Feature drv1541parallel #21
Open
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
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
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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.