Dave Van Wagner
C64 emulation on STM32F429 Discovery board with builtin LCD and USB keyboard support (OTG). More info at davevw.com and/or github.com/davervw
Dependencies: LCD_DISCO_F429ZI BSP_DISCO_F429ZI USBHOST
Diff: emu6502.cpp
- Revision:
- 0:90de1cbc8a5f
- Child:
- 4:8476be802690
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/emu6502.cpp Thu Apr 09 14:45:56 2020 +0000
@@ -0,0 +1,1155 @@
+// emu6502.c - Emu6502 - MOS6502 Emulator
+//
+////////////////////////////////////////////////////////////////////////////////
+//
+// c-simple-emu-cbm (C Portable Version)
+// C64/6502 Emulator for Microsoft Windows Console
+//
+// MIT License
+//
+// Copyright(c) 2020 by David R.Van Wagner
+// davevw.com
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+//
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+//#define snprintf sprintf_s
+
+#include <mbed.h>
+#include "emu6502.h"
+
+// global references
+extern Serial pc;
+
+// globals
+byte A = 0;
+byte X = 0;
+byte Y = 0;
+byte S = 0xFF;
+bool N = false;
+bool V = false;
+bool B = false;
+bool D = false;
+bool I = false;
+bool Z = false;
+bool C = false;
+ushort PC = 0;
+bool trace = false;
+bool step = false;
+
+extern void ResetRun(bool (*ExecutePatch)(void))
+{
+ ushort addr = (ushort)((GetMemory(0xFFFC) | (GetMemory(0xFFFD) << 8))); // RESET vector
+ Execute(addr, ExecutePatch);
+}
+
+#ifndef WIN32
+static void strcpy_s(char* dest, size_t size, const char* src)
+{
+ strncpy(dest, src, size);
+}
+
+static void strcat_s(char* dest, size_t size, const char* src)
+{
+ strncat(dest, src, size);
+}
+#endif
+
+static void PHP()
+{
+ int flags = (N ? 0x80 : 0)
+ | (V ? 0x40 : 0)
+ | (B ? 0x10 : 0)
+ | (D ? 0x08 : 0)
+ | (I ? 0x04 : 0)
+ | (Z ? 0x02 : 0)
+ | (C ? 0x01 : 0);
+ Push(flags);
+}
+
+extern byte LO(ushort value)
+{
+ return (byte)value;
+}
+
+extern byte HI(ushort value)
+{
+ return (byte)(value >> 8);
+}
+
+static void BRK(byte *p_bytes)
+{
+ ++PC;
+ PHP();
+ Push(HI(PC));
+ Push(LO(PC));
+ B = true;
+ PC = (ushort)(GetMemory(0xFFFE) + (GetMemory(0xFFFF) << 8));
+ *p_bytes = 0;
+}
+
+static byte Subtract(byte reg, byte value, bool *p_overflow)
+{
+ bool old_reg_neg = (reg & 0x80) != 0;
+ bool value_neg = (value & 0x80) != 0;
+ int result = reg - value - (C ? 0 : 1);
+ N = (result & 0x80) != 0;
+ C = (result >= 0);
+ Z = (result == 0);
+ bool result_neg = (result & 0x80) != 0;
+ *p_overflow = (old_reg_neg && !value_neg && !result_neg) // neg - pos = pos
+ || (!old_reg_neg && value_neg && result_neg); // pos - neg = neg
+ return (byte)result;
+}
+
+static byte SubtractWithoutOverflow(byte reg, byte value)
+{
+ C = true; // init for CMP, etc.
+ bool unused;
+ return Subtract(reg, value, &unused);
+}
+
+static void CMP(byte value)
+{
+ SubtractWithoutOverflow(A, value);
+}
+
+static void CPX(byte value)
+{
+ SubtractWithoutOverflow(X, value);
+}
+
+static void CPY(byte value)
+{
+ SubtractWithoutOverflow(Y, value);
+}
+
+static void SetReg(byte *p_reg, int value)
+{
+ *p_reg = (byte)value;
+ Z = (*p_reg == 0);
+ N = ((*p_reg & 0x80) != 0);
+}
+
+static void SetA(int value)
+{
+ SetReg(&A, value);
+}
+
+static void SetX(int value)
+{
+ SetReg(&X, value);
+}
+
+static void SetY(int value)
+{
+ SetReg(&Y, value);
+}
+
+static void SBC(byte value)
+{
+ if (D)
+ {
+ int A_dec = (A & 0xF) + ((A >> 4) * 10);
+ int value_dec = (value & 0xF) + ((value >> 4) * 10);
+ int result_dec = A_dec - value_dec - (C ? 0 : 1);
+ C = (result_dec >= 0);
+ if (!C)
+ result_dec = -result_dec; // absolute value
+ int result = (result_dec % 10) | (((result_dec / 10) % 10) << 4);
+ SetA(result);
+ N = false; // undefined?
+ V = false; // undefined?
