Re: PET 3032 alive :)

From: Francesco Messineo <>
Date: Thu, 2 Feb 2017 15:18:02 +0100
Message-ID: <>
I've spoken too soon :(
Swapping the 6520s gives no cursor and no keyboard input, so I think I
have to find a spare PIA (or design my own PLD version, if I want to
spend some months of spare time doing it).
Does anyone have a 6520 I can buy?

On Thu, Feb 2, 2017 at 1:02 PM, Francesco Messineo
<> wrote:
> Hi all,
> I've just repaired the 3032 electronics (case and all repaint will
> require months).
> It smoked a tantalum capacitor on first power-on (no, it wasn't
> shorted as I tested all of them before powering on), then it showed
> the usual random characters screen until I found and replaced two bad
> ROMs. It was an easy repair after all, considering that almost all
> chips have a 1979 date codes (two of them have a 1978 date code).
> I've wired the power transformer for 240V, it was originally wired for
> 220V, the secondaries give a bit more than 16V AC now and all the
> supply rails look fine.
> Now I'll test (as time permits) the ports (IEEE, parallel, both tapes).
> It was the one where I've found the "super tool" UD3 ROM expansion,
> and it's my only PET anyway :)
> CRT looks fine too, sharp and bright.
> Just happy about it, no questions :)
> Frank IZ8DWF

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Received on 2017-02-02 15:00:02

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