Re: 7501/8501 R/W gate in

From: Francesco Messineo <*francesco.messineo_at_gmail.com*> Date: Sun, 30 Aug 2020 19:40:23 +0200 Message-ID: <CAESs-_wmcjz+M4m9fODzsGJjUi9YW_URnHrXOYx1z202BO0bug_at_mail.gmail.com> · francesco.messineo_at_gmail.com

On Sun, Aug 30, 2020 at 7:03 PM Frank Wolf <webmaster_at_frank-wolf.org> wrote:

> Don't we all have some scope shots of the 8501? LOL

I don't, since I have only failed 8501s

> You don't see what the GATE_IN logic is doing when it's low... and it's
> doing more than just latching R/W#

what else is gate_in doing then?
Another doubt I have is:  does R/W go hi-z as soon as AEC goes low or
does it go hi-z only at the next gate_in high transition?
(That would be a really strange latch enable acting on the output enable too...)

Thanks again
Frank