Re: option ROM into a 3032

From: Ethan Dicks <>
Date: Wed, 27 Sep 2017 18:17:17 -0400
Message-ID: <>
On Wed, Sep 27, 2017 at 4:24 PM, Francesco Messineo
<> wrote:
> looks like UF6 is bad, it doesn't output the VRAM Write signal (TV RAM R/W), its
> inputs are correct, so I'm going to replace it.

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.

> yes, I'm using petester since it cycles writing and reading to VRAM so
> it's easier to probe around.

I haven't fiddled with those ROM images.  I just grabbed them from  Not much code there - just a couple hundred bytes and,
of course, the vector addresses at the top.  I should disassemble them
to see what they are really doing.

Does anyone know where they came from?  I see upload dates from 2015.

> Let's see what happens when I replace UF6.

Good plan.


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Received on 2017-09-27 23:00:02

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