+ }
+ else
+ {
+ byte result = Subtract(A, value, &V);
+ SetA(result);
+ }
+}
+
+static void ADC(byte value)
+{
+ int result;
+ if (D)
+ {
+ int A_dec = (A & 0xF) + ((A >> 4) * 10);
+ int value_dec = (value & 0xF) + ((value >> 4) * 10);
+ int result_dec = A_dec + value_dec + (C ? 1 : 0);
+ C = (result_dec > 99);
+ result = (result_dec % 10) | (((result_dec / 10) % 10) << 4);
+ SetA(result);
+ Z = (result_dec == 0); // BCD quirk -- 100 doesn't set Z
+ V = false;
+ }
+ else
+ {
+ bool A_old_neg = (A & 0x80) != 0;
+ bool value_neg = (value & 0x80) != 0;
+ result = A + value + (C ? 1 : 0);
+ C = (result & 0x100) != 0;
+ SetA(result);
+ bool result_neg = (result & 0x80) != 0;
+ V = (!A_old_neg && !value_neg && result_neg) // pos + pos = neg: overflow
+ || (A_old_neg && value_neg && !result_neg); // neg + neg = pos: overflow
+ }
+}
+
+static void ORA(int value)
+{
+ SetA(A | value);
+}
+
+static void EOR(int value)
+{
+ SetA(A ^ value);
+}
+
+static void AND(int value)
+{
+ SetA(A & value);
+}
+
+static void BIT(byte value)
+{
+ Z = (A & value) == 0;
+ N = (value & 0x80) != 0;
+ V = (value & 0x40) != 0;
+}
+
+static byte ASL(int value)
+{
+ C = (value & 0x80) != 0;
+ value = (byte)(value << 1);
+ Z = (value == 0);
+ N = (value & 0x80) != 0;
+ return (byte)value;
+}
+
+static byte LSR(int value)
+{
+ C = (value & 0x01) != 0;
+ value = (byte)(value >> 1);
+ Z = (value == 0);
+ N = false;
+ return (byte)value;
+}
+
+static byte ROL(int value)
+{
+ bool newC = (value & 0x80) != 0;
+ value = (byte)((value << 1) | (C ? 1 : 0));
+ C = newC;
+ Z = (value == 0);
+ N = (value & 0x80) != 0;
+ return (byte)value;
+}
+
+static byte ROR(int value)
+{
+ bool newC = (value & 0x01) != 0;
+ N = C;
+ value = (byte)((value >> 1) | (C ? 0x80 : 0));
+ C = newC;
+ Z = (value == 0);
+ return (byte)value;
+}
+
+extern void Push(int value)
+{
+ SetMemory((ushort)(0x100 + (S--)), (byte)value);
+}
+
+extern byte Pop(void)
+{
+ return GetMemory((ushort)(0x100 + (++S)));
+}
+
+static void PLP()
+{
+ int flags = Pop();
+ N = (flags & 0x80) != 0;
+ V = (flags & 0x40) != 0;
+ B = (flags & 0x10) != 0;
+ D = (flags & 0x08) != 0;
+ I = (flags & 0x04) != 0;
+ Z = (flags & 0x02) != 0;
+ C = (flags & 0x01) != 0;
+}
+
+static void PHA()
+{
+ Push(A);
+}
+
+static void PLA()
+{
+ SetA(Pop());
+}
+
+static void CLC()
+{
+ C = false;
+}
+
+static void CLD()
+{
+ D = false;
+}
+
+static void CLI()
+{
+ I = false;
+}
+
+static void CLV()
+{
+ V = false;
+}
+
+static void SEC()
+{
+ C = true;
+}
+
+static void SED()
+{
+ D = true;
+}
+
+static void SEI()
+{
+ I = true;
+}
+
+static byte INC(byte value)
+{
+ ++value;
+ Z = (value == 0);
+ N = (value & 0x80) != 0;
+ return (byte)value;
+}
+
+static void INX()
+{
+ X = INC(X);
+}
+
+static void INY()
+{
+ Y = INC(Y);
+}
+
+static byte DEC(byte value)
+{
+ --value;
+ Z = (value == 0);
+ N = (value & 0x80) != 0;
+ return (byte)value;
+}
+
+static void DEX()
+{
+ X = DEC(X);
+}
+
+static void DEY()
+{
+ Y = DEC(Y);
+}
+
+static void NOP()
+{
+}
+
+static void TXA()
+{
+ SetReg(&A, X);
+}
+
+static void TAX()
+{
+ SetReg(&X, A);
+}
+
+static void TYA()
+{
+ SetReg(&A, Y);
+}
+
+static void TAY()
+{
+ SetReg(&Y, A);
+}
+
+static void TXS()
+{
+ S = X;
+}
+
+static void TSX()
+{
+ SetReg(&X, S);
+}
+
+static ushort GetBR(ushort addr, bool *p_conditional, byte *p_bytes)
+{
+ *p_conditional = true;
+ *p_bytes = 2;
+ sbyte offset = (sbyte)GetMemory((ushort)(addr + 1));
+ ushort addr2 = (ushort)(addr + 2 + offset);
+ return addr2;
+}
+
+static void BR(bool branch, ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ ushort addr2 = GetBR(*p_addr, p_conditional, p_bytes);
+ if (branch)
+ {
+ *p_addr = addr2;
+ *p_bytes = 0; // don't advance addr
+ }
+}
+
+static void BPL(ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ BR(!N, p_addr, p_conditional, p_bytes);
+}
+
+static void BMI(ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ BR(N, p_addr, p_conditional, p_bytes);
+}
+
+static void BCC(ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ BR(!C, p_addr, p_conditional, p_bytes);
+}
+
+static void BCS(ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ BR(C, p_addr, p_conditional, p_bytes);
+}
+
+static void BVC(ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ BR(!V, p_addr, p_conditional, p_bytes);
+}
+
