(Topic ID: 77391)

Gottlieb Sys80 Universal Tester (Leon design) -- MPU Diagnostic Tool


By acebathound

5 years ago



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  • 99 posts
  • 29 Pinsiders participating
  • Latest reply 2 years ago by acebathound
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    #47 4 years ago

    For the pinitech board, does it work with a 7404, or do you need to use a 74LS04? I'm not sure what the difference is between the two ICs.

    #49 4 years ago

    Ok, great, thanks.

    I have some 7404's on hand, but didn't have any 74LS04's.

    2 weeks later
    #50 4 years ago

    So, much to my surprise, standard .100" square headers didn't fit. I missed that round were required, but I'm having some trouble tracking them down. Where can you find round .100" headers?

    [edit]: I found some on amazon of all places. Couldn't find them on the usual electronics sites for some reason.

    amazon.com link »

    1 month later
    #52 4 years ago
    Quoted from acebathound:

    How's this working out for people? Helping to get your Sys80 boards diagnosed?
    I'm gonna be getting back into fixing up some more machines in about a month.. should be able to test with Marco's latest ROM code then. Will update here when that happens.
    ---
    http://www.pinitech.com - "Pinball Inspired Technology"
    Kits, upgrades and test equipment for pinball machines

    Yep, I fixed my Touchdown MPU a while back with Marco's ROM and your PCB.

    5 months later
    #64 3 years ago
    Quoted from MarAlb:

    For those who want to use the pinitech adapter in combination with Leon's system 80 test ROM......
    Using Leons' test ROM can be very confusing. Before I started to write my own test ROM's I encountered the limitations and the behaviour of Leons' test ROM. At that time, I talked with Leon also about this and he was also aware of that. But he was ill already and didn't have the time anymore to change the ROM :~(
    As I wanted to improve the test ROM (Leon was okay with that) I disassembled Leons' test ROM and was a bit surprised from what I saw. I suspect Leon was more used to program assembly with Intel-like instruction sets. I decided to write my own test ROM from scratch and improved it over the years.
    Back to Leons'.....when using the test ROM you will see a 1 flash at the LED connected to addressline a6 after some time. After the first flash, NOTHING is tested. Also, not the 5101 as is stated many times.
    Then after the first flash the memory test for the 5101 is executed. Only at location 0, and without a detection for missing addresslines. Then directly after the 5101 memory test, the memory test for switch matrix RIOT U4 is executed. Then the 2nd flash will appear at the addressline LED.
    This explains why you need to tie the /NMI (6502 pin 6, Non Maskable Interrupt)) to GND if Leons' ROM stalls after the first flash. This will execute the U4 memory test again. If it passes now and you will see a 2nd flash at the LED, the U4 RIOT is okay and the 5101 memory is bad. If it stalls again, U4 is failing and the 5101 memory is ok, or BOTH chips are failing. In this case, you need to remove the 5101 and generate an /NMI to be shure.
    Also, keep in mind, Leons' test order for the RIOT's is U4, U6 and U5 (left, right, middle RIOT). I did go wrong here using Leon's ROM the first times.
    Marco

    Interesting...thanks for the info

    1 week later
    #68 3 years ago
    Quoted from ChrisHibler:

    Here's my first build out. I used a socket for the 7404. That required me to raise the EPROM socket as high as I could. The second unit I built, I soldered the 7404 in directly. It fit together much nicer.
    --
    Chris Hibler - CARGPB #31
    http://www.Team-EM.com
    http://webpages.charter.net/chibler/Pinball/index.htm
    http://www.PinWiki.com - The new place for pinball repair info

    image_(resized).jpeg

    I soldered the SIP strips to the board, then used a socket for the EPROM. Then I cut out the middle brace of the socket so it would fit over the socketed 7404 chip below it.

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