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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
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    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

    Scorpion 2 issue

    someone beat me to it lol, but thats the same fix .
  2. 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.
  3. 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

  4. 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!
  5. 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.
  6. 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!
  7. 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.
  8. 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!
  9. 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)
  10. 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.
  11. MAGIK

    Maygay m1a repair thread and tips

    That might be a fault with U5. U5 is responsible for driving the PSU relay . U5 pin 8, driven by U11 pin9 . So it could be a problem at U11 causing the PSU relay line to rapid pulse. It could also be a fault with U5 , or the relay in the PSU.
  12. MAGIK

    Maygay m1a repair thread and tips

    A probe is essential. It tells you the hi or lo logic state of a pin on an IC by showing it on a red or green led, and tells you if a line is pulsing or static. See one of the biggest issues you get with maygays is the amount of things that are directly connected to the databus. Theres quite a few buffer and latch ICs on the board, and if they fail they tend to jam one or all the lines on the CPUs data bus HI or LO and stop the board from working. And its hard to find if you dont know what to look for. What I tend to do when I first get a board is power it up with no program card in it and check pins 11-13 and 15-19 on the RAM for activity. You shouldn't get any indication off the probe at all in this case because in a reset state the data bus should be in whats called a "high impedance state" - it should just appear to be dead. I have just done a board there where all the data lines were HI in reset - cause was the 74ls374 at U17 feeding back 4v on all the data lines.. And thats only meant to be an output chip for the reels!
  13. MAGIK

    Maygay m1a repair thread and tips

    You are not going to fix one of these blind. buy yourself a logic probe, the elenco 560 on ebay is a good choice. Also get a multimeter with continuity check because track breaks are prolific on M1s.
  14. MAGIK

    Maygay m1a repair thread and tips

    ok shut it down first off because the 8051 has not started and all the lamp outputs on that side are stuck on . First question - have you a logic probe in your possesion.
  15. MAGIK

    MPU4 Test Jig Software

    have a look on www.planetemu.net - websites in french but the MPU3, 4 and 5 test ROMs are all on there.
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