diff --git a/README.md b/README.md index f53acf8..b46c28b 100644 --- a/README.md +++ b/README.md @@ -8,25 +8,22 @@ So as a little R&D proj, I thought I'd convert Dave Rogers' Spectrum 128 Cybernoid routine (written in 1988). Here's a summary of how I did it: -. I got cybernoid.ay from -http://www.worldofspectrum.org/projectay/gdmusic.htm -. Split it into bin's with AYSplitR -. Disassembled with Inkland's dz80w (http://www.inkland.org.uk/dz80/index.htm) -. I wrote 6502 macros to replace the z80 opcodes -. For cybernoid, I hand converted the z80 code to 6502 (using the -macros) -. I added a few extension to AppleWin's debugger to help debug the 6502 -code (ACME symbol loading & ZP pointer support). +- I got cybernoid.ay from (here)[http://www.worldofspectrum.org/projectay/gdmusic.htm] +- Split it into bin's with AYSplitR +- Disassembled with Inkland's dz80w (here)[http://www.inkland.org.uk/dz80/index.htm] +- I wrote 6502 macros to replace the z80 opcodes +- For cybernoid, I hand converted the z80 code to 6502 (using the macros) +- I added a few extension to AppleWin's debugger to help debug the 6502 code (ACME symbol loading & ZP pointer support). I use Skyfox's MB detection routine. The Z80 regs are emulated with zero-page memory locations $F0..$F8 The playback routine is very inefficient, as it: -. saves the ZP memory -. restores the Z80 regs -. runs the IRQ handler -. saves the Z80 regs -. restores the ZP memory +- saves the ZP memory +- restores the Z80 regs +- runs the IRQ handler +- saves the Z80 regs +- restores the ZP memory This allows playback to work simultaneously with Applesoft & ProDOS. If DOS3.3 doesn't disable IRQs around disk I/O, then it won't work on a