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  1. No problem. I was sat here working on my Parallax...

    No problem. I was sat here working on my Parallax Propeller project for work anyhow...

    Dave
  2. I'll start us off then... Board layout:...

    I'll start us off then...

    Board layout: http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/8032/321449.gif

    Schematic:...
  3. Just checking the obvious... You have got the...

    Just checking the obvious...

    You have got the latest code?

    You have put the original kernal ROM back in?

    You have put my PETTEST in the correct type of 2K EPROM (2716)?

    You have put my...
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    Good news!!! >>> Daver2 thanks so much for...

    Good news!!!

    >>> Daver2 thanks so much for your precious help and thanks to the other members!

    No problems. Enjoy your machine...

    I assume you mean UI10 rather than UH10?

    It is...
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    OK, PETTEST out of EDIT socket and EDIT ROM...

    OK,

    PETTEST out of EDIT socket and EDIT ROM back into EDIT socket.

    Test PET with BASIC and see what the 'bytes free' message says.

    Dave
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    Yep, you can stop now. That looks good to me. ...

    Yep, you can stop now. That looks good to me.

    The next thing is to test the keyboard PIA and keyboard itself.

    Reset the PET and get the ROM checksum and keyboard test screen up with the count...
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    Pin number 9 = +5V supply. That definitely...

    Pin number 9 = +5V supply. That definitely wouldn't have done the memory chip any good :-(!

    >>> Now screen show pass 0000c.

    Excellent. Keep going...

    Dave
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    I don't care about the screen wobbling at this...

    I don't care about the screen wobbling at this point in time - we are testing the RAM for now. Can we concentrate on one problem at a time please.

    Let's get to memory pass 20 without an error and...
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    OK :-)! Dave

    OK :-)!

    Dave
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    Test 0 is where the firmware fills all of memory...

    Test 0 is where the firmware fills all of memory with zeros and checks that zeros are there after the fill (i.e. mainly checking for a stuck '1'). This test is passing OK.

    Test 1 is where the...
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    >>> can i try to run pettester again for 1...

    >>> can i try to run pettester again for 1 hour....

    Yes please, the longer the better... Also, close the PET up so that the temperature has a chance to build up within the case. Temperature is...
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    We can also let the PET start-up (with - say -...

    We can also let the PET start-up (with - say - 264 byte free) and try and enter the machine code monitor (TIM) and have a look at the memory around where the PET thinks there is a memory fault. We...
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    >>> whit the pettester in ud8 socket, i ve always...

    >>> whit the pettester in ud8 socket, i ve always same checksum for each rom.

    Yes, but is the value for each ROM consistent?

    >>> I tested rams for many passes..... 0 to 9 and afer again...
    ...
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    You keep changing things and I have no idea what...

    You keep changing things and I have no idea what you are doing...

    Any IC in the RAM chain can be causing problems - but my PETTEST should test them all (that is the point of the test afterall)......
  15. Hi Dave, I am still catching up with all the...

    Hi Dave,

    I am still catching up with all the posts since I have been away on business, but the OP has tried multiple PIAs (some of which are - supposedly - known good) and the PET does the same...
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    It's a bit blurred, but it does look like 0ee2...

    It's a bit blurred, but it does look like 0ee2 (which is bank 0).

    Can I ask exactly what devices you have used in bank 0? Are they all from the same manufacturer with the same part number? Can you...
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    If you look at the second image back in post...

    If you look at the second image back in post #387, the address is 4b33 in that case (the only 16-bit hex number displayed). Addresses 0000 through 3fff are in bank 0 whilst addresses 4000 through...
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    >>> I inserted Cia and Via for keyboard values=...

    >>> I inserted Cia and Via for keyboard values= 00

    Ah, so the chips were out for the keyboard. When the 'countdown' screen is displayed (with the ROM checksums displayed) pressing a key should...
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    I came back this morning. Over on 2 on Wed and...

    I came back this morning. Over on 2 on Wed and then at a contractor's on Thu.

    We must go out for a curry next time I am up. The regular haunt is the Bombay Balti.

    Dave
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    The memory test takes forever (!) it tests all of...

    The memory test takes forever (!) it tests all of memory all of the time in a loop. You should get an incrementing PASS counter every time it successfully completes one entire memory pass.

    I see...
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    Ok, So, the ROM checksums are good for BASIC 2...

    Ok,

    So, the ROM checksums are good for BASIC 2 (7800 3838 506a 7c98).

    If you didn't have a keyboard connected, then the keyboard PIA must be duff (or something else is causing the '17'...
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    Just got back from my business trip from the cold...

    Just got back from my business trip from the cold and dark North West of England.

    I see you are starting to get some success now (and I missed all of the action)!

    I will check the EPROM...
  23. I just edited my post with a bit of further...

    I just edited my post with a bit of further information - but a good clean never did anyone any harm either :-)!

    Dave
  24. It looks like two additional signals on top of...

    It looks like two additional signals on top of the VIDEO ON pulse.

    CB1 should be an input. It appears to be (erroneously) shown as an output on the Commodore schematics?

    Therefore, with UC7 IN...
  25. Might be worth having a look at the VIDEO ON...

    Might be worth having a look at the VIDEO ON signal at UC7 pin 18 with both UC7 installed and not.

    Dave
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