Re: PET 3032 alive :)

From: Gerrit Heitsch <>
Date: Thu, 2 Feb 2017 20:26:33 +0100
Message-ID: <>
On 02/02/2017 07:32 PM, Francesco Messineo wrote:
> And it's dead again :(
> I was typing the cbmlink bootstrap basic program.
> I saved it on tape and I was trying the first test runs as it just died on me.
> Now at reset it clears the video memory and sometimes it displays a
> few random characters but most of the time the screen remains just
> blank.
> I'm going to try to substitute the kernel ROM since on one of my
> programmers refuses to read entirely (on another one reads fine every
> time).
> With no kernel ROM, the screen remains full of characters as it should.
> Ok... old hardware isn't so easy to fix after all.

Could be a bad RAM. As far as I know, the 3032 uses 2 banks of 4116 
DRAMs. You can swap both banks by desoldering and then crossing 2 
resistors. If it's RAM, that should make the system behave differently. 
Which ones? For that I would need the schematics... Anyone have them?


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Received on 2017-02-02 20:00:02

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