Den Thu, 10 Jan 2019 20:24:21 +0100 skrev Gerrit Heitsch <gerrit@laosinh.s.bawue.de>: > 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. It would of course had been better if they had used some of the CIA pins instead. > But with burst mode possible between 1571 and C128, what would you > want to use a parallel cable for? I can't remember any commercial product available to use burst mode in C64 mode back in the days. Anyway burst mode were afaik slower than the parallell cable loaders, and it didn't support drive-to-drive copy like you afaik could do with the parallell cable things. -- (\_/) Copy the bunny to your mails to help (O.o) him achieve world domination. (> <) Come join the dark side. /_|_\ We have cookies.Received on 2019-01-10 22:01:49
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