+static void BVS(ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ BR(V, p_addr, p_conditional, p_bytes);
+}
+
+static void BNE(ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ BR(!Z, p_addr, p_conditional, p_bytes);
+}
+
+static void BEQ(ushort *p_addr, bool *p_conditional, byte *p_bytes)
+{
+ BR(Z, p_addr, p_conditional, p_bytes);
+}
+
+static void JSR(ushort *p_addr, byte *p_bytes)
+{
+ *p_bytes = 3; // for next calculation
+ ushort addr2 = (ushort)(*p_addr + *p_bytes - 1);
+ ushort addr3 = (ushort)(GetMemory((ushort)(*p_addr + 1)) | (GetMemory((ushort)(*p_addr + 2)) << 8));
+ Push(HI(addr2));
+ Push(LO(addr2));
+ *p_addr = addr3;
+ *p_bytes = 0; // addr already changed
+}
+
+static void RTS(ushort *p_addr, byte *p_bytes)
+{
+ byte lo = Pop();
+ byte hi = Pop();
+ *p_bytes = 1; // make sure caller increases addr by one
+ *p_addr = (ushort)((hi << 8) | lo);
+}
+
+static void RTI(ushort *p_addr, byte *p_bytes)
+{
+ PLP();
+ byte hi = Pop();
+ byte lo = Pop();
+ *p_bytes = 0; // make sure caller does not increase addr by one
+ *p_addr = (ushort)((hi << 8) | lo);
+}
+
+static void JMP(ushort *p_addr, byte *p_bytes)
+{
+ *p_bytes = 0; // caller should not advance address
+ ushort addr2 = (ushort)(GetMemory((ushort)(*p_addr + 1)) | (GetMemory((ushort)(*p_addr + 2)) << 8));
+ *p_addr = addr2;
+}
+
+static void JMPIND(ushort *p_addr, byte *p_bytes)
+{
+ *p_bytes = 0; // caller should not advance address
+ ushort addr2 = (ushort)(GetMemory((ushort)(*p_addr + 1)) | (GetMemory((ushort)(*p_addr + 2)) << 8));
+ ushort addr3;
+ if ((addr2 & 0xFF) == 0xFF) // JMP($XXFF) won't go over page boundary
+ addr3 = (ushort)(GetMemory(addr2) | (GetMemory((ushort)(addr2 - 0xFF)) << 8)); // 6502 "bug" - will use XXFF and XX00 as source of address
+ else
+ addr3 = (ushort)(GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8));
+ *p_addr = addr3;
+}
+
+// "A:FF X:FF Y:FF S:FF P:XX-XXXXX"
+static void GetDisplayState(char *state, int state_size)
+{
+ snprintf(state, state_size, "A:%02X X:%02X Y:%02X S:%02X P:%c%c-%c%c%c%c%c",
+ A,
+ X,
+ Y,
+ S,
+ N ? 'N' : ' ',
+ V ? 'V' : ' ',
+ B ? 'B' : ' ',
+ D ? 'D' : ' ',
+ I ? 'I' : ' ',
+ Z ? 'Z' : ' ',
+ C ? 'C' : ' '
+ );
+}
+
+static byte GetIndX(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) + X);
+ return GetMemory((ushort)(GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8)));
+}
+
+static void SetIndX(byte value, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) + X);
+ ushort addr3 = (ushort)(GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8));
+ SetMemory(addr3, value);
+}
+
+static byte GetIndY(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)));
+ ushort addr3 = (ushort)((GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8)) + Y);
+ return GetMemory(addr3);
+}
+
+static void SetIndY(byte value, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)));
+ ushort addr3 = (ushort)((GetMemory(addr2) | (GetMemory((ushort)(addr2 + 1)) << 8)) + Y);
+ SetMemory(addr3, value);
+}
+
+static byte GetZP(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = GetMemory((ushort)(addr + 1));
+ return GetMemory(addr2);
+}
+
+static void SetZP(byte value, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = GetMemory((ushort)(addr + 1));
+ SetMemory(addr2, value);
+}
+
+static byte GetZPX(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = GetMemory((ushort)(addr + 1));
+ return GetMemory((byte)(addr2 + X));
+}
+
+static void SetZPX(byte value, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = GetMemory((ushort)(addr + 1));
+ SetMemory((byte)(addr2 + X), value);
+}
+
+static byte GetZPY(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = GetMemory((ushort)(addr + 1));
+ return GetMemory((byte)(addr2 + Y));
+}
+
+static void SetZPY(byte value, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ ushort addr2 = GetMemory((ushort)(addr + 1));
+ SetMemory((byte)(addr2 + Y), value);
+}
+
+static byte GetABS(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+ return GetMemory(addr2);
+}
+
+static void SetABS(byte value, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+ SetMemory(addr2, value);
+}
+
+static byte GetABSX(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+ return GetMemory((ushort)(addr2 + X));
+}
+
