Re: PET diagnostics

From: Rob Clarke <>
Date: Thu, 12 Dec 2013 00:10:40 +0100
Message-ID: <>
Hi Christian,

i just scanned the "Testing the PET Computer" document that covers how 
it works. You can find it here:

The additional test programs referenced in the doc came on a set of 
tapes ( ) most of 
which which you can find here:

Steve, I wrote a PET diagnostic routine which tests the RAM and CRC 
checksums the ROM's which you're welcome to include.


On 11/12/2013 21:34, Christian Dirks wrote:
> Hi Rob,
> the used ROM set should be basic 1 according to
> I found a youtube video that claims to show 'A successful pass of the
> diagnostic rom':
> Unfortunately no further information :(
> Could you take a look at the documentation and dongles ?
> Christian
> Am 11.12.2013 21:13, schrieb Rob Clarke:
>> Yes, but it was only in the basic 1 ROM set. I have an original set of
>> documentation and dongles somewhere if you can't find it on-line.
>> I don't recall if it displays anything though, I think it used the red
>> LED on the mainboard.
>> Rob
>> On 11/12/2013 21:08, Christian Dirks wrote:
>>> Hi all,
>>> does anyone know, if there really is a diagnostic routine in the PET
>>> ROMs, and if so, what it should do/display ?
>>> When I power up my 2001-8C with the daignostic pin connected to GND, it
>>> blanks the screen and nothing more seems to happen.
>>> A quick test with a 'hello world' basic program works.
>>> The used ROM set is:
>>> 6540-019, -013, -015, -016, -012, -014, -018.
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Received on 2013-12-12 00:00:06

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