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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

    Mpu3 frustration!

    Reflow solder on the plugs for red and green also, they easily crack. And look in the plugs both sides make sure youve not got a broken pin the leads are getting on for 40 years old!
  2. MAGIK

    Mpu3 frustration!

    Check the resistor pack thats connected across the reel opto inputs on the board. You will get reel A fault with no reels connected ! with nothing plugged in all reels will appear to be jammed. If all the reels are spinning normally and your getting reel A fault, look in the back of the machine and see if you can see the reel opto lamps ( early cabs actually had incandescant bulbs for the light source in the opto sensors) lighting up. Sometimes they can die. If a reel is shuddering or not moving its more likely to be a drive transistor or one of the ICs buffering the reels (74LS04s, ICs 12 to 15) if the reels are running, and you can confirm that its not the reel backboard at fault as it has a bunch of resistors on board that can fail, then you are looking at replacing T55 , and then checking IC17, the 74ls138 controlling the opto sensor select, is working. if thats working then you look for pulses on pins 10 -14 of IC5, the 6821 thats interfacing the optos to the cpu. One of the pins will always be stuck as no reel connected to it ( 4 reel machine) but 4 of them should slow pulse as the reels go through the optos. Every time the hole in the reel passes the opto sensor it should pulse ( I think it goes LO to HI briefly but that could be the other way around, to put simply you should see 4 pins pulse when 4 reels moving , if 2 are stuck then thats your problem!) Also change the smoothing caps on the regulator board because bad caps can cause reel jitter and cause the reel to be in the wrong position when the CPU looks for the optos.
  3. MAGIK

    Itt eprom emulator

    It does exactly what it says on the tin. Its an old fashioned 2708 /2716 eprom emulator. You use the emulator box to plug into a board where the real PROM should sit and you program the box with your code, so that you can see what it would do in whatever board /piece of equipment your testing. Quite an old, and rare find!
  4. If you dont get that blue battery off that board, and get all the corrosion cleaned up , all the carbon tracing removed, and the traces repaired and reinforced itll just go boom again.
  5. MAGIK

    War of the worlds

    ah ! looks like an appolo9 rebuild.
  6. MAGIK

    Bell Fruit closing

    Bellfruit scorpion 4 , especially the later smiley 2 stuff is handy for the operators because theres a ton of spares around. They are everywhere! But from a collectors point of view the golden age is the late 80s early 90s, lots of absolutely iconic system 85 and scorpion machines still knocking around to this day.
  7. MAGIK

    Bell Fruit closing

    someone needs to get a hold of the tech docs out the office while they clear out! Sad news to hear BFM closing but not surprising, the internet is destroying all other walks of life so this is no different.
  8. MAGIK

    BWB Line Up

    Now that will be a bit of rareness - they must have made a 2p kit for the seafronts! I wonder how it plays when compared to the 10p ROM.
  9. MAGIK

    M1 help

    thats a lovely machine, bloddy tall cabinet tho I had one a few years back tricky to get into the living room!
  10. MAGIK

    M1 help

    funny you should mention that.... maygaytest.BIN
  11. MAGIK

    Bags of cash

    Thats a nice crystal MPU4 that one. wouldnt mind seeing a gameplay video!
  12. 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)
  13. 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?
  14. MAGIK

    MPU types, a long list!

    nice to see this thread revived!
  15. MAGIK

    club seven

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