1cbc8a5f 331 C = true;
davervw 0:90de1cbc8a5f 332 }
davervw 0:90de1cbc8a5f 333
davervw 0:90de1cbc8a5f 334 static void SED()
davervw 0:90de1cbc8a5f 335 {
davervw 0:90de1cbc8a5f 336 D = true;
davervw 0:90de1cbc8a5f 337 }
davervw 0:90de1cbc8a5f 338
davervw 0:90de1cbc8a5f 339 static void SEI()
davervw 0:90de1cbc8a5f 340 {
davervw 0:90de1cbc8a5f 341 I = true;
davervw 0:90de1cbc8a5f 342 }
davervw 0:90de1cbc8a5f 343
davervw 0:90de1cbc8a5f 344 static byte INC(byte value)
davervw 0:90de1cbc8a5f 345 {
davervw 0:90de1cbc8a5f 346 ++value;
davervw 0:90de1cbc8a5f 347 Z = (value == 0);
davervw 0:90de1cbc8a5f 348 N = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 349 return (byte)value;
davervw 0:90de1cbc8a5f 350 }
davervw 0:90de1cbc8a5f 351
davervw 0:90de1cbc8a5f 352 static void INX()
davervw 0:90de1cbc8a5f 353 {
davervw 0:90de1cbc8a5f 354 X = INC(X);
davervw 0:90de1cbc8a5f 355 }
davervw 0:90de1cbc8a5f 356
davervw 0:90de1cbc8a5f 357 static void INY()
davervw 0:90de1cbc8a5f 358 {
davervw 0:90de1cbc8a5f 359 Y = INC(Y);
davervw 0:90de1cbc8a5f 360 }
davervw 0:90de1cbc8a5f 361
davervw 0:90de1cbc8a5f 362 static byte DEC(byte value)
davervw 0:90de1cbc8a5f 363 {
davervw 0:90de1cbc8a5f 364 --value;
davervw 0:90de1cbc8a5f 365 Z = (value == 0);
davervw 0:90de1cbc8a5f 366 N = (value & 0x80) != 0;
davervw 0:90de1cbc8a5f 367 return (byte)value;
davervw 0:90de1cbc8a5f 368 }
davervw 0:90de1cbc8a5f 369
davervw 0:90de1cbc8a5f 370 static void DEX()
davervw 0:90de1cbc8a5f 371 {
davervw 0:90de1cbc8a5f 372 X = DEC(X);
davervw 0:90de1cbc8a5f 373 }
davervw 0:90de1cbc8a5f 374
davervw 0:90de1cbc8a5f 375 static void DEY()
davervw 0:90de1cbc8a5f 376 {
davervw 0:90de1cbc8a5f 377 Y = DEC(Y);
davervw 0:90de1cbc8a5f 378 }
davervw 0:90de1cbc8a5f 379
davervw 0:90de1cbc8a5f 380 static void NOP()
davervw 0:90de1cbc8a5f 381 {
davervw 0:90de1cbc8a5f 382 }
davervw 0:90de1cbc8a5f 383
davervw 0:90de1cbc8a5f 384 static void TXA()
davervw 0:90de1cbc8a5f 385 {
davervw 0:90de1cbc8a5f 386 SetReg(&A, X);
davervw 0:90de1cbc8a5f 387 }
davervw 0:90de1cbc8a5f 388
davervw 0:90de1cbc8a5f 389 static void TAX()
davervw 0:90de1cbc8a5f 390 {
davervw 0:90de1cbc8a5f 391 SetReg(&X, A);
davervw 0:90de1cbc8a5f 392 }
davervw 0:90de1cbc8a5f 393
davervw 0:90de1cbc8a5f 394 static void TYA()
davervw 0:90de1cbc8a5f 395 {
davervw 0:90de1cbc8a5f 396 SetReg(&A, Y);
davervw 0:90de1cbc8a5f 397 }
davervw 0:90de1cbc8a5f 398
davervw 0:90de1cbc8a5f 399 static void TAY()
davervw 0:90de1cbc8a5f 400 {
davervw 0:90de1cbc8a5f 401 SetReg(&Y, A);
davervw 0:90de1cbc8a5f 402 }
davervw 0:90de1cbc8a5f 403
davervw 0:90de1cbc8a5f 404 static void TXS()
davervw 0:90de1cbc8a5f 405 {
davervw 0:90de1cbc8a5f 406 S = X;
davervw 0:90de1cbc8a5f 407 }
davervw 0:90de1cbc8a5f 408
davervw 0:90de1cbc8a5f 409 static void TSX()
davervw 0:90de1cbc8a5f 410 {
davervw 0:90de1cbc8a5f 411 SetReg(&X, S);
davervw 0:90de1cbc8a5f 412 }
davervw 0:90de1cbc8a5f 413
davervw 0:90de1cbc8a5f 414 static ushort GetBR(ushort addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 415 {
davervw 0:90de1cbc8a5f 416 *p_conditional = true;
davervw 0:90de1cbc8a5f 417 *p_bytes = 2;
davervw 0:90de1cbc8a5f 418 sbyte offset = (sbyte)GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 419 ushort addr2 = (ushort)(addr + 2 + offset);
davervw 0:90de1cbc8a5f 420 return addr2;
davervw 0:90de1cbc8a5f 421 }
davervw 0:90de1cbc8a5f 422
davervw 0:90de1cbc8a5f 423 static void BR(bool branch, ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 424 {
davervw 0:90de1cbc8a5f 425 ushort addr2 = GetBR(*p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 426 if (branch)
davervw 0:90de1cbc8a5f 427 {
davervw 0:90de1cbc8a5f 428 *p_addr = addr2;
davervw 0:90de1cbc8a5f 429 *p_bytes = 0; // don't advance addr
davervw 0:90de1cbc8a5f 430 }
davervw 0:90de1cbc8a5f 431 }
davervw 0:90de1cbc8a5f 432
davervw 0:90de1cbc8a5f 433 static void BPL(ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 434 {
davervw 0:90de1cbc8a5f 435 BR(!N, p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 436 }
davervw 0:90de1cbc8a5f 437
davervw 0:90de1cbc8a5f 438 static void BMI(ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 439 {
davervw 0:90de1cbc8a5f 440 BR(N, p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 441 }
davervw 0:90de1cbc8a5f 442
davervw 0:90de1cbc8a5f 443 static void BCC(ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 444 {
davervw 0:90de1cbc8a5f 445 BR(!C, p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 446 }
davervw 0:90de1cbc8a5f 447
davervw 0:90de1cbc8a5f 448 static void BCS(ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 449 {
davervw 0:90de1cbc8a5f 450 BR(C, p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 451 }
davervw 0:90de1cbc8a5f 452
davervw 0:90de1cbc8a5f 453 static void BVC(ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 454 {
davervw 0:90de1cbc8a5f 455 BR(!V, p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 456 }
davervw 0:90de1cbc8a5f 457
davervw 0:90de1cbc8a5f 458 static void BVS(ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 459 {
davervw 0:90de1cbc8a5f 460 BR(V, p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 461 }
davervw 0:90de1cbc8a5f 462
davervw 0:90de1cbc8a5f 463 static void BNE(ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 464 {
davervw 0:90de1cbc8a5f 465 BR(!Z, p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 466 }
davervw 0:90de1cbc8a5f 467
davervw 0:90de1cbc8a5f 468 static void BEQ(ushort *p_addr, bool *p_conditional, byte *p_bytes)
davervw 0:90de1cbc8a5f 469 {
davervw 0:90de1cbc8a5f 470 BR(Z, p_addr, p_conditional, p_bytes);
davervw 0:90de1cbc8a5f 471 }
davervw 0:90de1cbc8a5f 472
davervw 0:90de1cbc8a5f 473 static void JSR(ushort *p_addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 474 {
davervw 0:90de1cbc8a5f 475 *p_bytes = 3; // for next calculation
davervw 0:90de1cbc8a5f 476 ushort addr2 = (ushort)(*p_addr + *p_bytes - 1);
davervw 0:90de1cbc8a5f 477 ushort addr3 = (ushort)(GetMemory((ushort)(*p_addr + 1)) | (GetMemory((ushort)(*p_addr + 2)) << 8));
davervw 0:90de1cbc8a5f 478 Push(HI(addr2));
davervw 0:90de1cbc8a5f 479 Push(LO(addr2));
davervw 0:90de1cbc8a5f 480 *p_addr = addr3;
davervw 0:90de1cbc8a5f 481 *p_bytes = 0; // addr already changed
davervw 0:90de1cbc8a5f 482 }
davervw 0:90de1cbc8a5f 483
