Den Fri, 2 Mar 2018 11:17:14 +0000 skrev smf <smf@null.net>: > On 02/03/2018 10:16, Mia Magnusson wrote: > > > Which one, $E or $F? And why? > > Assuming the 6509 in the p500 works the same as the 6510 in the c64, > then you can use the vic2 fetches to write to ram underneath $0/$1 > > http://codebase64.org/doku.php?id=base:ram_beneath_00_and_01 > > If so, it would be possible to write code for the p500 that would put > vic2 in 0-3fff of either of the ram banks and use the $3fff mechanism > to write to $0/$1. It would work on real hardware, but not on your > replacement. True! > The only way to emulate this behaviour is to disconnect the databus > and let it float, which requires new hardware. No, you can emulate it by writing to the currently selected bank as a real 6509 does, but read from a�non-existing bank. B.t.w. are there any software at all for P500, except it's built in kernal/basic roms? :) -- (\_/) Copy the bunny to your mails to help (O.o) him achieve world domination. (> <) Come join the dark side. /_|_\ We have cookies. Message was sent through the cbm-hackers mailing listReceived on 2018-03-02 13:01:07
Archive generated by hypermail 2.2.0.