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Thread: Berzerk To Frenzy To Multigame

  1. #21
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    Quote Originally Posted by oldhank View Post
    I dont know what in looking at but it looks complicated to me
    It's just stuff

  2. #22
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    Update Time.
    IMG_20190925_133056.jpg IMG_20190925_133102.jpg
    We're well and truly in the home stretch now.
    Finished the programming for the GAL databuss IO logic which connects to pin 1(dir) pin on a 74ls245 . I found this pretty annoying difficult to get right. I was stuck on the Vram test for ages (3 flashes). I ended up having to to use my scope so I could check the output of each IC matched the output of the GAL.

    Decided to isolate the Z80 reset and upgrade the original flaky power on reset circuit with a Microchip Mcp120. That one little transistor looking chip above the rom does the job of all the components I've circled on the board in the second pic, works fantastic. Even though I had repaired that section, it's been playing up and will probably keep playing up due to corrosion damage from the battery. Now its fixed for good I'm also going to add in a little button to reset the board manually.
    Added in 100nf filter caps.
    Cut down the prototype board.

    Not much to do now, still waiting on my NVram.
    I'd like to replace the switch with a push button switch, problem is I'd have to program in some sort of flip flop circuit into the GAL which I'm not sure how to do. I also want this to reset the CPU at the same time so the 2 games could be switched on the fly.
    Besides that I'm very happy at the progress. I've basically achieved my main goal which was to make a Berzek/Frenzy multigame.
    Once I'm happy that everything is working perfectly I'll make something up in EasyEDA and make the board look spiffy.

  3. #23
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    IMG_20191016_161502.jpg
    The Dallas DS1220Y NVRAM's arrived so the prototype is 100% finished now.
    I added in the reset button also which you can hold down and flick the switch to change games.
    Everything works as intended and no corruption in the audits or high scores in either game so now its time to fire up EasyEDA and create something spiffy looking.

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