davervw 0:90de1cbc8a5f 484 static void RTS(ushort *p_addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 485 {
davervw 0:90de1cbc8a5f 486 byte lo = Pop();
davervw 0:90de1cbc8a5f 487 byte hi = Pop();
davervw 0:90de1cbc8a5f 488 *p_bytes = 1; // make sure caller increases addr by one
davervw 0:90de1cbc8a5f 489 *p_addr = (ushort)((hi << 8) | lo);
davervw 0:90de1cbc8a5f 490 }
davervw 0:90de1cbc8a5f 491
davervw 0:90de1cbc8a5f 492 static void RTI(ushort *p_addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 493 {
davervw 0:90de1cbc8a5f 494 PLP();
davervw 4:0461c100cbbb 495 byte lo = Pop();
davervw 0:90de1cbc8a5f 496 byte hi = Pop();
davervw 0:90de1cbc8a5f 497 *p_bytes = 0; // make sure caller does not increase addr by one
davervw 0:90de1cbc8a5f 498 *p_addr = (ushort)((hi << 8) | lo);
davervw 0:90de1cbc8a5f 499 }
davervw 0:90de1cbc8a5f 500
davervw 0:90de1cbc8a5f 501 static void JMP(ushort *p_addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 502 {
davervw 0:90de1cbc8a5f 503 *p_bytes = 0; // caller should not advance address
davervw 0:90de1cbc8a5f 504 ushort addr2 = (ushort)(GetMemory((ushort)(*p_addr + 1)) | (GetMemory((ushort)(*p_addr + 2)) << 8));
davervw 0:90de1cbc8a5f 505 *p_addr = addr2;
davervw 0:90de1cbc8a5f 506 }
davervw 0:90de1cbc8a5f 507
davervw 0:90de1cbc8a5f 508 static void JMPIND(ushort *p_addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 509 {
davervw 0:90de1cbc8a5f 510 *p_bytes = 0; // caller should not advance address
davervw 0:90de1cbc8a5f 511 ushort addr2 = (ushort)(GetMemory((ushort)(*p_addr + 1)) | (GetMemory((ushort)(*p_addr + 2)) << 8));
davervw 0:90de1cbc8a5f 512 ushort addr3;
davervw 0:90de1cbc8a5f 513 if ((addr2 & 0xFF) == 0xFF) // JMP($XXFF) won't go over page boundary
davervw 0:90de1cbc8a5f 514 addr3 = (ushort)(GetMemory(addr2) | (GetMemory((ushort)(addr2 - 0xFF)) << 8)); // 6502 "bug" - will use XXFF and XX00 as source of address
davervw 0:90de1cbc8a5f 515 else
davervw 0:90de1cbc8a5f 516 addr3 = (ushort)(GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8));
davervw 0:90de1cbc8a5f 517 *p_addr = addr3;
davervw 0:90de1cbc8a5f 518 }
davervw 0:90de1cbc8a5f 519
davervw 0:90de1cbc8a5f 520 // "A:FF X:FF Y:FF S:FF P:XX-XXXXX"
davervw 0:90de1cbc8a5f 521 static void GetDisplayState(char *state, int state_size)
davervw 0:90de1cbc8a5f 522 {
davervw 0:90de1cbc8a5f 523 snprintf(state, state_size, "A:%02X X:%02X Y:%02X S:%02X P:%c%c-%c%c%c%c%c",
davervw 0:90de1cbc8a5f 524 A,
davervw 0:90de1cbc8a5f 525 X,
davervw 0:90de1cbc8a5f 526 Y,
davervw 0:90de1cbc8a5f 527 S,
davervw 0:90de1cbc8a5f 528 N ? 'N' : ' ',
davervw 0:90de1cbc8a5f 529 V ? 'V' : ' ',
davervw 0:90de1cbc8a5f 530 B ? 'B' : ' ',
davervw 0:90de1cbc8a5f 531 D ? 'D' : ' ',
davervw 0:90de1cbc8a5f 532 I ? 'I' : ' ',
davervw 0:90de1cbc8a5f 533 Z ? 'Z' : ' ',
davervw 0:90de1cbc8a5f 534 C ? 'C' : ' '
davervw 0:90de1cbc8a5f 535 );
davervw 0:90de1cbc8a5f 536 }
davervw 0:90de1cbc8a5f 537
davervw 0:90de1cbc8a5f 538 static byte GetIndX(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 539 {
davervw 0:90de1cbc8a5f 540 *p_bytes = 2;
davervw 0:90de1cbc8a5f 541 ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) + X);
davervw 0:90de1cbc8a5f 542 return GetMemory((ushort)(GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8)));
davervw 0:90de1cbc8a5f 543 }
davervw 0:90de1cbc8a5f 544
davervw 0:90de1cbc8a5f 545 static void SetIndX(byte value, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 546 {
davervw 0:90de1cbc8a5f 547 *p_bytes = 2;
davervw 0:90de1cbc8a5f 548 ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) + X);
davervw 0:90de1cbc8a5f 549 ushort addr3 = (ushort)(GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8));
davervw 0:90de1cbc8a5f 550 SetMemory(addr3, value);
davervw 0:90de1cbc8a5f 551 }
davervw 0:90de1cbc8a5f 552
davervw 0:90de1cbc8a5f 553 static byte GetIndY(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 554 {
davervw 0:90de1cbc8a5f 555 *p_bytes = 2;
davervw 0:90de1cbc8a5f 556 ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)));
davervw 0:90de1cbc8a5f 557 ushort addr3 = (ushort)((GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8)) + Y);
davervw 0:90de1cbc8a5f 558 return GetMemory(addr3);
davervw 0:90de1cbc8a5f 559 }
davervw 0:90de1cbc8a5f 560
davervw 0:90de1cbc8a5f 561 static void SetIndY(byte value, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 562 {
davervw 0:90de1cbc8a5f 563 *p_bytes = 2;
davervw 0:90de1cbc8a5f 564 ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)));
davervw 0:90de1cbc8a5f 565 ushort addr3 = (ushort)((GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8)) + Y);
davervw 0:90de1cbc8a5f 566 SetMemory(addr3, value);
davervw 0:90de1cbc8a5f 567 }
davervw 0:90de1cbc8a5f 568
davervw 0:90de1cbc8a5f 569 static byte GetZP(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 570 {
davervw 0:90de1cbc8a5f 571 *p_bytes = 2;
davervw 0:90de1cbc8a5f 572 ushort addr2 = GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 573 return GetMemory(addr2);
davervw 0:90de1cbc8a5f 574 }
davervw 0:90de1cbc8a5f 575
davervw 0:90de1cbc8a5f 576 static void SetZP(byte value, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 577 {
davervw 0:90de1cbc8a5f 578 *p_bytes = 2;
davervw 0:90de1cbc8a5f 579 ushort addr2 = GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 580 SetMemory(addr2, value);
davervw 0:90de1cbc8a5f 581 }
davervw 0:90de1cbc8a5f 582
davervw 0:90de1cbc8a5f 583 static byte GetZPX(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 584 {
davervw 0:90de1cbc8a5f 585 *p_bytes = 2;
davervw 0:90de1cbc8a5f 586 ushort addr2 = GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 587 return GetMemory((byte)(addr2 + X));
davervw 0:90de1cbc8a5f 588 }
davervw 0:90de1cbc8a5f 589
davervw 0:90de1cbc8a5f 590 static void SetZPX(byte value, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 591 {
davervw 0:90de1cbc8a5f 592 *p_bytes = 2;
davervw 0:90de1cbc8a5f 593 ushort addr2 = GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 594 SetMemory((byte)(addr2 + X), value);
davervw 0:90de1cbc8a5f 595 }
davervw 0:90de1cbc8a5f 596
davervw 0:90de1cbc8a5f 597 static byte GetZPY(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 598 {
davervw 0:90de1cbc8a5f 599 *p_bytes = 2;
davervw 0:90de1cbc8a5f 600 ushort addr2 = GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 601 return GetMemory((byte)(addr2 + Y));
