On 16/03/2018 22:57, Mia Magnusson wrote: > eems easier to use 6821 (which afaik is still possible to source > new from reasonable sources) for the standard I/O pins, while using a > CPLD or similar for emulation of the interrupt controller logic and all > other stuff that's not part of the simple I/O function. You could also use a 65c21 from western design centre, they do an NMOS compatible version. However you'd need a couple of them, because you need 24 i/o pins. I'm pretty sure you can get an io expander to hook up to a cpld to achieve the same thing with a lower chip count.Received on 2018-03-17 01:01:01
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