On 1/10/19 8:11 PM, Francesco Messineo wrote: > On Thu, Jan 10, 2019 at 7:54 PM Jim Brain <brain@jbrain.com> wrote: >> >> On 1/10/2019 12:40 PM, Mia Magnusson wrote: >> >> Den Wed, 9 Jan 2019 12:52:46 +0100 skrev Francesco Messineo >> <francesco.messineo@gmail.com>: >> >> see how they did the "burst mode" between 1571 and C128. On the 1571 >> there's an additional 6526 with only two pins used, they didn't even >> bother to substitute one of the 6522. >> >> That was surely done to make the 1570/1571 as compatible to a 1541 as >> possible, to make for example copy protection work better. >> >> >> >> As I recall, tho, they used all of the previously free 6522 IO pins, as the parallel cable on a 1571 has to be put on the 6526... > > they used 6 of the 8 previously free PA pins. But with burst mode possible between 1571 and C128, what would you want to use a parallel cable for? One of my 1571 came with a 8521R0 in the CIA socket. :) GerritReceived on 2019-01-10 21:00:57
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