davervw 0:90de1cbc8a5f 602 }
davervw 0:90de1cbc8a5f 603
davervw 0:90de1cbc8a5f 604 static void SetZPY(byte value, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 605 {
davervw 0:90de1cbc8a5f 606 *p_bytes = 2;
davervw 0:90de1cbc8a5f 607 ushort addr2 = GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 608 SetMemory((byte)(addr2 + Y), value);
davervw 0:90de1cbc8a5f 609 }
davervw 0:90de1cbc8a5f 610
davervw 0:90de1cbc8a5f 611 static byte GetABS(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 612 {
davervw 0:90de1cbc8a5f 613 *p_bytes = 3;
davervw 0:90de1cbc8a5f 614 ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 615 return GetMemory(addr2);
davervw 0:90de1cbc8a5f 616 }
davervw 0:90de1cbc8a5f 617
davervw 0:90de1cbc8a5f 618 static void SetABS(byte value, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 619 {
davervw 0:90de1cbc8a5f 620 *p_bytes = 3;
davervw 0:90de1cbc8a5f 621 ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 622 SetMemory(addr2, value);
davervw 0:90de1cbc8a5f 623 }
davervw 0:90de1cbc8a5f 624
davervw 0:90de1cbc8a5f 625 static byte GetABSX(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 626 {
davervw 0:90de1cbc8a5f 627 *p_bytes = 3;
davervw 0:90de1cbc8a5f 628 ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 629 return GetMemory((ushort)(addr2 + X));
davervw 0:90de1cbc8a5f 630 }
davervw 0:90de1cbc8a5f 631
davervw 0:90de1cbc8a5f 632 static void SetABSX(byte value, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 633 {
davervw 0:90de1cbc8a5f 634 *p_bytes = 3;
davervw 0:90de1cbc8a5f 635 ushort addr2 = (ushort)((GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8)) + X);
davervw 0:90de1cbc8a5f 636 SetMemory(addr2, value);
davervw 0:90de1cbc8a5f 637 }
davervw 0:90de1cbc8a5f 638
davervw 0:90de1cbc8a5f 639 static byte GetABSY(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 640 {
davervw 0:90de1cbc8a5f 641 *p_bytes = 3;
davervw 0:90de1cbc8a5f 642 ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 643 return GetMemory((ushort)(addr2 + Y));
davervw 0:90de1cbc8a5f 644 }
davervw 0:90de1cbc8a5f 645
davervw 0:90de1cbc8a5f 646 static void SetABSY(byte value, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 647 {
davervw 0:90de1cbc8a5f 648 *p_bytes = 3;
davervw 0:90de1cbc8a5f 649 ushort addr2 = (ushort)((GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8)) + Y);
davervw 0:90de1cbc8a5f 650 SetMemory(addr2, value);
davervw 0:90de1cbc8a5f 651 }
davervw 0:90de1cbc8a5f 652
davervw 0:90de1cbc8a5f 653 static byte GetIM(ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 654 {
davervw 0:90de1cbc8a5f 655 *p_bytes = 2;
davervw 0:90de1cbc8a5f 656 return GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 657 }
davervw 0:90de1cbc8a5f 658
davervw 0:90de1cbc8a5f 659 extern void Execute(ushort addr, bool (*ExecutePatch)(void))
davervw 0:90de1cbc8a5f 660 {
davervw 0:90de1cbc8a5f 661 bool conditional;
davervw 0:90de1cbc8a5f 662 byte bytes;
davervw 0:90de1cbc8a5f 663
davervw 4:0461c100cbbb 664 #if (USE_IRQ == 1)
davervw 4:0461c100cbbb 665 // IRQ support
davervw 4:0461c100cbbb 666 Timer timer;
davervw 4:0461c100cbbb 667 const double interrupt_time = 1.0 / 60.0 ; // 60 times per second
davervw 4:0461c100cbbb 668 timer.start();
davervw 4:0461c100cbbb 669 double timer_then = timer.read();
davervw 4:0461c100cbbb 670 #endif
davervw 4:0461c100cbbb 671
davervw 0:90de1cbc8a5f 672 PC = addr;
davervw 0:90de1cbc8a5f 673
davervw 0:90de1cbc8a5f 674 while (true)
davervw 0:90de1cbc8a5f 675 {
davervw 0:90de1cbc8a5f 676 while (true)
davervw 0:90de1cbc8a5f 677 {
davervw 4:0461c100cbbb 678 #if (USE_IRQ == 1)
davervw 4:0461c100cbbb 679 if (!I && (timer.read()-timer_then) >= interrupt_time) // IRQ
davervw 4:0461c100cbbb 680 {
davervw 4:0461c100cbbb 681 timer_then = timer.read(); // reset timer
davervw 4:0461c100cbbb 682 Push(HI(PC));
davervw 4:0461c100cbbb 683 Push(LO(PC));
davervw 4:0461c100cbbb 684 PHP();
davervw 4:0461c100cbbb 685 I = true;
davervw 4:0461c100cbbb 686 PC = (GetMemory(0xfffe) | (GetMemory(0xffff) << 8));
davervw 4:0461c100cbbb 687 }
davervw 4:0461c100cbbb 688 else
davervw 4:0461c100cbbb 689 #endif
davervw 0:90de1cbc8a5f 690 {
davervw 4:0461c100cbbb 691 bytes = 1;
davervw 4:0461c100cbbb 692 bool breakpoint = false;
davervw 4:0461c100cbbb 693 //if (Breakpoints.Contains(PC))
davervw 4:0461c100cbbb 694 // breakpoint = true;
davervw 4:0461c100cbbb 695 if (trace || breakpoint || step)
davervw 4:0461c100cbbb 696 {
davervw 4:0461c100cbbb 697 ushort addr2;
davervw 4:0461c100cbbb 698 char line[27];
davervw 4:0461c100cbbb 699 char dis[13];
davervw 4:0461c100cbbb 700 DisassembleLong(PC, &conditional, &bytes, &addr2, dis, sizeof(dis), line, sizeof(line));
davervw 4:0461c100cbbb 701 char state[33];
davervw 4:0461c100cbbb 702 GetDisplayState(state, sizeof(state));
davervw 4:0461c100cbbb 703 char full_line[80];
davervw 4:0461c100cbbb 704 snprintf(full_line, sizeof(full_line), "%-30s%s\n", line, state);
davervw 4:0461c100cbbb 705 #ifdef WIN32
davervw 4:0461c100cbbb 706 OutputDebugStringA(full_line);
davervw 4:0461c100cbbb 707 #else
davervw 4:0461c100cbbb 708 pc.printf("%s", full_line);
davervw 4:0461c100cbbb 709 #endif
davervw 4:0461c100cbbb 710 if (step)
davervw 4:0461c100cbbb 711 step = step; // user can put debug breakpoint here to allow stepping
davervw 4:0461c100cbbb 712 if (breakpoint)
davervw 4:0461c100cbbb 713 breakpoint = breakpoint; // user can put debug breakpoint here to allow break
davervw 4:0461c100cbbb 714 }
davervw 4:0461c100cbbb 715 if (ExecutePatch != 0 && !ExecutePatch()) // allow execute to be overriden at a specific address
davervw 4:0461c100cbbb 716 break;
davervw 0:90de1cbc8a5f 717 }
davervw 0:90de1cbc8a5f 718 }
davervw 0:90de1cbc8a5f 719
davervw 0:90de1cbc8a5f 720 switch (GetMemory(PC))
davervw 0:90de1cbc8a5f 721 {
davervw 0:90de1cbc8a5f 722 case 0x00: BRK(&bytes); break;
davervw 0:90de1cbc8a5f 723 case 0x01: ORA(GetIndX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 724 case 0x05: ORA(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 725 case 0x06: SetZP(ASL(GetZP(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 726 case 0x08: PHP(); break;
davervw 0:90de1cbc8a5f 727 case 0x09: ORA(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 728 case 0x0A: SetA(ASL(A)); break;
