Diff: main.cpp

Revision:

2:74ecf50e4424

Parent:

1:09a3520030b4

diff -r 09a3520030b4 -r 74ecf50e4424 main.cpp
--- a/main.cpp	Sun Feb 11 11:10:58 2018 +0000
+++ b/main.cpp	Sun Feb 11 20:07:59 2018 +0000
@@ -25,7 +25,7 @@
 
 Inspired by Arduino code produced by Artkasser (https://github.com/artkasser)
 
-This code plays BBC micro (SN76489) VGM sound files on a BBC micro:bit.
+This code plays BBC micro (SN76489N) VGM sound files on a BBC micro:bit.
 
 Note that in this code version, the VGM data is stored as a byte array file
 (minus the header info), and not read-in from anywhere. Maybe later!?
@@ -34,7 +34,7 @@
 
 1 x BBC micro:bit breakout board (eg: Kitronik) to get to the required pins
 1 x SN74HC595 shift register IC - easy to obtain
-1 x SN76489 programmable sound generator (PSG) IC (From a reputable[!]
+1 x SN76489N programmable sound generator (PSG) IC (From a reputable[!]
     supplier. You can get them on Ebay and elsewhere but beware of fakes.
 2 x 0.1uF ceramic capacitors
 1 x 4MHz oscillator module - the connections list below assumes a '14-pin'
@@ -69,15 +69,15 @@
     micro:bit P15          MOSI     74HC595 pin 14 (SER)
     micro:bit P13          CE       74HC595 pin 12 (RCLK)
     micro:bit P2           SER      74HC595 pin 11 (SRCLK)
-    micro:bit P8           PSG ~WE  SN76489 pin 5 (~WE)
+    micro:bit P8           PSG ~WE  SN76489N pin 5 (~WE)
     74HC595 Data out       Data bus PSG Data lines - Note that the PSG data
                                     lines are labelled in REVERSE, so the
-                                    wiring between the 595 and the 76489 should
-                                    be 74HC595 D0 --- D7 SN76489
-                                       74HC595 D1 --- D6 SN76489 etc
+                                    wiring between the 595 and the 76489N should
+                                    be 74HC595 D0 --- D7 SN76489N
+                                       74HC595 D1 --- D6 SN76489N etc
     Oscillator P7          GND      To common ground with all other GND pins
-    Oscillator P8          CLK      SN76489 pin 16
-    Audio out              AUDIO    SN76489 pin 7 to an external amplifier,
+    Oscillator P8          CLK      SN76489N pin 14
+    Audio out              AUDIO    SN76489N pin 7 to an external amplifier,
                                     or a piezo sounder through a 1K resistor
     +5V                    VCC      Both ICs, pin 16, Oscillator pin 14; all
                                     active components EXCEPT the micro:bit
@@ -85,7 +85,7 @@
                                     parts
 
 For stability, connect 0.1uF capacitors between VCC and GND near the both the
-74HC595 and SN76489 chips.
+74HC595 and SN76489N chips.
 
 Double-check all wiring before powering up anything!