+static void SetABSX(byte value, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ ushort addr2 = (ushort)((GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8)) + X);
+ SetMemory(addr2, value);
+}
+
+static byte GetABSY(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ ushort addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+ return GetMemory((ushort)(addr2 + Y));
+}
+
+static void SetABSY(byte value, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ ushort addr2 = (ushort)((GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8)) + Y);
+ SetMemory(addr2, value);
+}
+
+static byte GetIM(ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ return GetMemory((ushort)(addr + 1));
+}
+
+extern void Execute(ushort addr, bool (*ExecutePatch)(void))
+{
+ bool conditional;
+ byte bytes;
+
+ PC = addr;
+
+ while (true)
+ {
+ while (true)
+ {
+ bytes = 1;
+ //bool breakpoint = false;
+ //if (Breakpoints.Contains(PC))
+ // breakpoint = true;
+ bool breakpoint = (addr == 0xFD88);
+ if (trace || breakpoint || step)
+ {
+ ushort addr2;
+ char line[27];
+ char dis[13];
+ DisassembleLong(PC, &conditional, &bytes, &addr2, dis, sizeof(dis), line, sizeof(line));
+ char state[33];
+ GetDisplayState(state, sizeof(state));
+ char full_line[80];
+ snprintf(full_line, sizeof(full_line), "%-30s%s\n", line, state);
+#ifdef WIN32
+ OutputDebugStringA(full_line);
+#else
+ pc.printf("%s", full_line);
+#endif
+ if (step)
+ step = step; // user can put debug breakpoint here to allow stepping
+ if (breakpoint)
+ breakpoint = breakpoint; // user can put debug breakpoint here to allow break
+ }
+ if (ExecutePatch != 0 && !ExecutePatch()) // allow execute to be overriden at a specific address
+ break;
+ }
+
+ switch (GetMemory(PC))
+ {
+ case 0x00: BRK(&bytes); break;
+ case 0x01: ORA(GetIndX(PC, &bytes)); break;
+ case 0x05: ORA(GetZP(PC, &bytes)); break;
+ case 0x06: SetZP(ASL(GetZP(PC, &bytes)), PC, &bytes); break;
+ case 0x08: PHP(); break;
+ case 0x09: ORA(GetIM(PC, &bytes)); break;
+ case 0x0A: SetA(ASL(A)); break;
+ case 0x0D: ORA(GetABS(PC, &bytes)); break;
+ case 0x0E: SetABS(ASL(GetABS(PC, &bytes)), PC, &bytes); break;
+
+ case 0x10: BPL(&PC, &conditional, &bytes); break;
+ case 0x11: ORA(GetIndY(PC, &bytes)); break;
+ case 0x15: ORA(GetZPX(PC, &bytes)); break;
+ case 0x16: SetZPX(ASL(GetZPX(PC, &bytes)), PC, &bytes); break;
+ case 0x18: CLC(); break;
+ case 0x19: ORA(GetABSY(PC, &bytes)); break;
+ case 0x1D: ORA(GetABSX(PC, &bytes)); break;
+ case 0x1E: SetABSX(ASL(GetABSX(PC, &bytes)), PC, &bytes); break;
+
+ case 0x20: JSR(&PC, &bytes); break;
+ case 0x21: AND(GetIndX(PC, &bytes)); break;
+ case 0x24: BIT(GetZP(PC, &bytes)); break;
+ case 0x25: AND(GetZP(PC, &bytes)); break;
+ case 0x26: SetZP(ROL(GetZP(PC, &bytes)), PC, &bytes); break;
+ case 0x28: PLP(); break;
+ case 0x29: AND(GetIM(PC, &bytes)); break;
+ case 0x2A: SetA(ROL(A)); break;
+ case 0x2C: BIT(GetABS(PC, &bytes)); break;
+ case 0x2D: AND(GetABS(PC, &bytes)); break;
+ case 0x2E: ROL(GetABS(PC, &bytes)); break;
+
+ case 0x30: BMI(&PC, &conditional, &bytes); break;
+ case 0x31: AND(GetIndY(PC, &bytes)); break;
+ case 0x35: AND(GetZPX(PC, &bytes)); break;
+ case 0x36: SetZPX(ROL(GetZPX(PC, &bytes)), PC, &bytes); break;
+ case 0x38: SEC(); break;
+ case 0x39: AND(GetABSY(PC, &bytes)); break;
+ case 0x3D: AND(GetABSX(PC, &bytes)); break;
+ case 0x3E: SetABSX(ROL(GetABSX(PC, &bytes)), PC, &bytes); break;
+
+ case 0x40: RTI(&PC, &bytes); break;
+ case 0x41: EOR(GetIndX(PC, &bytes)); break;
+ case 0x45: EOR(GetZP(PC, &bytes)); break;
+ case 0x46: SetZP(LSR(GetZP(PC, &bytes)), PC, &bytes); break;
+ case 0x48: PHA(); break;
+ case 0x49: EOR(GetIM(PC, &bytes)); break;
+ case 0x4A: SetA(LSR(A)); break;
+ case 0x4C: JMP(&PC, &bytes); break;
+ case 0x4D: EOR(GetABS(PC, &bytes)); break;
+ case 0x4E: LSR(GetABS(PC, &bytes)); break;
+
+ case 0x50: BVC(&PC, &conditional, &bytes); break;
+ case 0x51: EOR(GetIndY(PC, &bytes)); break;
+ case 0x55: EOR(GetZPX(PC, &bytes)); break;
+ case 0x56: SetZPX(LSR(GetZPX(PC, &bytes)), PC, &bytes); break;
+ case 0x58: CLI(); break;
+ case 0x59: EOR(GetABSY(PC, &bytes)); break;
+ case 0x5D: EOR(GetABSX(PC, &bytes)); break;
+ case 0x5E: SetABSX(LSR(GetABSX(PC, &bytes)), PC, &bytes); break;
+
+ case 0x60: RTS(&PC, &bytes); break;
+ case 0x61: ADC(GetIndX(PC, &bytes)); break;
+ case 0x65: ADC(GetZP(PC, &bytes)); break;