davervw 0:90de1cbc8a5f 729 case 0x0D: ORA(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 730 case 0x0E: SetABS(ASL(GetABS(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 731
davervw 0:90de1cbc8a5f 732 case 0x10: BPL(&PC, &conditional, &bytes); break;
davervw 0:90de1cbc8a5f 733 case 0x11: ORA(GetIndY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 734 case 0x15: ORA(GetZPX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 735 case 0x16: SetZPX(ASL(GetZPX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 736 case 0x18: CLC(); break;
davervw 0:90de1cbc8a5f 737 case 0x19: ORA(GetABSY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 738 case 0x1D: ORA(GetABSX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 739 case 0x1E: SetABSX(ASL(GetABSX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 740
davervw 0:90de1cbc8a5f 741 case 0x20: JSR(&PC, &bytes); break;
davervw 0:90de1cbc8a5f 742 case 0x21: AND(GetIndX(PC, &bytes)); break;
davervw 4:0461c100cbbb 743 case 0x24: BIT_OP(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 744 case 0x25: AND(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 745 case 0x26: SetZP(ROL(GetZP(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 746 case 0x28: PLP(); break;
davervw 0:90de1cbc8a5f 747 case 0x29: AND(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 748 case 0x2A: SetA(ROL(A)); break;
davervw 4:0461c100cbbb 749 case 0x2C: BIT_OP(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 750 case 0x2D: AND(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 751 case 0x2E: ROL(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 752
davervw 0:90de1cbc8a5f 753 case 0x30: BMI(&PC, &conditional, &bytes); break;
davervw 0:90de1cbc8a5f 754 case 0x31: AND(GetIndY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 755 case 0x35: AND(GetZPX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 756 case 0x36: SetZPX(ROL(GetZPX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 757 case 0x38: SEC(); break;
davervw 0:90de1cbc8a5f 758 case 0x39: AND(GetABSY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 759 case 0x3D: AND(GetABSX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 760 case 0x3E: SetABSX(ROL(GetABSX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 761
davervw 0:90de1cbc8a5f 762 case 0x40: RTI(&PC, &bytes); break;
davervw 0:90de1cbc8a5f 763 case 0x41: EOR(GetIndX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 764 case 0x45: EOR(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 765 case 0x46: SetZP(LSR(GetZP(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 766 case 0x48: PHA(); break;
davervw 0:90de1cbc8a5f 767 case 0x49: EOR(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 768 case 0x4A: SetA(LSR(A)); break;
davervw 0:90de1cbc8a5f 769 case 0x4C: JMP(&PC, &bytes); break;
davervw 0:90de1cbc8a5f 770 case 0x4D: EOR(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 771 case 0x4E: LSR(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 772
davervw 0:90de1cbc8a5f 773 case 0x50: BVC(&PC, &conditional, &bytes); break;
davervw 0:90de1cbc8a5f 774 case 0x51: EOR(GetIndY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 775 case 0x55: EOR(GetZPX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 776 case 0x56: SetZPX(LSR(GetZPX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 777 case 0x58: CLI(); break;
davervw 0:90de1cbc8a5f 778 case 0x59: EOR(GetABSY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 779 case 0x5D: EOR(GetABSX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 780 case 0x5E: SetABSX(LSR(GetABSX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 781
davervw 0:90de1cbc8a5f 782 case 0x60: RTS(&PC, &bytes); break;
davervw 4:0461c100cbbb 783 case 0x61: ADC_OP(GetIndX(PC, &bytes)); break;
davervw 4:0461c100cbbb 784 case 0x65: ADC_OP(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 785 case 0x66: SetZP(ROR(GetZP(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 786 case 0x68: PLA(); break;
davervw 4:0461c100cbbb 787 case 0x69: ADC_OP(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 788 case 0x6A: SetA(ROR(A)); break;
davervw 0:90de1cbc8a5f 789 case 0x6C: JMPIND(&PC, &bytes); break;
davervw 4:0461c100cbbb 790 case 0x6D: ADC_OP(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 791 case 0x6E: SetABS(ROR(GetABS(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 792
davervw 0:90de1cbc8a5f 793 case 0x70: BVS(&PC, &conditional, &bytes); break;
davervw 4:0461c100cbbb 794 case 0x71: ADC_OP(GetIndY(PC, &bytes)); break;
davervw 4:0461c100cbbb 795 case 0x75: ADC_OP(GetZPX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 796 case 0x76: SetZPX(ROR(GetZPX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 797 case 0x78: SEI(); break;
davervw 4:0461c100cbbb 798 case 0x79: ADC_OP(GetABSY(PC, &bytes)); break;
davervw 4:0461c100cbbb 799 case 0x7D: ADC_OP(GetABSX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 800 case 0x7E: SetABSX(ROR(GetABSX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 801
davervw 0:90de1cbc8a5f 802 case 0x81: SetIndX(A, PC, &bytes); break;
davervw 0:90de1cbc8a5f 803 case 0x84: SetZP(Y, PC, &bytes); break;
davervw 0:90de1cbc8a5f 804 case 0x85: SetZP(A, PC, &bytes); break;
davervw 0:90de1cbc8a5f 805 case 0x86: SetZP(X, PC, &bytes); break;
davervw 0:90de1cbc8a5f 806 case 0x88: DEY(); break;
davervw 0:90de1cbc8a5f 807 case 0x8A: TXA(); break;
davervw 0:90de1cbc8a5f 808 case 0x8C: SetABS(Y, PC, &bytes); break;
davervw 0:90de1cbc8a5f 809 case 0x8D: SetABS(A, PC, &bytes); break;
davervw 0:90de1cbc8a5f 810 case 0x8E: SetABS(X, PC, &bytes); break;
davervw 0:90de1cbc8a5f 811
davervw 0:90de1cbc8a5f 812 case 0x90: BCC(&PC, &conditional, &bytes); break;
davervw 0:90de1cbc8a5f 813 case 0x91: SetIndY(A, PC, &bytes); break;
davervw 0:90de1cbc8a5f 814 case 0x94: SetZPX(Y, PC, &bytes); break;
davervw 0:90de1cbc8a5f 815 case 0x95: SetZPX(A, PC, &bytes); break;
davervw 0:90de1cbc8a5f 816 case 0x96: SetZPY(X, PC, &bytes); break;
davervw 0:90de1cbc8a5f 817 case 0x98: TYA(); break;
davervw 0:90de1cbc8a5f 818 case 0x99: SetABSY(A, PC, &bytes); break;
davervw 0:90de1cbc8a5f 819 case 0x9A: TXS(); break;
davervw 0:90de1cbc8a5f 820 case 0x9D: SetABSX(A, PC, &bytes); break;
davervw 0:90de1cbc8a5f 821
