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