Looking at the datasheet, it appears that pin25 of the 6821 is called E (enable) and on 6820 is the familiar phi2 or pih0. Timings look compatible (but I didn't quite read all the datasheets), so I might give it a try and see what I get. On Thu, Feb 2, 2017 at 3:58 PM, Gerrit Heitsch <firstname.lastname@example.org> wrote: > On 02/02/2017 03:18 PM, Francesco Messineo wrote: >> >> I've spoken too soon :( >> Swapping the 6520s gives no cursor and no keyboard input, so I think I >> have to find a spare PIA (or design my own PLD version, if I want to >> spend some months of spare time doing it). >> Does anyone have a 6520 I can buy? > > > I read somewhere that you can also use an 6821, but I'm not 100% sure. Can > anyone confirm or deny it? And if deny, what are the differences? > > Gerrit > > > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2017-02-02 16:00:08
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