Re: 7501/8501 R/W gate in

From: Francesco Messineo <*francesco.messineo_at_gmail.com*> Date: Sun, 30 Aug 2020 20:57:15 +0200 Message-ID: <CAESs-_wbMNEdyEO7u9mZV9zXkVYepAFPXmhv5iHjtuv9u5S6Jg_at_mail.gmail.com> · francesco.messineo_at_gmail.com

On Sun, Aug 30, 2020 at 8:49 PM Frank Wolf <webmaster_at_frank-wolf.org> wrote:
>
> GATE_IN just latches R/W# and AEC... that's all. Nothing more.
>
this changes *a whole lot* (at least in my reproduction...).
Gated AEC to R/W latch means that R/W remains driven after AEC going
low until GATE_IN goes high again...
Which is a bit of a nightmare since I'm out of free cells...
Does anyone know why this particular thing is needed (delay the R/W
hi-z until next gate_in)?

Thanks
Frank