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Thread: Who knows something about the old NEC PC-6001A around here?

  1. #81

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    Only had a little while to play with it today but found out that the wire going from CN606 on the power supply was not attached to anything. It looks like it can only go to CN12, but the schematics don't make it explicit that CN606 -> CN12.

    CN12 goes to pins 44 and 46 in the cartridge slot, which this Japanese site says seems to be related to hotswap protection for the cartridges:

    MSW1 and MSW2 are shorted on the extension board side. Inside the expansion slot, there is a power-off switch, and when this switch is turned on, the power supply of the power supply unit is stopped. In other words, when you try to insert the ROM cartridge into the PC-6001, the power-off switch is physically turned on. The PC-6001 is designed to stop electrically if you attempt to handle it as dangerous as inserting the ROM cartridge while the PC-6001 is operating. If only this is done, the PC-6001 will not operate, but if the MSW1 and MSW2 are shorted on the ROM cartridge side, power supply from the power supply unit is started even if the power-off switch is ON. is. If you insert something thin like a board into the extension terminal, the power-off switch will not turn ON (do not touch the switch), so there is no need to short MSW1 and MSW2.
    Although Google Translate has made it more confusing than I want it to be, I think it's saying MSW1 and MSW2 are there to override the reset microswitch in the cartridge slot?

  2. #82

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    It was indeed shorted caps - the tantalums on the 12V and the -12V rail, right next to the PSU connector to the mainboard, were a zero-ohm dead short.

    Lucky for me, the RAM appears to be OK so far - I was able to get to the "How Many Pages?" screen.

    Unfortunately, the RETURN key doesn't seem to work (so I can't say how many pages) - I'm going to try cleaning it and then I guess see if there's some internal damage to the keyboard. The letter, number and shift keys seem to work.

    Thanks for the help! Looking forward to trying this thing out once the keyboard is touched up.

  3. #83

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    Good job finding that. You can try CTRL-M and see if it will accept that is return.

  4. #84

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    That worked great! I wish I had thought of that. Thanks a lot.

    I'll do some keyboard cleanup in the next few weeks and hopefully that will make this machine fully usable again!

  5. #85

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    Hope everyone is doing well with their oddball Z80s.

    Since the last post in this thread, I've also picked up a PC-6001mkII with an almost completely non-responsive keyboard. My original 6001 has no sound, but I'm hoping it's a dead electrolytic cap in the amplifier circuit. I set up a Japanese tape emulator on a spare Windows laptop and have been playing some games.

    Does anyone have a cartridge that they would be willing to measure for me? I'm working on a protoboard since the Japanese protoboard for the system seems difficult to obtain. alank2 is living my dream right now

    Measurements I think I already have or can figure out on my own, but it would be lovely to have confirmation:
    • Width and spacing of edge connector pins
    • Overall width of edge connector substrate (I'll need to pull the motherboard to get this measurement, but it's coming out anyway)


    I'd like these measurements, if you could please provide them:
    • Depth of edge connector pins
    • Thickness of the PCB. I hope it's a "standard" (read: cheap) 1.6mm
    • Width of the rest of the cartridge PCB after it gets wider when leaving the computer
    • Any screw hole positions, although I think it's going to end up a non-standard length


    Thanks in advance! So far my plan is to prototype it with paper until I get something that looks right, but it would be nice to have real measurements.

  6. #86

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    SSS see post #20 - I've got an extra cartridge expansion board I can send you if you want to pay for the shipping. It is just a raw PCB, but you can solder a 50 pin connector on it and this allows access to all the cartridge signals. Drop me a PM if interested.

  7. #87

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    Try asking in the "Japanese Vintage Computer Club" Facebook group. Might get the answer there. Cheers.

  8. #88

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    I've got a real cartridge too (1 of them) so I can take some measurements with calipers tonight.

  9. #89

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    NEC PC-6001 Canyon Climber Cartridge

    width 3.296"
    length 4.320"
    thickness 0.797"

    pcb width 2.870"
    pcb length 3.559" (no fingers)
    pcb length 4.031" (with fingers)
    pcb thickness 0.065" (1.6mm)
    pcb fingers width 2.571

    fingers pitch 0.100"
    fingers width 0.070"
    fingers thickness pcb only (no metal fingers) .059"
    fingers thickness with fingers on both sides measured 0.066 - each finger may be 0.0035" thick.

    there is one hole that lines up with the cartridge case - it is in the middle of the width (1.435" from each edge of pcb).
    hole is 0.323" diameter
    hole is also 0.880" from edge of fingers to its center.

  10. #90
    Join Date
    Sep 2009
    Location
    Coventry, UK
    Posts
    121

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    Could you please re-post the schemaic

    Cheers.

    Phill.

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