On 11/4/2017 1:13 PM, Michał Pleban wrote: > Hello! > > Mia Magnusson wrote: > >> Maybe this is a bit too hard to actually do, but my idea is to keep >> track of what the CPU does and detect the LDA and STA Y-indirect >> instructions and then temporarily switch in the relevant bank during >> the correct cycle. > I don't think that it should be difficult. The 6502 emits SYNC signal > when it is fetching a new opcode. It can then be checked if it's LDA/STA > (xx),Y opcode and appropriate memory bank can be switched. Nothing a > CPLD could not solve. > > Regards, > Michau. > > Message was sent through the cbm-hackers mailing list http://www.go4retro.com/downloads/Fake6509/ Given that the 6509 has the AEC behavior of the 6510, I believe you'll need a 65C02, which is what I used. Someone still has to write the HDL, but I think the 6502.org discussion Steve linked should give folks what they need. Jim -- Jim Brain brain@jbrain.com www.jbrain.com Message was sent through the cbm-hackers mailing listReceived on 2017-11-04 20:00:02
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