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MAGIK

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MAGIK last won the day on November 14 2017

MAGIK had the most liked content!

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About MAGIK

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    back from the internet dead!
  • Birthday 07/08/1978

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    pedster2008@live.com

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    Male
  • Location
    Holytown, North Lanarkshire
  • Interests
    Anything alternate, retro, against the grain, Im not a go with the status quo guy!

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  1. MAGIK

    Bags of cash

    Thats a nice crystal MPU4 that one. wouldnt mind seeing a gameplay video!
  2. MAGIK

    M1 help

    key to maygay is test the RAM pins with a logic probe while there is no card in. They should all be floating (not HI or LO) . If any are showing a signal theres a shorted IC on the databus. Second key is a magic number - 20C0. In nearly al M1 games the very first instruction in ROM ( at 2800h) loads a register with 1. The next instruction after that writes the value in the register to location 20C0. That happens to be pin 4 of U11 on 1A and 1B which sets IOenable to HI , ie turns it off. That in turn sets RAM enable at the PAL chip ON. If you cant do that, you cant peform a RAM test. just in case it helps , on maygay RAM sits at 0000-1FFF, the IO sits 2000-27FF and the ROM fills the address space after that (2800 and up)
  3. MAGIK

    MPU types, a long list!

    Your possibly a little off on your MPU release dates crest , stop the clock was released in 1984 was it not?
  4. MAGIK

    MPU types, a long list!

    nice to see this thread revived!
  5. MAGIK

    club seven

    itll be a dipswitch setting for the price of play on that. Small bank of switches on the mpu.
  6. MAGIK

    Scorpion 2 issue

    someone beat me to it lol, but thats the same fix .
  7. MAGIK

    Scorpion 2 issue

    have you checked the tracks that run under the battery area for volume up, down, OVL and most importantly SPC0/1? theres a chip select line to tell the sound circuit to use the sound ROMs high address lines and if it gets cut your samples all play in the wrong places! Watch my doctor who repair video ,shows you how to find and fix.
  8. Hi Magik,

     

    I fiddle around with a Summit Coin "Target Slot" fruit machine from 1982 or 1984. It has suffered battery damage and arcing on the CPU card. I read the Proms, and now I like to ckeck wether the files have been corrupted.

    It is a three reel machine with electromechanical reels, a soundboard and a lever on the right side.

     

    Maybe you can check the files?

     

     

    IMG_2012.JPG

  9. MAGIK

    Castle Big Fifty Repair

    nice strong traces on the board. Lots of vapour corrosion from the nicad but it looks like its only surface rot, you got lucky!
  10. MAGIK

    P.C.P Sunday Sport (aka take two?)

    Yep the serial communication ICs are probably dead. IC25 and 26 form the serial transiever. Pin 12 and 13 on IC26 tie back to IC4 CB1 and PB7 , pin 8 IC25 feeds back to CA2 IC5. I would guess that IC26, the input or receiver side is the likely culprit, verify you have -12v at pin 1of that first, then just replace it as the sound board will likely have data about sound playing or busy etc coming back on the dataport. I would do 25 as well as they are still fairly cheap and youve got scrap boards I think with them on anyway.
  11. MAGIK

    P.C.P Sunday Sport (aka take two?)

    Thats a weird cab that one, I thought it was maygay M1A/B at first looking at the front and then you open it and find out its an MPU4 inside!
  12. MAGIK

    Maygay M1 and M1A?

    There is small plug and design differences but as far as the plugs go its just plug location, they all hook up the same. I think there is an extra "control" port on M1. Architecture wise M1 has two 8279 keyboard driver ICs instead of an 8279 and 8051. They used the 8051 on M1A to reduce component count and simplify the board layout.
  13. MAGIK

    Maygay M1 and M1A?

    M1 can run on M1A or M1B easily enough. the RAM mod is quite easy to do you just need to remove the 6116 , clear out the extra holes thats already provided on the board , fit a 6264 and move the link to the 8k position. Ive done it quite a few times. You dont even need to use a 6264, any 8kbit RAM will do the job, you can still buy brand new at farnells for a fiver!
  14. MAGIK

    Maygay m1a repair thread and tips

    4049 is a bad example for a beginner because it has an unusual pin assignment. The easy way to find your power pins is turn the board around till the chip you are looking at his its writing the right way up, and the little notch or dot on the chip is to the left. Then , the top left pin is vcc (5v on a maygay board ) , and the bottom right pin is gnd (0v)
  15. MAGIK

    Maygay m1a repair thread and tips

    get your multimeter out and check the voltage coming into pin 15 of the RAM.. Before anyone comments, I know thats not the power supply pin. But theres a reason for the check.
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