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    >>> I tried the PetTest V4 on the VICE simulator...

    >>> I tried the PetTest V4 on the VICE simulator in 3032 mode and it works fine

    Yes, I should have said, I did the same thing too...

    Dave
  2. Hi Monty, >>> Enjoy!! I'm having fun!! I...

    Hi Monty,

    >>> Enjoy!! I'm having fun!!

    I can see you are :-)!

    I will have to give this a go when I get some spare time - probably next year :-(!

    Dave
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    That looks very similar to what I purchased... ...

    That looks very similar to what I purchased...

    A couple of things:

    1. Make sure you are purchasing a ready built unit rather than a kit!

    2. The power supply unit didn't come with mine....
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    I need to have a think :-)!!! Dave

    I need to have a think :-)!!!

    Dave
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    POLY BASIC is available in the DECUS library over...

    POLY BASIC is available in the DECUS library over at http://so-much-stuff.com/pdp8/software/decus.php.

    Unfortunately, it requires disk or tape storage to work.

    I tried it under sims just - but...
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    The problem with a logic probe is that it tells...

    The problem with a logic probe is that it tells you when something is high, low or pulsing. Sometimes you may get a little more information - but that is the basics.

    What I think you need to do...
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    That is good. All I can now think of is that...

    That is good.

    All I can now think of is that there is a data, address or selection problem on the PET logic itself that is interfering with the correct operation of the diagnostic ROM. This will...
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    Thanks. That is exactly what I am expecting......

    Thanks.

    That is exactly what I am expecting...

    The reset vector points to $FCD1 and the instructions at $FCD1 end up calling a subroutine at $E1DE (which is the entry point into my diagnostics...
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    Yes, There is a 4K FORTRAN and FOCAL. ...

    Yes,

    There is a 4K FORTRAN and FOCAL.

    Somewhere there is also a 4K BASIC.

    Dave
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    I can't see anything wrong with that. As Alice...

    I can't see anything wrong with that. As Alice would say "curiouser and curiouser"...

    Next issue could be that your kernel ROM is (in some way) different to what I am expecting...

    Each of the...
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    I have configured VICE as follows: -model 4016...

    I have configured VICE as follows:

    -model 4016
    -kernal ../kroms/kernal-2.901465-03.bin
    -editor ../V04/PETTESTE2KV04.bin

    On start-up, VICE tells me that the Kernel is for BASIC 2 based upon...
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    Pin 1 and 2 for reset. Thanks for the correction....

    Pin 1 and 2 for reset. Thanks for the correction.

    I have a problem with the video in that it is not showing what my PETTEST V4 firmware actually does according to the source code...

    The first...
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    He he... Documentation week I think. Dave

    He he...

    Documentation week I think.

    Dave
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    Thanks. OK, so you shouldn't get just that...

    Thanks.

    OK, so you shouldn't get just that screen on startup.

    Can you rig up a manual reset button to your PET please? Either connect a normally-open pushbutton (or switch) across C67 (1uF...
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    Quick question. Which version of my PETTESTER are...

    Quick question. Which version of my PETTESTER are you using? Are you using version 4 (as I pointed you to back in post #27?).

    Dave
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    Excellent. There doesn't seem to be any stuck...

    Excellent.

    There doesn't seem to be any stuck signals (so that is good).

    I need to go and check something in the source code - but I am in the middle of something at the moment so I will get...
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    Excellent, so the control signals are being...

    Excellent, so the control signals are being generated for the lower DRAM devices correctly.

    Next, I want you to concentrate on DRAM UI2.

    Can you probe around all of the pins on this IC ***...
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    Good. So, a few more: UI11 pins 1 and 19...

    Good. So, a few more:

    UI11 pins 1 and 19 (74LS244).
    UI10 pins 1 and 19 (74LS244).

    These are the control signals for the bus buffers between the DRAM chips and the CPU data bus. Pin 1 is /READ...
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    Ok, that's good. What about UD2 pin 1? Got a...

    Ok, that's good.

    What about UD2 pin 1? Got a pulse there?

    Dave
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    No, please don't start desoldering things on a...

    No, please don't start desoldering things on a whim please.

    I added a bit more information to my previous post for you to check a pin out.

    Let's see if we are getting correct reads and writes....
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    Page 0 and 1 RAM is all faulty... Forget the...

    Page 0 and 1 RAM is all faulty...

    Forget the character ROM at the moment.

    Is your main RAM socketed or not?

    Can you also check with your logic probe that you are getting pulses on UB2 pin 8...
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    Just check that the BIN file is exactly 2048...

    Just check that the BIN file is exactly 2048 bytes in size before you do the copying, otherwise the second copy won't be exactly at the right location.

    The EPROM burning software should also have...
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    Correct. All of the initial tests do not rely...

    Correct.

    All of the initial tests do not rely on pages 0 or 1 (the stack) to be working. All data for these initial tests are stored in the scarce CPU registers. The firmware tests pages 0 and 1...
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    So, we at least know that the video circuitry...

    So, we at least know that the video circuitry appears to work.

    Can you download my PETTEST code, burn it into a 2K EPROM, put it in place of the EDIT ROM and plug the kernal ROM in please. What do...
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    >>> Double screen cause pettester show 2...

    >>> Double screen cause pettester show 2 alternates screen.

    No idea what you are talking about?

    Ok, with the PETTEST ROM in the kernal ROM socket you are getting video. Is that what we are...
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