+ case 0x66: SetZP(ROR(GetZP(PC, &bytes)), PC, &bytes); break;
+ case 0x68: PLA(); break;
+ case 0x69: ADC(GetIM(PC, &bytes)); break;
+ case 0x6A: SetA(ROR(A)); break;
+ case 0x6C: JMPIND(&PC, &bytes); break;
+ case 0x6D: ADC(GetABS(PC, &bytes)); break;
+ case 0x6E: SetABS(ROR(GetABS(PC, &bytes)), PC, &bytes); break;
+
+ case 0x70: BVS(&PC, &conditional, &bytes); break;
+ case 0x71: ADC(GetIndY(PC, &bytes)); break;
+ case 0x75: ADC(GetZPX(PC, &bytes)); break;
+ case 0x76: SetZPX(ROR(GetZPX(PC, &bytes)), PC, &bytes); break;
+ case 0x78: SEI(); break;
+ case 0x79: ADC(GetABSY(PC, &bytes)); break;
+ case 0x7D: ADC(GetABSX(PC, &bytes)); break;
+ case 0x7E: SetABSX(ROR(GetABSX(PC, &bytes)), PC, &bytes); break;
+
+ case 0x81: SetIndX(A, PC, &bytes); break;
+ case 0x84: SetZP(Y, PC, &bytes); break;
+ case 0x85: SetZP(A, PC, &bytes); break;
+ case 0x86: SetZP(X, PC, &bytes); break;
+ case 0x88: DEY(); break;
+ case 0x8A: TXA(); break;
+ case 0x8C: SetABS(Y, PC, &bytes); break;
+ case 0x8D: SetABS(A, PC, &bytes); break;
+ case 0x8E: SetABS(X, PC, &bytes); break;
+
+ case 0x90: BCC(&PC, &conditional, &bytes); break;
+ case 0x91: SetIndY(A, PC, &bytes); break;
+ case 0x94: SetZPX(Y, PC, &bytes); break;
+ case 0x95: SetZPX(A, PC, &bytes); break;
+ case 0x96: SetZPY(X, PC, &bytes); break;
+ case 0x98: TYA(); break;
+ case 0x99: SetABSY(A, PC, &bytes); break;
+ case 0x9A: TXS(); break;
+ case 0x9D: SetABSX(A, PC, &bytes); break;
+
+ case 0xA0: SetY(GetIM(PC, &bytes)); break;
+ case 0xA1: SetA(GetIndX(PC, &bytes)); break;
+ case 0xA2: SetX(GetIM(PC, &bytes)); break;
+ case 0xA4: SetY(GetZP(PC, &bytes)); break;
+ case 0xA5: SetA(GetZP(PC, &bytes)); break;
+ case 0xA6: SetX(GetZP(PC, &bytes)); break;
+ case 0xA8: TAY(); break;
+ case 0xA9: SetA(GetIM(PC, &bytes)); break;
+ case 0xAA: TAX(); break;
+ case 0xAC: SetY(GetABS(PC, &bytes)); break;
+ case 0xAD: SetA(GetABS(PC, &bytes)); break;
+ case 0xAE: SetX(GetABS(PC, &bytes)); break;
+
+ case 0xB0: BCS(&PC, &conditional, &bytes); break;
+ case 0xB1: SetA(GetIndY(PC, &bytes)); break;
+ case 0xB4: SetY(GetZPX(PC, &bytes)); break;
+ case 0xB5: SetA(GetZPX(PC, &bytes)); break;
+ case 0xB6: SetX(GetZPY(PC, &bytes)); break;
+ case 0xB8: CLV(); break;
+ case 0xB9: SetA(GetABSY(PC, &bytes)); break;
+ case 0xBA: TSX(); break;
+ case 0xBC: SetY(GetABSX(PC, &bytes)); break;
+ case 0xBD: SetA(GetABSX(PC, &bytes)); break;
+ case 0xBE: SetX(GetABSY(PC, &bytes)); break;
+
+ case 0xC0: CPY(GetIM(PC, &bytes)); break;
+ case 0xC1: CMP(GetIndX(PC, &bytes)); break;
+ case 0xC4: CPY(GetZP(PC, &bytes)); break;
+ case 0xC5: CMP(GetZP(PC, &bytes)); break;
+ case 0xC6: SetZP(DEC(GetZP(PC, &bytes)), PC, &bytes); break;
+ case 0xC8: INY(); break;
+ case 0xC9: CMP(GetIM(PC, &bytes)); break;
+ case 0xCA: DEX(); break;
+ case 0xCC: CPY(GetABS(PC, &bytes)); break;
+ case 0xCD: CMP(GetABS(PC, &bytes)); break;
+ case 0xCE: SetABS(DEC(GetABS(PC, &bytes)), PC, &bytes); break;
+
+ case 0xD0: BNE(&PC, &conditional, &bytes); break;
+ case 0xD1: CMP(GetIndY(PC, &bytes)); break;
+ case 0xD5: CMP(GetZPX(PC, &bytes)); break;
+ case 0xD6: SetZPX(DEC(GetZPX(PC, &bytes)), PC, &bytes); break;
+ case 0xD8: CLD(); break;
+ case 0xD9: CMP(GetABSY(PC, &bytes)); break;
+ case 0xDD: CMP(GetABSX(PC, &bytes)); break;
+ case 0xDE: SetABSX(DEC(GetABSX(PC, &bytes)), PC, &bytes); break;
+
+ case 0xE0: CPX(GetIM(PC, &bytes)); break;
+ case 0xE1: SBC(GetIndX(PC, &bytes)); break;
+ case 0xE4: CPX(GetZP(PC, &bytes)); break;
+ case 0xE5: SBC(GetZP(PC, &bytes)); break;
+ case 0xE6: SetZP(INC(GetZP(PC, &bytes)), PC, &bytes); break;
+ case 0xE8: INX(); break;
+ case 0xE9: SBC(GetIM(PC, &bytes)); break;
+ case 0xEA: NOP(); break;
+ case 0xEC: CPX(GetABS(PC, &bytes)); break;
+ case 0xED: SBC(GetABS(PC, &bytes)); break;
+ case 0xEE: SetABS(INC(GetABS(PC, &bytes)), PC, &bytes); break;
+
+ case 0xF0: BEQ(&PC, &conditional, &bytes); break;
+ case 0xF1: SBC(GetIndY(PC, &bytes)); break;
+ case 0xF5: SBC(GetZPX(PC, &bytes)); break;
+ case 0xF6: SetZPX(INC(GetZPX(PC, &bytes)), PC, &bytes); break;
+ case 0xF8: SED(); break;
+ case 0xF9: SBC(GetABSY(PC, &bytes)); break;
+ case 0xFD: SBC(GetABSX(PC, &bytes)); break;
+ case 0xFE: SetABSX(INC(GetABSX(PC, &bytes)), PC, &bytes); break;
+
+ default:
+ {
+ printf("Invalid opcode %02X at %04X", GetMemory(PC), PC);
+ exit(1);
