Re: option ROM into a 3032

From: Francesco Messineo <>
Date: Thu, 28 Sep 2017 10:26:23 +0200
Message-ID: <>
On Thu, Sep 28, 2017 at 12:17 AM, Ethan Dicks <> wrote:
> On Wed, Sep 27, 2017 at 4:24 PM, Francesco Messineo
> <> wrote:
> If the inputs are good and there's no good output, this is a good
> candidate.  It definitely has a lot to do with selecting the right
> data at the right time.

indeed UF6 was in a really bad shape. I've substituted with a good
74LS157 and now
the video ram gets written correctly.
The petester image shows a lot of bad DRAM and the video circuitry is
still not working good:
on every 8 columns, starting from the first, the character shape
flickers. I have excluded the chargen ROM, but I need to go back to
the schematic to understand what may be the problem here.

Frank IZ8DWF

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Received on 2017-09-28 09:00:02

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