davervw 0:90de1cbc8a5f 822 case 0xA0: SetY(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 823 case 0xA1: SetA(GetIndX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 824 case 0xA2: SetX(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 825 case 0xA4: SetY(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 826 case 0xA5: SetA(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 827 case 0xA6: SetX(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 828 case 0xA8: TAY(); break;
davervw 0:90de1cbc8a5f 829 case 0xA9: SetA(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 830 case 0xAA: TAX(); break;
davervw 0:90de1cbc8a5f 831 case 0xAC: SetY(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 832 case 0xAD: SetA(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 833 case 0xAE: SetX(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 834
davervw 0:90de1cbc8a5f 835 case 0xB0: BCS(&PC, &conditional, &bytes); break;
davervw 0:90de1cbc8a5f 836 case 0xB1: SetA(GetIndY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 837 case 0xB4: SetY(GetZPX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 838 case 0xB5: SetA(GetZPX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 839 case 0xB6: SetX(GetZPY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 840 case 0xB8: CLV(); break;
davervw 0:90de1cbc8a5f 841 case 0xB9: SetA(GetABSY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 842 case 0xBA: TSX(); break;
davervw 0:90de1cbc8a5f 843 case 0xBC: SetY(GetABSX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 844 case 0xBD: SetA(GetABSX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 845 case 0xBE: SetX(GetABSY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 846
davervw 0:90de1cbc8a5f 847 case 0xC0: CPY(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 848 case 0xC1: CMP(GetIndX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 849 case 0xC4: CPY(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 850 case 0xC5: CMP(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 851 case 0xC6: SetZP(DEC(GetZP(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 852 case 0xC8: INY(); break;
davervw 0:90de1cbc8a5f 853 case 0xC9: CMP(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 854 case 0xCA: DEX(); break;
davervw 0:90de1cbc8a5f 855 case 0xCC: CPY(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 856 case 0xCD: CMP(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 857 case 0xCE: SetABS(DEC(GetABS(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 858
davervw 0:90de1cbc8a5f 859 case 0xD0: BNE(&PC, &conditional, &bytes); break;
davervw 0:90de1cbc8a5f 860 case 0xD1: CMP(GetIndY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 861 case 0xD5: CMP(GetZPX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 862 case 0xD6: SetZPX(DEC(GetZPX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 863 case 0xD8: CLD(); break;
davervw 0:90de1cbc8a5f 864 case 0xD9: CMP(GetABSY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 865 case 0xDD: CMP(GetABSX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 866 case 0xDE: SetABSX(DEC(GetABSX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 867
davervw 0:90de1cbc8a5f 868 case 0xE0: CPX(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 869 case 0xE1: SBC(GetIndX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 870 case 0xE4: CPX(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 871 case 0xE5: SBC(GetZP(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 872 case 0xE6: SetZP(INC(GetZP(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 873 case 0xE8: INX(); break;
davervw 0:90de1cbc8a5f 874 case 0xE9: SBC(GetIM(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 875 case 0xEA: NOP(); break;
davervw 0:90de1cbc8a5f 876 case 0xEC: CPX(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 877 case 0xED: SBC(GetABS(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 878 case 0xEE: SetABS(INC(GetABS(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 879
davervw 0:90de1cbc8a5f 880 case 0xF0: BEQ(&PC, &conditional, &bytes); break;
davervw 0:90de1cbc8a5f 881 case 0xF1: SBC(GetIndY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 882 case 0xF5: SBC(GetZPX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 883 case 0xF6: SetZPX(INC(GetZPX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 884 case 0xF8: SED(); break;
davervw 0:90de1cbc8a5f 885 case 0xF9: SBC(GetABSY(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 886 case 0xFD: SBC(GetABSX(PC, &bytes)); break;
davervw 0:90de1cbc8a5f 887 case 0xFE: SetABSX(INC(GetABSX(PC, &bytes)), PC, &bytes); break;
davervw 0:90de1cbc8a5f 888
davervw 0:90de1cbc8a5f 889 default:
davervw 0:90de1cbc8a5f 890 {
davervw 0:90de1cbc8a5f 891 printf("Invalid opcode %02X at %04X", GetMemory(PC), PC);
davervw 0:90de1cbc8a5f 892 exit(1);
davervw 0:90de1cbc8a5f 893 }
davervw 0:90de1cbc8a5f 894 }
davervw 0:90de1cbc8a5f 895
davervw 0:90de1cbc8a5f 896 PC += bytes;
davervw 0:90de1cbc8a5f 897 }
davervw 0:90de1cbc8a5f 898 }
davervw 0:90de1cbc8a5f 899
davervw 0:90de1cbc8a5f 900 // Examples:
davervw 0:90de1cbc8a5f 901 // FFFF FF FF FF JMP ($FFFF)
davervw 0:90de1cbc8a5f 902 // FFFF FF FF FF LDA $FFFF,X
davervw 0:90de1cbc8a5f 903 extern void DisassembleLong(ushort addr, bool *p_conditional, byte *p_bytes, ushort *p_addr2, char *dis, int dis_size, char *line, int line_size)
davervw 0:90de1cbc8a5f 904 {
davervw 0:90de1cbc8a5f 905 DisassembleShort(addr, p_conditional, p_bytes, p_addr2, dis, dis_size);
davervw 0:90de1cbc8a5f 906 snprintf(line, line_size, "%04X ", addr);
davervw 0:90de1cbc8a5f 907 for (int i = 0; i < 3; ++i)
davervw 0:90de1cbc8a5f 908 {
davervw 0:90de1cbc8a5f 909 if (i < *p_bytes)
davervw 0:90de1cbc8a5f 910 snprintf(line+strlen(line), line_size-strlen(line), "%02X ", GetMemory((ushort)(addr + i)));
davervw 0:90de1cbc8a5f 911 else
davervw 0:90de1cbc8a5f 912 strcat_s(line, line_size, " ");
davervw 0:90de1cbc8a5f 913 }
davervw 0:90de1cbc8a5f 914 strcat_s(line, line_size, dis);
davervw 0:90de1cbc8a5f 915 }
davervw 0:90de1cbc8a5f 916
davervw 0:90de1cbc8a5f 917 static void Ind(char *dis, int dis_size, char* opcode, ushort addr, ushort *p_addr2, byte *p_bytes)
davervw 0:90de1cbc8a5f 918 {
davervw 0:90de1cbc8a5f 919 *p_bytes = 3;
davervw 0:90de1cbc8a5f 920 ushort addr1 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 921 *p_addr2 = (ushort)(GetMemory(addr1) | (GetMemory((ushort)(addr1 + 1)) << 8));