+ }
+ }
+
+ PC += bytes;
+ }
+}
+
+// Examples:
+// FFFF FF FF FF JMP ($FFFF)
+// FFFF FF FF FF LDA $FFFF,X
+extern void DisassembleLong(ushort addr, bool *p_conditional, byte *p_bytes, ushort *p_addr2, char *dis, int dis_size, char *line, int line_size)
+{
+ DisassembleShort(addr, p_conditional, p_bytes, p_addr2, dis, dis_size);
+ snprintf(line, line_size, "%04X ", addr);
+ for (int i = 0; i < 3; ++i)
+ {
+ if (i < *p_bytes)
+ snprintf(line+strlen(line), line_size-strlen(line), "%02X ", GetMemory((ushort)(addr + i)));
+ else
+ strcat_s(line, line_size, " ");
+ }
+ strcat_s(line, line_size, dis);
+}
+
+static void Ind(char *dis, int dis_size, char* opcode, ushort addr, ushort *p_addr2, byte *p_bytes)
+{
+ *p_bytes = 3;
+ ushort addr1 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+ *p_addr2 = (ushort)(GetMemory(addr1) | (GetMemory((ushort)(addr1 + 1)) << 8));
+ snprintf(dis, dis_size, "%s ($%0X4)", opcode, addr1);
+}
+
+static void IndX(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ snprintf(dis, dis_size, "%s ($%02X,X)", opcode, GetMemory((ushort)(addr + 1)));
+}
+
+static void IndY(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ snprintf(dis, dis_size, "%s ($%02X),Y", opcode, GetMemory((ushort)(addr + 1)));
+}
+
+static void ZP(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ snprintf(dis, dis_size, "%s $%02X", opcode, GetMemory((ushort)(addr + 1)));
+}
+
+static void ZPX(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ snprintf(dis, dis_size, "%s $%02X,X", opcode, GetMemory((ushort)(addr + 1)));
+}
+
+static void ZPY(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ snprintf(dis, dis_size, "%s $%02X,Y", opcode, GetMemory((ushort)(addr + 1)));
+}
+
+static void ABS(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ snprintf(dis, dis_size, "%s $%04X", opcode, GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+}
+
+static void ABSAddr(char *dis, int dis_size, char* opcode, ushort addr, ushort *p_addr2, byte *p_bytes)
+{
+ *p_bytes = 3;
+ *p_addr2 = (ushort)(GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+ snprintf(dis, dis_size, "%s $%04X", opcode, *p_addr2);
+}
+
+static void ABSX(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ snprintf(dis, dis_size, "%s $%04X,X", opcode, GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+}
+
+static void ABSY(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 3;
+ snprintf(dis, dis_size, "%s $%04X,Y", opcode, GetMemory((ushort)(addr + 1)) | (GetMemory((ushort)(addr + 2)) << 8));
+}
+
+static void IM(char *dis, int dis_size, char* opcode, ushort addr, byte *p_bytes)
+{
+ *p_bytes = 2;
+ snprintf(dis, dis_size, "%s #$%02X", opcode, GetMemory((ushort)(addr + 1)));
+}
+
+static void BRX(char *dis, int dis_size, char* opcode, ushort addr, bool *p_conditional, ushort *p_addr2, byte *p_bytes)
+{
+ *p_bytes = 2;
+ *p_conditional = true;
+ sbyte offset = (sbyte)GetMemory((ushort)(addr + 1));
+ *p_addr2 = (ushort)(addr + 2 + offset);
+ snprintf(dis, dis_size, "%s $%04X", opcode, *p_addr2);
+}
+
+// JMP ($FFFF)
+// LDA $FFFF,X
+extern void DisassembleShort(ushort addr, bool *p_conditional, byte *p_bytes, ushort *p_addr2, char *dis, int dis_size)
+{
+ *p_conditional = false;
+ *p_addr2 = 0;
+ *p_bytes = 1;
+
+ switch (GetMemory(addr))
+ {
+ case 0x00: strcpy_s(dis, dis_size, "BRK"); return;
+ case 0x01: IndX(dis, dis_size, "ORA", addr, p_bytes); return;
+ case 0x05: ZP(dis, dis_size, "ORA", addr, p_bytes); return;
+ case 0x06: ZP(dis, dis_size, "ASL", addr, p_bytes); return;
+ case 0x08: strcpy_s(dis, dis_size, "PHP"); return;
+ case 0x09: IM(dis, dis_size, "ORA", addr, p_bytes); return;
+ case 0x0A: strcpy_s(dis, dis_size, "ASL A"); return;
+ case 0x0D: ABS(dis, dis_size, "ORA", addr, p_bytes); return;
+ case 0x0E: ABS(dis, dis_size, "ASL", addr, p_bytes); return;
+
+ case 0x10: BRX(dis, dis_size, "BPL", addr, p_conditional, p_addr2, p_bytes); return;
+ case 0x11: IndY(dis, dis_size, "ORA", addr, p_bytes); return;
+ case 0x15: ZPX(dis, dis_size, "ORA", addr, p_bytes); return;
+ case 0x16: ZPX(dis, dis_size, "ASL", addr, p_bytes); return;
+ case 0x18: strcpy_s(dis, dis_size, "CLC"); return;
+ case 0x19: ABSY(dis, dis_size, "ORA", addr, p_bytes); return;
+ case 0x1D: ABSX(dis, dis_size, "ORA", addr, p_bytes); return;
