On 4/22/21 2:36 AM, smf wrote: > I tried to use a 2040 in vice (c64+ieee), does anyone know if the U1 > command is supposed to work or is it a known bug in the 1.2 rom? > > The first byte of every sector is always returned as 137 ($89), but the > rest of the sector is fine. When I disassembled the BIOS for the SoftBox, I found some interesting code that may be related: https://github.com/mnaberez/softbox/blob/4a5702cd14a16eab2a9c6a27923a912e5371e9cf/bios/1983-06-09.asm#L2222-L2287 > Work rounds or fixes welcome.... After issuing U1, the SoftBox uses M-R to read the first byte. It then uses B-P to read the remaining bytes. Regards, Mike -- Mike Naberezny (mike_at_naberezny.com) http://6502.orgReceived on 2021-04-22 20:00:03
Archive generated by hypermail 2.3.0.