On 02/26/2012 08:42 PM, Didier Derny wrote: > I just forgot the sprites.... > > I checked the swinSID only the write are supported, R/W is not even > connected. > (I tried to emulate an eprom with an avr but I failed, even the "tightest" > assembler was > Too slow. Perhaps that it could work with an xmega but the we have the 3v to > 5v problem.) Well, with a 1 MHz 6502, you have less than 500ns from _CS low to deliver the data. That's less than 10 cycles on a 20MHz AVR. I think one would need a CPLD or the like to emulate a CIA or VIC and with both you'd have to be cycle-exact since even the one cycle difference between the 6526 and 6526A tripped up some software. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2012-02-26 21:00:09
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