Re: PET 3032 alive :)

From: Gerrit Heitsch <>
Date: Thu, 2 Feb 2017 20:30:30 +0100
Message-ID: <>
On 02/02/2017 08:26 PM, Gerrit Heitsch wrote:
> 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?

If the schematics at

fit your board, it would be R41 and R42 which you'd have to cross to 
swap the banks.


       Message was sent through the cbm-hackers mailing list
Received on 2017-02-02 20:01:42

Archive generated by hypermail 2.2.0.