davervw 0:90de1cbc8a5f 922 snprintf(dis, dis_size, "%s ($%0X4)", opcode, addr1);
davervw 0:90de1cbc8a5f 923 }
davervw 0:90de1cbc8a5f 924
davervw 0:90de1cbc8a5f 925 static void IndX(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 926 {
davervw 0:90de1cbc8a5f 927 *p_bytes = 2;
davervw 0:90de1cbc8a5f 928 snprintf(dis, dis_size, "%s ($%02X,X)", opcode, GetMemory((ushort)(addr + 1)));
davervw 0:90de1cbc8a5f 929 }
davervw 0:90de1cbc8a5f 930
davervw 0:90de1cbc8a5f 931 static void IndY(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 932 {
davervw 0:90de1cbc8a5f 933 *p_bytes = 2;
davervw 0:90de1cbc8a5f 934 snprintf(dis, dis_size, "%s ($%02X),Y", opcode, GetMemory((ushort)(addr + 1)));
davervw 0:90de1cbc8a5f 935 }
davervw 0:90de1cbc8a5f 936
davervw 0:90de1cbc8a5f 937 static void ZP(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 938 {
davervw 0:90de1cbc8a5f 939 *p_bytes = 2;
davervw 0:90de1cbc8a5f 940 snprintf(dis, dis_size, "%s $%02X", opcode, GetMemory((ushort)(addr + 1)));
davervw 0:90de1cbc8a5f 941 }
davervw 0:90de1cbc8a5f 942
davervw 0:90de1cbc8a5f 943 static void ZPX(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 944 {
davervw 0:90de1cbc8a5f 945 *p_bytes = 2;
davervw 0:90de1cbc8a5f 946 snprintf(dis, dis_size, "%s $%02X,X", opcode, GetMemory((ushort)(addr + 1)));
davervw 0:90de1cbc8a5f 947 }
davervw 0:90de1cbc8a5f 948
davervw 0:90de1cbc8a5f 949 static void ZPY(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 950 {
davervw 0:90de1cbc8a5f 951 *p_bytes = 2;
davervw 0:90de1cbc8a5f 952 snprintf(dis, dis_size, "%s $%02X,Y", opcode, GetMemory((ushort)(addr + 1)));
davervw 0:90de1cbc8a5f 953 }
davervw 0:90de1cbc8a5f 954
davervw 0:90de1cbc8a5f 955 static void ABS(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 956 {
davervw 0:90de1cbc8a5f 957 *p_bytes = 3;
davervw 0:90de1cbc8a5f 958 snprintf(dis, dis_size, "%s $%04X", opcode, GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 959 }
davervw 0:90de1cbc8a5f 960
davervw 0:90de1cbc8a5f 961 static void ABSAddr(char *dis, int dis_size, char* opcode, ushort addr, ushort *p_addr2, byte *p_bytes)
davervw 0:90de1cbc8a5f 962 {
davervw 0:90de1cbc8a5f 963 *p_bytes = 3;
davervw 0:90de1cbc8a5f 964 *p_addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 965 snprintf(dis, dis_size, "%s $%04X", opcode, *p_addr2);
davervw 0:90de1cbc8a5f 966 }
davervw 0:90de1cbc8a5f 967
davervw 0:90de1cbc8a5f 968 static void ABSX(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 969 {
davervw 0:90de1cbc8a5f 970 *p_bytes = 3;
davervw 0:90de1cbc8a5f 971 snprintf(dis, dis_size, "%s $%04X,X", opcode, GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 972 }
davervw 0:90de1cbc8a5f 973
davervw 0:90de1cbc8a5f 974 static void ABSY(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 975 {
davervw 0:90de1cbc8a5f 976 *p_bytes = 3;
davervw 0:90de1cbc8a5f 977 snprintf(dis, dis_size, "%s $%04X,Y", opcode, GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
davervw 0:90de1cbc8a5f 978 }
davervw 0:90de1cbc8a5f 979
davervw 0:90de1cbc8a5f 980 static void IM(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
davervw 0:90de1cbc8a5f 981 {
davervw 0:90de1cbc8a5f 982 *p_bytes = 2;
davervw 0:90de1cbc8a5f 983 snprintf(dis, dis_size, "%s #$%02X", opcode, GetMemory((ushort)(addr + 1)));
davervw 0:90de1cbc8a5f 984 }
davervw 0:90de1cbc8a5f 985
davervw 0:90de1cbc8a5f 986 static void BRX(char *dis, int dis_size, char* opcode, ushort addr, bool *p_conditional, ushort *p_addr2, byte *p_bytes)
davervw 0:90de1cbc8a5f 987 {
davervw 0:90de1cbc8a5f 988 *p_bytes = 2;
davervw 0:90de1cbc8a5f 989 *p_conditional = true;
davervw 0:90de1cbc8a5f 990 sbyte offset = (sbyte)GetMemory((ushort)(addr + 1));
davervw 0:90de1cbc8a5f 991 *p_addr2 = (ushort)(addr + 2 + offset);
davervw 0:90de1cbc8a5f 992 snprintf(dis, dis_size, "%s $%04X", opcode, *p_addr2);
davervw 0:90de1cbc8a5f 993 }
davervw 0:90de1cbc8a5f 994
davervw 0:90de1cbc8a5f 995 // JMP ($FFFF)
davervw 0:90de1cbc8a5f 996 // LDA $FFFF,X
davervw 0:90de1cbc8a5f 997 extern void DisassembleShort(ushort addr, bool *p_conditional, byte *p_bytes, ushort *p_addr2, char *dis, int dis_size)
davervw 0:90de1cbc8a5f 998 {
davervw 0:90de1cbc8a5f 999 *p_conditional = false;
davervw 0:90de1cbc8a5f 1000 *p_addr2 = 0;
davervw 0:90de1cbc8a5f 1001 *p_bytes = 1;
davervw 0:90de1cbc8a5f 1002
davervw 0:90de1cbc8a5f 1003 switch (GetMemory(addr))
davervw 0:90de1cbc8a5f 1004 {
davervw 0:90de1cbc8a5f 1005 case 0x00: strcpy_s(dis, dis_size, "BRK"); return;
davervw 0:90de1cbc8a5f 1006 case 0x01: IndX(dis, dis_size, "ORA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1007 case 0x05: ZP(dis, dis_size, "ORA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1008 case 0x06: ZP(dis, dis_size, "ASL", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1009 case 0x08: strcpy_s(dis, dis_size, "PHP"); return;
davervw 0:90de1cbc8a5f 1010 case 0x09: IM(dis, dis_size, "ORA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1011 case 0x0A: strcpy_s(dis, dis_size, "ASL A"); return;
davervw 0:90de1cbc8a5f 1012 case 0x0D: ABS(dis, dis_size, "ORA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1013 case 0x0E: ABS(dis, dis_size, "ASL", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1014
davervw 0:90de1cbc8a5f 1015 case 0x10: BRX(dis, dis_size, "BPL", addr, p_conditional, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1016 case 0x11: IndY(dis, dis_size, "ORA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1017 case 0x15: ZPX(dis, dis_size, "ORA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1018 case 0x16: ZPX(dis, dis_size, "ASL", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1019 case 0x18: strcpy_s(dis, dis_size, "CLC"); return;
davervw 0:90de1cbc8a5f 1020 case 0x19: ABSY(dis, dis_size, "ORA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1021 case 0x1D: ABSX(dis, dis_size, "ORA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1022 case 0x1E: ABSX(dis, dis_size, "ASL", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1023
davervw 0:90de1cbc8a5f 1024 case 0x20: ABSAddr(dis, dis_size, "JSR", addr, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1025 case 0x21: IndX(dis, dis_size, "AND", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1026 case 0x24: ZP(dis, dis_size, "BIT", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1027 case 0x25: ZP(dis, dis_size, "AND", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1028 case 0x26: ZP(dis, dis_size, "ROL", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1029 case 0x28: strcpy_s(dis, dis_size, "PLP"); return;
