Feature drv1541parallel #21
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added 27 commits
March 25, 2024 22:50
…dard: VIA pins 2-9,18,39) cable
… the fly number of 32-byte (0) chunks needed to be sent via memory-write
…d content (value from -bash0)
…if needed, same with ZP code
…et, we are at the size limit
…ng block header error
…t prior NewDisk (caused by Configure)
…iteSector under 0x700
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This is a 1541 driver for drives (one or more) connected with a parallel cable. It is about twice as fast as original one.
The cable type is this one: https://sta.c64.org/cbmpar41c.html with VIA pin 18 (CB1) connected to PC2 - it's not the same as DolphinDOS one.
All 1541 connected drives have to use parallel cable, daisy-chained.
This is about twice as fast as regular 1541 driver thanks to GCR decoded on the fly using LFT's routine from Spindle 3.1.
Data cache within REU (shadow 1541) had to be removed because there is no space for that within disk driver area anymore. (With cache functions removed this new sector loading routine could be ported back to the original drv1541.s driver)
For VICE testing don't forget to set both the drive settings (Parallel cable = standard) and userport settings (Userport parallel drive cable), like:
x64 -parallel8 1 -userportdevice 21The sector transfer from drive to C64 takes 33 cycles for each byte (5 extra cycles to compute checksum on the drive side) and the handshake test branch on both sides is mostly not taken.