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MAGIK

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MAGIK last won the day on November 14 2017

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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
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    Anything alternate, retro, against the grain, Im not a go with the status quo guy!

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  1. 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)
  2. 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.
  3. 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.
  4. 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!
  5. 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.
  6. 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.
  7. 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.
  8. MAGIK

    MDM Nudge Bonanza

    thats a weird version of that . Quite quirky, its a half size MPS2 cabinet.
  9. I can see from your picture you have a corroded trace around the resistors and electrolytic cap under the battery.
  10. heres a tip - try removing tr4 and D2. then find the side of R9 that does not buzz to the 5v rail and then you can manually reset the board by briefly jumping that point to 0v
  11. MAGIK

    Maygay m1a repair thread and tips

    It would do its directly connected to the CPU databus, so any stuck bits on that IC would mess with the relevant data bit across the whole board. I know original M1 has 245 buffer on the data lines but it would make little difference as CPU would just be staring at the garbage data when it tried to read the buffer, and it wouldnt be able to drive the stuck bits when it tried to write through it.
  12. MAGIK

    Maygay m1a repair thread and tips

    the very first thing the board should be doing is loading bit 0 (pin 4) of U11 with a 1 to switch off the IO and allow RAM test. if it cant do that, then U10 will keep setting output lines according to whatevers on its address pins because the PAL chip will still be setting pin 19 (IO enable ) Low and allowing U10 to run. The result of that is all the control lines for the board get screwed up, Mrdy at CPU goes gaga and the CPU gets lost in the weeds trying to execute the garbage its faced with. And wether it tries or not to continue, the watchdog will time out and reset the board and the whole merrygoround starts over. Maygay boards can have so many different faults and so many failures under test that even seasoned engineers can have a near nervous breakdown, so be patient in your troubleshooting!
  13. These boards can catch fire because of that short circuit. Its the 53v lamp voltage shorts across to the 0v or 12v depending on where the corrosion is bridging the trace. If your lucky, you fry the serial ICs on the far left of the board. If your unlucky, you burn a massive hole in the top of the PCB. Shame as well because project coin games are shit hot , very popular in their day and getting rarer now because of board burn outs.
  14. MAGIK

    Golden Ghost System80 ROM

    Ghost uses steppa ROM2 because essentially its the same program . Its just in ghost the feature reel code is disabled.
  15. MAGIK

    1984 MPU3 Naughty but Nice

    Couldn't help but noticing the boards missing. Think I will just drop this here....
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