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Thread: Unique S-100 computer (Z-80/Vector Graphic/Micropolis)

  1. #191

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    I will try the other disk images. In the meantime, here are some closeups of the controller board - can you tell which mods have been done?

    20200601_211452.jpg 20200601_211504.jpg 20200601_211525.jpg

    20200601_211535.jpg 20200601_211541.jpg 20200601_211546.jpg

  2. #192
    Join Date
    Dec 2005
    Location
    Toronto ON Canada
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    7,350

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    Interesting; are these FDC mods documented somewhere?

    TIA

  3. #193

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    Quote Originally Posted by MikeS View Post
    Interesting; are these FDC mods documented somewhere?
    The mods are documented toward the end of the floppy controller manual here: https://deramp.com/downloads/vector_...Controller.pdf

    Mike

  4. #194

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    Quote Originally Posted by nullvalue View Post
    here are some closeups of the controller board - can you tell which mods have been done?
    It looks like the motor on/off mod and the ready mod are both implemented, so that's not the problem. Let me know what happens when you try the other disk images.

    Mike

  5. #195
    Join Date
    Dec 2005
    Location
    Toronto ON Canada
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    7,350

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    Quote Originally Posted by deramp5113 View Post
    The mods are documented toward the end of the floppy controller manual here: https://deramp.com/downloads/vector_...Controller.pdf

    Mike
    Thanks again, Mike!

  6. #196

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    Quote Originally Posted by deramp5113 View Post
    It looks like the motor on/off mod and the ready mod are both implemented, so that's not the problem. Let me know what happens when you try the other disk images.

    Mike
    I know I tried the other images before with the same results. But now I'm not making any progress writing disks again. It starts accepting data over XMODEM, hits the first write block, the drive spins and clicks a few times (never did this before) and then write fails. Will keep playing with it.

  7. #197

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    So something happened the other day I was hoping was unrelated but maybe it was.. I had a probe hooked to the drive board, went to roll my chair and poof something sparked, blew a fuse on the drive's power supply. Ugh.. replaced the fuse, everything seemed to be working fine. I swear I even had it "attempting" to write again after that, but I can't remember now. What should I be looking for? again.. Before it would go to write, the head would advance and it would at least think it was writing data. Now its like I'm back to square one where it goes to write data, but then fails..What got that to work before was swapping the head connectors on the board.. double checked that.. tried both drives, tried swapping the drives physically, too. The head snaps down now, it clicks a few times - then fails to write.
    Last edited by nullvalue; June 3rd, 2020 at 06:02 PM.

  8. #198

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    You mention, "went to roll my chair..." Did you end up pulling off a probe that shorted against something and "poof something sparked," or without being disturbed, did something go poof? If the latter, it's probably just a tantalum capacitor that died initially in a shorted condition that blew the fuse, but then finished open after it burned. If a probe or something caused a short bad enough to cause a poof and a spark, then that will be much harder to find as an IC or component or two is probably damaged.

    Mike

  9. #199

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    Yeah meant to say, when I rolled the chair, the probe was tangled around the arm and yanked the probe. I didn't exactly see if there was a spark as I had looked away. When I say poof I was referring to the fuse. I know, I'm not giving you much to go on.

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