+ case 0x1E: ABSX(dis, dis_size, "ASL", addr, p_bytes); return;
+
+ case 0x20: ABSAddr(dis, dis_size, "JSR", addr, p_addr2, p_bytes); return;
+ case 0x21: IndX(dis, dis_size, "AND", addr, p_bytes); return;
+ case 0x24: ZP(dis, dis_size, "BIT", addr, p_bytes); return;
+ case 0x25: ZP(dis, dis_size, "AND", addr, p_bytes); return;
+ case 0x26: ZP(dis, dis_size, "ROL", addr, p_bytes); return;
+ case 0x28: strcpy_s(dis, dis_size, "PLP"); return;
+ case 0x29: IM(dis, dis_size, "AND", addr, p_bytes); return;
+ case 0x2A: strcpy_s(dis, dis_size, "ROL A"); return;
+ case 0x2C: ABS(dis, dis_size, "BIT", addr, p_bytes); return;
+ case 0x2D: ABS(dis, dis_size, "AND", addr, p_bytes); return;
+ case 0x2E: ABS(dis, dis_size, "ROL", addr, p_bytes); return;
+
+ case 0x30: BRX(dis, dis_size, "BMI", addr, p_conditional, p_addr2, p_bytes); return;
+ case 0x31: IndY(dis, dis_size, "AND", addr, p_bytes); return;
+ case 0x35: ZPX(dis, dis_size, "AND", addr, p_bytes); return;
+ case 0x36: ZPX(dis, dis_size, "ROL", addr, p_bytes); return;
+ case 0x38: strcpy_s(dis, dis_size, "SEC"); return;
+ case 0x39: ABSY(dis, dis_size, "AND", addr, p_bytes); return;
+ case 0x3D: ABSX(dis, dis_size, "AND", addr, p_bytes); return;
+ case 0x3E: ABSX(dis, dis_size, "ROL", addr, p_bytes); return;
+
+ case 0x40: strcpy_s(dis, dis_size, "RTI"); return;
+ case 0x41: IndX(dis, dis_size, "EOR", addr, p_bytes); return;
+ case 0x45: ZP(dis, dis_size, "EOR", addr, p_bytes); return;
+ case 0x46: ZP(dis, dis_size, "LSR", addr, p_bytes); return;
+ case 0x48: strcpy_s(dis, dis_size, "PHA"); return;
+ case 0x49: IM(dis, dis_size, "EOR", addr, p_bytes); return;
+ case 0x4A: strcpy_s(dis, dis_size, "LSR A"); return;
+ case 0x4C: ABSAddr(dis, dis_size, "JMP", addr, p_addr2, p_bytes); return;
+ case 0x4D: ABS(dis, dis_size, "EOR", addr, p_bytes); return;
+ case 0x4E: ABS(dis, dis_size, "LSR", addr, p_bytes); return;
+
+ case 0x50: BRX(dis, dis_size, "BVC", addr, p_conditional, p_addr2, p_bytes); return;
+ case 0x51: IndY(dis, dis_size, "EOR", addr, p_bytes); return;
+ case 0x55: ZPX(dis, dis_size, "EOR", addr, p_bytes); return;
+ case 0x56: ZPX(dis, dis_size, "LSR", addr, p_bytes); return;
+ case 0x58: strcpy_s(dis, dis_size, "CLI"); return;
+ case 0x59: ABSY(dis, dis_size, "EOR", addr, p_bytes); return;
+ case 0x5D: ABSX(dis, dis_size, "EOR", addr, p_bytes); return;
+ case 0x5E: ABSX(dis, dis_size, "LSR", addr, p_bytes); return;
+
+ case 0x60: strcpy_s(dis, dis_size, "RTS"); return;
+ case 0x61: IndX(dis, dis_size, "ADC", addr, p_bytes); return;
+ case 0x65: ZP(dis, dis_size, "ADC", addr, p_bytes); return;
+ case 0x66: ZP(dis, dis_size, "ROR", addr, p_bytes); return;
+ case 0x68: strcpy_s(dis, dis_size, "PLA"); return;
+ case 0x69: IM(dis, dis_size, "ADC", addr, p_bytes); return;
+ case 0x6A: strcpy_s(dis, dis_size, "ROR A"); return;
+ case 0x6C: Ind(dis, dis_size, "JMP", addr, p_addr2, p_bytes); return;
+ case 0x6D: ABS(dis, dis_size, "ADC", addr, p_bytes); return;
+ case 0x6E: ABS(dis, dis_size, "ROR", addr, p_bytes); return;
+
+ case 0x70: BRX(dis, dis_size, "BVS", addr, p_conditional, p_addr2, p_bytes); return;
+ case 0x71: IndY(dis, dis_size, "ADC", addr, p_bytes); return;
+ case 0x75: ZPX(dis, dis_size, "ADC", addr, p_bytes); return;
+ case 0x76: ZPX(dis, dis_size, "ROR", addr, p_bytes); return;
+ case 0x78: strcpy_s(dis, dis_size, "SEI"); return;
+ case 0x79: ABSY(dis, dis_size, "ADC", addr, p_bytes); return;
+ case 0x7D: ABSX(dis, dis_size, "ADC", addr, p_bytes); return;
+ case 0x7E: ABSX(dis, dis_size, "ROR", addr, p_bytes); return;
+
+ case 0x81: IndX(dis, dis_size, "STA", addr, p_bytes); return;
+ case 0x84: ZP(dis, dis_size, "STY", addr, p_bytes); return;
+ case 0x85: ZP(dis, dis_size, "STA", addr, p_bytes); return;
+ case 0x86: ZP(dis, dis_size, "STX", addr, p_bytes); return;
+ case 0x88: strcpy_s(dis, dis_size, "DEY"); return;
+ case 0x8A: strcpy_s(dis, dis_size, "TXA"); return;
+ case 0x8C: ABS(dis, dis_size, "STY", addr, p_bytes); return;
+ case 0x8D: ABS(dis, dis_size, "STA", addr, p_bytes); return;
+ case 0x8E: ABS(dis, dis_size, "STX", addr, p_bytes); return;
+
+ case 0x90: BRX(dis, dis_size, "BCC", addr, p_conditional, p_addr2, p_bytes); return;
+ case 0x91: IndY(dis, dis_size, "STA", addr, p_bytes); return;
+ case 0x94: ZPX(dis, dis_size, "STY", addr, p_bytes); return;
