On Thu, Jan 10, 2019 at 4:42 PM smf <smf@null.net> wrote: > > On 10/01/2019 15:32, Francesco Messineo wrote: > > But both the 1571 and C128 use 6526's serial shifter, so they aren't > > affected by 6522's bug. > > I know, I was just pointing out that the external hardware for direction > control wasn't just required by the 6522 hardware fix. > > I don't remember why the 1571 needed it. looking at the schematics, it's to "open-collector" the output. Not sure why the C128 doesn't need it :) (Probably because it's supposed to be the only device in the bus not having an open collector output on these two lines in burst mode)? Anyone? FrankReceived on 2019-01-10 18:00:02
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