Am 27. August 2019 00:05:07 schrieb silverdr_at_wfmh.org.pl: >> On 2019-08-26, at 23:24, Mia Magnusson <mia_at_plea.se> wrote: >> >>> It might be easier to do what Commodore has done in the 1570/71 and >>> use an additional 6526 just for the shift register. Then borrow the >>> code from the 1571. >> >> That would most likely be the solution that requires the least amount >> of work to get it up and running. >> >> Captain Obvious says that the con is of course that it needs a CIA. For >> a one-off or general DIY project that might not be a problem, but if >> someone were to order a bunch of PCBs and sell either as a complete kit >> or ready-built thing it might be troublesome to source CIAs. > > Pulling a CIA's shift register off a PLD would be Captain Obvious next > advice ;-) And then you need to add logic to put this CPLD somewhere into the CPU address space. Ok that probably goes into the CPLD as well :-) You also need to make sure you have the right output drivers. André >Received on 2020-05-29 22:57:25
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