davervw 0:90de1cbc8a5f 1030 case 0x29: IM(dis, dis_size, "AND", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1031 case 0x2A: strcpy_s(dis, dis_size, "ROL A"); return;
davervw 0:90de1cbc8a5f 1032 case 0x2C: ABS(dis, dis_size, "BIT", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1033 case 0x2D: ABS(dis, dis_size, "AND", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1034 case 0x2E: ABS(dis, dis_size, "ROL", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1035
davervw 0:90de1cbc8a5f 1036 case 0x30: BRX(dis, dis_size, "BMI", addr, p_conditional, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1037 case 0x31: IndY(dis, dis_size, "AND", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1038 case 0x35: ZPX(dis, dis_size, "AND", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1039 case 0x36: ZPX(dis, dis_size, "ROL", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1040 case 0x38: strcpy_s(dis, dis_size, "SEC"); return;
davervw 0:90de1cbc8a5f 1041 case 0x39: ABSY(dis, dis_size, "AND", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1042 case 0x3D: ABSX(dis, dis_size, "AND", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1043 case 0x3E: ABSX(dis, dis_size, "ROL", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1044
davervw 0:90de1cbc8a5f 1045 case 0x40: strcpy_s(dis, dis_size, "RTI"); return;
davervw 0:90de1cbc8a5f 1046 case 0x41: IndX(dis, dis_size, "EOR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1047 case 0x45: ZP(dis, dis_size, "EOR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1048 case 0x46: ZP(dis, dis_size, "LSR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1049 case 0x48: strcpy_s(dis, dis_size, "PHA"); return;
davervw 0:90de1cbc8a5f 1050 case 0x49: IM(dis, dis_size, "EOR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1051 case 0x4A: strcpy_s(dis, dis_size, "LSR A"); return;
davervw 0:90de1cbc8a5f 1052 case 0x4C: ABSAddr(dis, dis_size, "JMP", addr, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1053 case 0x4D: ABS(dis, dis_size, "EOR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1054 case 0x4E: ABS(dis, dis_size, "LSR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1055
davervw 0:90de1cbc8a5f 1056 case 0x50: BRX(dis, dis_size, "BVC", addr, p_conditional, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1057 case 0x51: IndY(dis, dis_size, "EOR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1058 case 0x55: ZPX(dis, dis_size, "EOR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1059 case 0x56: ZPX(dis, dis_size, "LSR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1060 case 0x58: strcpy_s(dis, dis_size, "CLI"); return;
davervw 0:90de1cbc8a5f 1061 case 0x59: ABSY(dis, dis_size, "EOR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1062 case 0x5D: ABSX(dis, dis_size, "EOR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1063 case 0x5E: ABSX(dis, dis_size, "LSR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1064
davervw 0:90de1cbc8a5f 1065 case 0x60: strcpy_s(dis, dis_size, "RTS"); return;
davervw 0:90de1cbc8a5f 1066 case 0x61: IndX(dis, dis_size, "ADC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1067 case 0x65: ZP(dis, dis_size, "ADC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1068 case 0x66: ZP(dis, dis_size, "ROR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1069 case 0x68: strcpy_s(dis, dis_size, "PLA"); return;
davervw 0:90de1cbc8a5f 1070 case 0x69: IM(dis, dis_size, "ADC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1071 case 0x6A: strcpy_s(dis, dis_size, "ROR A"); return;
davervw 0:90de1cbc8a5f 1072 case 0x6C: Ind(dis, dis_size, "JMP", addr, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1073 case 0x6D: ABS(dis, dis_size, "ADC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1074 case 0x6E: ABS(dis, dis_size, "ROR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1075
davervw 0:90de1cbc8a5f 1076 case 0x70: BRX(dis, dis_size, "BVS", addr, p_conditional, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1077 case 0x71: IndY(dis, dis_size, "ADC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1078 case 0x75: ZPX(dis, dis_size, "ADC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1079 case 0x76: ZPX(dis, dis_size, "ROR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1080 case 0x78: strcpy_s(dis, dis_size, "SEI"); return;
davervw 0:90de1cbc8a5f 1081 case 0x79: ABSY(dis, dis_size, "ADC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1082 case 0x7D: ABSX(dis, dis_size, "ADC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1083 case 0x7E: ABSX(dis, dis_size, "ROR", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1084
davervw 0:90de1cbc8a5f 1085 case 0x81: IndX(dis, dis_size, "STA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1086 case 0x84: ZP(dis, dis_size, "STY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1087 case 0x85: ZP(dis, dis_size, "STA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1088 case 0x86: ZP(dis, dis_size, "STX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1089 case 0x88: strcpy_s(dis, dis_size, "DEY"); return;
davervw 0:90de1cbc8a5f 1090 case 0x8A: strcpy_s(dis, dis_size, "TXA"); return;
davervw 0:90de1cbc8a5f 1091 case 0x8C: ABS(dis, dis_size, "STY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1092 case 0x8D: ABS(dis, dis_size, "STA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1093 case 0x8E: ABS(dis, dis_size, "STX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1094
davervw 0:90de1cbc8a5f 1095 case 0x90: BRX(dis, dis_size, "BCC", addr, p_conditional, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1096 case 0x91: IndY(dis, dis_size, "STA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1097 case 0x94: ZPX(dis, dis_size, "STY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1098 case 0x95: ZPX(dis, dis_size, "STA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1099 case 0x96: ZPY(dis, dis_size, "STX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1100 case 0x98: strcpy_s(dis, dis_size, "TYA"); return;
