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  • Re: Calling X68000 fans

    From Retroswim@21:2/121 to paulie420 on Thursday, May 15, 2025 20:55:10
    Awesome - pretty sure I'm subbed and will keep an eye peeled. :P

    Last week I began the task of recapping, but also took the opportunity to probe around with the ol' oscilloscope.

    I've verified the CPU is good, the clock crystals all work, and the ROM BIOS is working at least to an extent.

    Something is halting activity, even though the CPU comes out of, and remains out of reset. The 68000 itself has some other signals that can cause this, related to how the CPU can release the bus to peripherals (e.g. when you use accelerators in Amigas).

    I was talking about it with some of the gurus at our local retro meetup last night. He isn't familiar with X68000, but is very familiar with the CPU from troubleshooting Amiga systems, and gave me some things to explore next.

    At present, all signs point to a busted logic chip, or a broken solder joint or trace somewhere Maybe a discrete transistor.

    I'm hopeful! I'll be doing some Youtube uploads once I get further along, and will definitely post updates on here!

    Stay tuned! :D

    --- Ezycom V2.15g0 01FD0295
    * Origin: >> Pool's Open - The RetroSwim BBS (21:2/121)
  • From paulie420@21:2/150 to Retroswim on Thursday, May 15, 2025 21:50:09
    Awesome - pretty sure I'm subbed and will keep an eye peeled. :P

    Last week I began the task of recapping, but also took the opportunity
    to probe around with the ol' oscilloscope.

    I've verified the CPU is good, the clock crystals all work, and the ROM BIOS is working at least to an extent.

    Something is halting activity, even though the CPU comes out of, and remains out of reset. The 68000 itself has some other signals that can cause this, related to how the CPU can release the bus to peripherals (e.g. when you use accelerators in Amigas).

    I was talking about it with some of the gurus at our local retro meetup last night. He isn't familiar with X68000, but is very familiar with the CPU from troubleshooting Amiga systems, and gave me some things to
    explore next.

    At present, all signs point to a busted logic chip, or a broken solder joint or trace somewhere Maybe a discrete transistor.

    I'm hopeful! I'll be doing some Youtube uploads once I get further
    along, and will definitely post updates on here!

    Stay tuned! :D

    Will be watching...



    |07p|15AULIE|1142|07o
    |08.........

    --- Mystic BBS v1.12 A49 2024/05/29 (Linux/64)
    * Origin: 2o fOr beeRS bbS>>20ForBeers.com:1337 (21:2/150)
  • From Retroswim@21:2/121 to paulie420 on Tuesday, May 27, 2025 20:00:10
    Will be watching...

    Project is on hold for a little while, as I'm moving house. But to provide an update: I was able to verify the integrity of the ROMs and the CPU. The interconnecting ribbon cables between the motherboard and IO board seems OK, but the connector on the IO board side may be sketchy.

    I've bought one of these RasPi Pico based logic analyzers to try out. 24 channels per unit, daisy chain-able, up to 100MHz, plenty for this system!

    https://github.com/gusmanb/logicanalyzer

    Once I'm set up in my new place, I'll have a better workspace to lay everything out and get stuck back into it.

    --- Ezycom V2.15g0 01FD0295
    * Origin: >> Pool's Open - The RetroSwim BBS (21:2/121)