This is unfinished! Notable missing features are an assembler and a way of loading programs other than the built-in demo.
| Address | Name | Comment |
|---|---|---|
$0000 |
Reset Vector | |
$0000-$7EFF |
ROM | |
$7F00-$7FFF |
I/O Space | |
$8000-$EFFF |
RAM | |
$F000-$FFFF |
Video RAM | Fixed-palette 64x64 4-bit bitmap |
| I/O Registers | ||
$7F00 |
Monitor UART | Read/write, reading pops ASCII keycode from internal FIFO |
$7F10 |
Audio voice 1 Pan/Volume | Left nibble is pan, 0X for left, FX for right, and 8X for center |
$7F11 |
Audio voice 2 Pan/Volume | |
$7F12 |
Audio voice 3 Pan/Volume | |
$7F13 |
Audio voice 4 Pan/Volume | |
$7F14-$7F17 |
Reserved | Might be used later for voice waveforms |
$7F18 |
Audio voice 1 Frequency | Hertz, in 12-4 fixed point |
$7F1A |
Audio voice 2 Frequency | |
$7F1C |
Audio voice 3 Frequency | |
$7F1E |
Audio voice 4 Frequency |
These source files are all public domain.
Feel free to take, modify, or rehost them; No credit required.
Please let me know if you make something cool with them!
Read more here.
index.html: Debugger interface
glue.js: Debugger glue and memory mapping
vm.js: CPU emulator
snd.js: Voice chip emulator
asm.js: Assembler