Den Sun, 22 Sep 2019 13:31:54 -0500 skrev Jim Brain <brain_at_jbrain.com>: > On 9/22/2019 6:39 AM, Michał Pleban wrote: > > Hello! > > > > Jim Brain wrote: > >> * Not sure how to hide the registers under some other IO, like > >> SID mirrors or such, as any write will bleed through to the SID, > >> unless IO is mapped out (and, I think memory write enable is not > >> strobed when you are in IO space, but I could be wrong. Either > >> way, hiding under IO means essentially you'll have to bank IO out > >> to use. I'm not sure that's useful. > > SID uses only registers $D400-$D41C, so you could reuse $D41D-$D41F > > without any worry that the writes do anything to the SID. > > > > Regards, > > Michau. > > > > > 2 issues: > > * Some of the newer DIS replacements use those addresses > * The MMU needs far more than 4 addresses, unless I switch to > indirect registers (IO1 is the address, IO2 is the data), but I'd > prefer not to do that. Perhaps use extra addresses in the VIC-II address space? (Not sure if anything bad happens if you touch those addresses though). Maybe you could put registers in the $FFxx range like on the C128, with enable/disable in the regular I/O space. -- (\_/) Copy the bunny to your mails to help (O.o) him achieve world domination. (> <) Come join the dark side. /_|_\ We have cookies.Received on 2020-05-29 22:41:37
Archive generated by hypermail 2.3.0.