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View Code? Open in Web Editor NEWA firmware patch for Commodore 1571 drive and internal C128D drive enabling RAM expansion use for track cache
License: MIT License
A firmware patch for Commodore 1571 drive and internal C128D drive enabling RAM expansion use for track cache
License: MIT License
Here we fall back on 1541 ROM code:
1571-TrackCacheROM/rampatch.asm
Line 294 in fd3356d
But instead we could reuse 1571 decoding routines for faster GCR decoding:
1571-TrackCacheROM/rampatch.asm
Line 251 in 586dfb0
ReadCache:
**sta $18 // track that we want to read, LF510 (read sector header puts it here for encoding, but some fastloaders might need it (SpeedDOS))**
iny // yes, track is cached, just put GCR data back and jump into ROM
lda (HDRPNT),y // needed sector number
sta hdroffs // keep it here
**sta $19 // sector number that we want to read, LF510 (read sector header puts it here for encoding, but some fastloaders might need it (SpeedDOS))**
SpeedDOS relies on having sector number here, so some other random code might too
Same in native 1571 part!
This:
1571-TrackCacheROM/rampatch.asm
Line 170 in c0318d4
should have been
jsr InitializeAndResetCache
because it returns to the patched instruction JMP C1D1
and nothing else uses InitializeAndResetCache
1571-TrackCacheROM/rampatch.asm
Line 219 in c0318d4
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