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Type: Posts; User: dave_m

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    There are many places. Try...

    There are many places. Try http://www.zimmers.net/anonftp/pub/cbm/pet/games/english/index.html

    If the games use assembly language routines for speed, they may only work on certain versions of PET...
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    Yes, on my DataI/O chart, the Hitachi 482732A...

    Yes, on my DataI/O chart, the Hitachi 482732A uses the same family and pin code as the Intel 2732A. If you have no issues with the 2732A, you will need to check the socket adapter you built as daver2...
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    To check your programmer, try to program a 2732A...

    To check your programmer, try to program a 2732A on the 2732A setting (the adapter is not needed for this test of course).
    If this works, you should be able to program a 2532A EPROM on the 2732A...
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    How many bytes of memory does the start up screen...

    How many bytes of memory does the start up screen say? It performs a short RAM test on boot.
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    Thanks Mike, that was the write up I was looking...

    Thanks Mike, that was the write up I was looking for. I had forgotten that it was written by our friend Giovi who fixed his machine with only a DVM and a soldering iron. What a guy, he never gave up....
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    Yes, Dwight you beat me to it. I couldn't find...

    Yes, Dwight you beat me to it. I couldn't find the diagram on the web so I sketched one. Pin 24 must be Vcc on both sockets. Did I get it right?
    -Dave
    61573
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    Sky, Wired like that, the 2532 may program, but...

    Sky,
    Wired like that, the 2532 may program, but will not verify. To verify, the Vpp pin 21 of the 2532 must be at +5V. The adapter connects it to pin20 of the 2732 which will switch from +25V during...
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    You have BASIC2 ROMs. The ROMs that are different...

    You have BASIC2 ROMs. The ROMs that are different from the daver2 list may be bad or you have bad ROM sockets/solder joints.
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    I see the confusion, but there Dwight was...

    I see the confusion, but there Dwight was referring to the very first PETs that used the 6540 ROMs. It came in an odd 28 pin package that allowed for several chip selects with both high and low...
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    Hutch, This PET has the 4116 dynamic RAMS. One...

    Hutch,
    This PET has the 4116 dynamic RAMS. One needs eight good chips in the I row to get to boot.
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    Check the user manual to interpret the...

    Check the user manual to interpret the information. The manual can be found here: https://drive.google.com/drive/folders/1fyLbr1kcG98a2FDOMo1H5pj9lIdJpHcx

    Daver2 will tell us more but it looks...
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    SkyCaptain, The 2532 is pin for pin replacement...

    SkyCaptain, The 2532 is pin for pin replacement for your 4K ROMs and do not need an adapter in the PET. You will need a special adapter to program the 2532 on the PROM Programmer using the 2732...
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    isn't there a timer in the UV eraser? Don't run...

    isn't there a timer in the UV eraser? Don't run for more than 20 minutes or it may damage the EPROM if it is a powerful lamp.
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    Note that an adapter to burn a 2532 on the 2732...

    Note that an adapter to burn a 2532 on the 2732 setting requires the adapter with an isolation diode to protect one of the pins from the 25V. Make sure you use the correct adapter schematic. I failed...
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    Hi Hugo, if our OP tries this, he had better make...

    Hi Hugo, if our OP tries this, he had better make sure the four long screws that hold the transformer to the chassis are torqued very tight to keep the laminated plates together, or there will be a...
  16. An excellent well documented article on these...

    An excellent well documented article on these thermal printers. Thanks so much.
    -Dave
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    If you order some parts, make sure you get a few...

    If you order some parts, make sure you get a few 40 pin DIP sockets with good machined pin sockets. Since both PIA chips do not work in that socket, the socket may be bad as Dwight as mentioned.
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    It is the PIA in the C7 socket that will issue...

    It is the PIA in the C7 socket that will issue the interrupt. Does this happen with both 6520's in that location? Is C7-pin 18 (Video On) pulsing? That signal will trigger the IRQ every cycle of the...
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    ditto. I thought I lost a setting.

    ditto. I thought I lost a setting.
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    Emmanuel, For fixing very old computers, do...

    Emmanuel,

    For fixing very old computers, do not buy an EPROM Programmer unless its states that it can program the 2716 and 2732 chips and hopefully the 2532 chips. The 2532 is a pin for pin...
  21. Thread: PetVet

    by dave_m
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    Mike at bitfixer has a new part called ROMulator...

    Mike at bitfixer has a new part called ROMulator that has replaced the PETVet.

    To reprogram the Atmel microcontroller, you would need PHP and run a custom script file to create the load file....
  22. Thread: VHDL resources

    by dave_m
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    This is really good information. Thanks for...

    This is really good information. Thanks for posting. Previous to these texts, most of the books I've tried on VHDL seemed way to advanced/confusing for me. These books look understandable.
    -dave_m
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    Pip, CBM4032 works OK and puts the 40 character...

    Pip,
    CBM4032 works OK and puts the 40 character image starting 20 characters in, so it is in the middle of the screen. But you have to remember to do it before loading any game. A reset is required...
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    It is possible that the set up time from address...

    It is possible that the set up time from address lines in to data out is out of spec slow. You can not tell that from your manual tester. Those old parts had high internal delays.

    The open...
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    Dwight, I broke down and bought the gadget. It...

    Dwight,
    I broke down and bought the gadget. It works really nice. The software is going to take a little time to learn well. My Tektronix 453 scope is very upset with me...
    -Dave
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