3 ms·
Compatibility with the shift register in the VIC-20 CIA was a part of it, but Commodore had a “fix” that was removed from the board during a revision that would
by EvanAnderson 3y ago
Compatibility with the shift register in the VIC-20 CIA was a part of it, but Commodore had a “fix” that was removed from the board during a revision that would have resulted in fast serial transfers from the 1541 on a C-64.
Finding primary sources while on my phone is difficult, but there’s some discussion here that would probably point you to a primary source. (Bill Herd and other have spoken about it in panels at various VCF gatherings.)
https://www.lemon64.com/forum/viewtopic.php?t=58317 https://www.lemon64.com/forum/viewtopic.php?t=58317
- selcuka 3y agoOoh, I didn't know this detail. Thanks. It sounds terrifying: > It also had something to do with a board screw hole. Iirc, the pcb already had a screwhole where the traces should be. Robert Russell was the engineer who designed those IEC traces and so when he found out about it, he was pretty much upset, but it was too late, they already modified thousands of boards.