davervw 0:90de1cbc8a5f 1101 case 0x99: ABSY(dis, dis_size, "STA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1102 case 0x9A: strcpy_s(dis, dis_size, "TXS"); return;
davervw 0:90de1cbc8a5f 1103 case 0x9D: ABSX(dis, dis_size, "STA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1104
davervw 0:90de1cbc8a5f 1105 case 0xA0: IM(dis, dis_size, "LDY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1106 case 0xA1: IndX(dis, dis_size, "LDA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1107 case 0xA2: IM(dis, dis_size, "LDX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1108 case 0xA4: ZP(dis, dis_size, "LDY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1109 case 0xA5: ZP(dis, dis_size, "LDA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1110 case 0xA6: ZP(dis, dis_size, "LDX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1111 case 0xA8: strcpy_s(dis, dis_size, "TAY"); return;
davervw 0:90de1cbc8a5f 1112 case 0xA9: IM(dis, dis_size, "LDA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1113 case 0xAA: strcpy_s(dis, dis_size, "TAX"); return;
davervw 0:90de1cbc8a5f 1114 case 0xAC: ABS(dis, dis_size, "LDY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1115 case 0xAD: ABS(dis, dis_size, "LDA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1116 case 0xAE: ABS(dis, dis_size, "LDX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1117
davervw 0:90de1cbc8a5f 1118 case 0xB0: BRX(dis, dis_size, "BCS", addr, p_conditional, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1119 case 0xB1: IndY(dis, dis_size, "LDA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1120 case 0xB4: ZPX(dis, dis_size, "LDY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1121 case 0xB5: ZPX(dis, dis_size, "LDA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1122 case 0xB6: ZPY(dis, dis_size, "LDX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1123 case 0xB8: strcpy_s(dis, dis_size, "CLV"); return;
davervw 0:90de1cbc8a5f 1124 case 0xB9: ABSY(dis, dis_size, "LDA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1125 case 0xBA: strcpy_s(dis, dis_size, "TSX"); return;
davervw 0:90de1cbc8a5f 1126 case 0xBC: ABSX(dis, dis_size, "LDY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1127 case 0xBD: ABSX(dis, dis_size, "LDA", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1128 case 0xBE: ABSY(dis, dis_size, "LDX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1129
davervw 0:90de1cbc8a5f 1130 case 0xC0: IM(dis, dis_size, "CPY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1131 case 0xC1: IndX(dis, dis_size, "CMP", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1132 case 0xC4: ZP(dis, dis_size, "CPY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1133 case 0xC5: ZP(dis, dis_size, "CMP", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1134 case 0xC6: ZP(dis, dis_size, "DEC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1135 case 0xC8: strcpy_s(dis, dis_size, "INY"); return;
davervw 0:90de1cbc8a5f 1136 case 0xC9: IM(dis, dis_size, "CMP", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1137 case 0xCA: strcpy_s(dis, dis_size, "DEX"); return;
davervw 0:90de1cbc8a5f 1138 case 0xCC: ABS(dis, dis_size, "CPY", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1139 case 0xCD: ABS(dis, dis_size, "CMP", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1140 case 0xCE: ABS(dis, dis_size, "DEC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1141
davervw 0:90de1cbc8a5f 1142 case 0xD0: BRX(dis, dis_size, "BNE", addr, p_conditional, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1143 case 0xD1: IndY(dis, dis_size, "CMP", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1144 case 0xD5: ZPX(dis, dis_size, "CMP", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1145 case 0xD6: ZPX(dis, dis_size, "DEC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1146 case 0xD8: strcpy_s(dis, dis_size, "CLD"); return;
davervw 0:90de1cbc8a5f 1147 case 0xD9: ABSY(dis, dis_size, "CMP", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1148 case 0xDD: ABSX(dis, dis_size, "CMP", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1149 case 0xDE: ABSX(dis, dis_size, "DEC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1150
davervw 0:90de1cbc8a5f 1151 case 0xE0: IM(dis, dis_size, "CPX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1152 case 0xE1: IndX(dis, dis_size, "SBC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1153 case 0xE4: ZP(dis, dis_size, "CPX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1154 case 0xE5: ZP(dis, dis_size, "SBC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1155 case 0xE6: ZP(dis, dis_size, "INC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1156 case 0xE8: strcpy_s(dis, dis_size, "INX"); return;
davervw 0:90de1cbc8a5f 1157 case 0xE9: IM(dis, dis_size, "SBC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1158 case 0xEA: strcpy_s(dis, dis_size, "NOP"); return;
davervw 0:90de1cbc8a5f 1159 case 0xEC: ABS(dis, dis_size, "CPX", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1160 case 0xED: ABS(dis, dis_size, "SBC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1161 case 0xEE: ABS(dis, dis_size, "INC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1162
davervw 0:90de1cbc8a5f 1163 case 0xF0: BRX(dis, dis_size, "BEQ", addr, p_conditional, p_addr2, p_bytes); return;
davervw 0:90de1cbc8a5f 1164 case 0xF1: IndY(dis, dis_size, "SBC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1165 case 0xF5: ZPX(dis, dis_size, "SBC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1166 case 0xF6: ZPX(dis, dis_size, "INC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1167 case 0xF8: strcpy_s(dis, dis_size, "SED"); return;
davervw 0:90de1cbc8a5f 1168 case 0xF9: ABSY(dis, dis_size, "SBC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1169 case 0xFD: ABSX(dis, dis_size, "SBC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1170 case 0xFE: ABSX(dis, dis_size, "INC", addr, p_bytes); return;
davervw 0:90de1cbc8a5f 1171
davervw 0:90de1cbc8a5f 1172 default:
davervw 0:90de1cbc8a5f 1173 strcpy_s(dis, dis_size, "???");
davervw 0:90de1cbc8a5f 1174 return;
davervw 0:90de1cbc8a5f 1175 //throw new Exception(string.Format("Invalid opcode {0:X2}", memory[addr]));
davervw 0:90de1cbc8a5f 1176 }
davervw 0:90de1cbc8a5f 1177 }