Spiro Trikaliotis wrote: > > Hello Ruud, > > do you really mean 6809, not 6509? I would be interested in the former > (6809), but not the latter (6509). 6509 CPUs are much wanted as a replacement for CBM-II machines. I think 6809s are easier to get. We were already talking a lot about replacing CBM CPUs with a 6502 or 65816, and Ruud said he already did this. I wonder if it is possible to do this to the 6509 as well. IIRC, adresses 0 and 1 contain some sort of a banking register, that is only applied to the output port if some special opcodes are executed. If the replacement processor has a SYNC ouput, it should be possible to test for these opcodes with an external circuit and enable the banking output accordingly. Nicolas - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
Archive generated by hypermail 2.1.1.