Re: PLA equations for the 1551 drive's cart

From: Francesco Messineo <*francesco.messineo_at_gmail.com*> Date: Sat, 22 Feb 2025 20:31:48 +0100 Message-ID: <CAESs-_w83Bj_7csocNZyAOz2bgsnOEv_LL1gERrW3vajyvH=uw_at_mail.gmail.com> · francesco.messineo_at_gmail.com

On Sat, Feb 22, 2025 at 7:37 PM Uffe Jakobsen <uffe_at_uffe.org> wrote:

>
> Both C64, C16 and Plus/4 have dtape/atasette pins routes directly to the
> C2N port - but the difference here is that the 1530/1531's are not
> separately powered - that means no difference in potential when connecting to
> a unit that is powered on....
>
>
> Theory:
>
> So maybe the 7501/8501's aren't as that bad as their reputation - it just
> comes down to them being used in a "bad" design...
>
> Any thoughts about this theory ?

my single data point: the C16 I have has been donated more than 20
years ago by a then co-worker. He only had a tape drive, I've got that
tape drive too together with all his tapes. It was already dead and
the first time I've connected a disk drive to it was when I had my
first 6502+cpld replacement cpu working. Of course I always connect
any cable with everything powered off. I've learned this the hard way
in the early 1980's.

Frank