+ case 0x95: ZPX(dis, dis_size, "STA", addr, p_bytes); return;
+ case 0x96: ZPY(dis, dis_size, "STX", addr, p_bytes); return;
+ case 0x98: strcpy_s(dis, dis_size, "TYA"); return;
+ case 0x99: ABSY(dis, dis_size, "STA", addr, p_bytes); return;
+ case 0x9A: strcpy_s(dis, dis_size, "TXS"); return;
+ case 0x9D: ABSX(dis, dis_size, "STA", addr, p_bytes); return;
+
+ case 0xA0: IM(dis, dis_size, "LDY", addr, p_bytes); return;
+ case 0xA1: IndX(dis, dis_size, "LDA", addr, p_bytes); return;
+ case 0xA2: IM(dis, dis_size, "LDX", addr, p_bytes); return;
+ case 0xA4: ZP(dis, dis_size, "LDY", addr, p_bytes); return;
+ case 0xA5: ZP(dis, dis_size, "LDA", addr, p_bytes); return;
+ case 0xA6: ZP(dis, dis_size, "LDX", addr, p_bytes); return;
+ case 0xA8: strcpy_s(dis, dis_size, "TAY"); return;
+ case 0xA9: IM(dis, dis_size, "LDA", addr, p_bytes); return;
+ case 0xAA: strcpy_s(dis, dis_size, "TAX"); return;
+ case 0xAC: ABS(dis, dis_size, "LDY", addr, p_bytes); return;
+ case 0xAD: ABS(dis, dis_size, "LDA", addr, p_bytes); return;
+ case 0xAE: ABS(dis, dis_size, "LDX", addr, p_bytes); return;
+
+ case 0xB0: BRX(dis, dis_size, "BCS", addr, p_conditional, p_addr2, p_bytes); return;
+ case 0xB1: IndY(dis, dis_size, "LDA", addr, p_bytes); return;
+ case 0xB4: ZPX(dis, dis_size, "LDY", addr, p_bytes); return;
+ case 0xB5: ZPX(dis, dis_size, "LDA", addr, p_bytes); return;
+ case 0xB6: ZPY(dis, dis_size, "LDX", addr, p_bytes); return;
+ case 0xB8: strcpy_s(dis, dis_size, "CLV"); return;
+ case 0xB9: ABSY(dis, dis_size, "LDA", addr, p_bytes); return;
+ case 0xBA: strcpy_s(dis, dis_size, "TSX"); return;
+ case 0xBC: ABSX(dis, dis_size, "LDY", addr, p_bytes); return;
+ case 0xBD: ABSX(dis, dis_size, "LDA", addr, p_bytes); return;
+ case 0xBE: ABSY(dis, dis_size, "LDX", addr, p_bytes); return;
+
+ case 0xC0: IM(dis, dis_size, "CPY", addr, p_bytes); return;
+ case 0xC1: IndX(dis, dis_size, "CMP", addr, p_bytes); return;
+ case 0xC4: ZP(dis, dis_size, "CPY", addr, p_bytes); return;
+ case 0xC5: ZP(dis, dis_size, "CMP", addr, p_bytes); return;
+ case 0xC6: ZP(dis, dis_size, "DEC", addr, p_bytes); return;
+ case 0xC8: strcpy_s(dis, dis_size, "INY"); return;
+ case 0xC9: IM(dis, dis_size, "CMP", addr, p_bytes); return;
+ case 0xCA: strcpy_s(dis, dis_size, "DEX"); return;
+ case 0xCC: ABS(dis, dis_size, "CPY", addr, p_bytes); return;
+ case 0xCD: ABS(dis, dis_size, "CMP", addr, p_bytes); return;
+ case 0xCE: ABS(dis, dis_size, "DEC", addr, p_bytes); return;
+
+ case 0xD0: BRX(dis, dis_size, "BNE", addr, p_conditional, p_addr2, p_bytes); return;
+ case 0xD1: IndY(dis, dis_size, "CMP", addr, p_bytes); return;
+ case 0xD5: ZPX(dis, dis_size, "CMP", addr, p_bytes); return;
+ case 0xD6: ZPX(dis, dis_size, "DEC", addr, p_bytes); return;
+ case 0xD8: strcpy_s(dis, dis_size, "CLD"); return;
+ case 0xD9: ABSY(dis, dis_size, "CMP", addr, p_bytes); return;
+ case 0xDD: ABSX(dis, dis_size, "CMP", addr, p_bytes); return;
+ case 0xDE: ABSX(dis, dis_size, "DEC", addr, p_bytes); return;
+
+ case 0xE0: IM(dis, dis_size, "CPX", addr, p_bytes); return;
+ case 0xE1: IndX(dis, dis_size, "SBC", addr, p_bytes); return;
+ case 0xE4: ZP(dis, dis_size, "CPX", addr, p_bytes); return;
+ case 0xE5: ZP(dis, dis_size, "SBC", addr, p_bytes); return;
+ case 0xE6: ZP(dis, dis_size, "INC", addr, p_bytes); return;
+ case 0xE8: strcpy_s(dis, dis_size, "INX"); return;
+ case 0xE9: IM(dis, dis_size, "SBC", addr, p_bytes); return;
+ case 0xEA: strcpy_s(dis, dis_size, "NOP"); return;
+ case 0xEC: ABS(dis, dis_size, "CPX", addr, p_bytes); return;
+ case 0xED: ABS(dis, dis_size, "SBC", addr, p_bytes); return;
+ case 0xEE: ABS(dis, dis_size, "INC", addr, p_bytes); return;
+
+ case 0xF0: BRX(dis, dis_size, "BEQ", addr, p_conditional, p_addr2, p_bytes); return;
+ case 0xF1: IndY(dis, dis_size, "SBC", addr, p_bytes); return;
+ case 0xF5: ZPX(dis, dis_size, "SBC", addr, p_bytes); return;
+ case 0xF6: ZPX(dis, dis_size, "INC", addr, p_bytes); return;
+ case 0xF8: strcpy_s(dis, dis_size, "SED"); return;
+ case 0xF9: ABSY(dis, dis_size, "SBC", addr, p_bytes); return;
+ case 0xFD: ABSX(dis, dis_size, "SBC", addr, p_bytes); return;
+ case 0xFE: ABSX(dis, dis_size, "INC", addr, p_bytes); return;
+
+ default:
+ strcpy_s(dis, dis_size, "???");
+ return;
+ //throw new Exception(string.Format("Invalid opcode {0:X2}", memory[addr]));
+ }
+}