Re: Patching in a CBM disk drive connection in a C64 case.

From: Mike Stein <*mhs.stein_at_gmail.com*> Date: Sun, 3 Apr 2022 23:10:06 -0400 Message-ID: <CAHHfo1sq+VQJviRx60eb0NPnJpoqQPqom70yJMLN=jOjLhyTSQ_at_mail.gmail.com> · mhs.stein_at_gmail.com

FWIW Rockwell corrected the shift register problem; 6522-11 or earlier have
the bug, 6522-31 or later are OK

They also issued a work-around but it requires 3 extra chips.

m

On Fri, Apr 1, 2022 at 5:05 AM smf <smf_at_null.net> wrote:

> why the vic20 didn't have fast serial bus
>
> https://www.youtube.com/watch?v=km701Z3KQiI&t=970s
>
>
> why the c64 didn't have fast serial bus
>
> https://www.youtube.com/watch?v=km701Z3KQiI&t=1145s
>
>
> On 30/03/2022 16:46, Jim Brain wrote:
> > The 64 started life as VIC++, and the idea was the share preipherals.
> > 6526 fixed the shift register issue, but compatibility won the day.
> > 64 also uses bit stores (and slowed them down more to deal with VIC-II
> > cycle stealing).
> >
>
>