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dcr

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  1. dcr

    Apple 800K External Drive

    Okay, so M0131 is called the Macintosh 800k External Drive but does not have "Macintosh" anywhere on the drive or label?
  2. dcr

    Apple 800K External Drive

    The one I have is Model No. M0131.
  3. Is the Apple 800k External Drive the same as the Macintosh 800k External Drive? Wikipedia only has a little information on it and there's no mention of the Apple 800k External Drive, only the Macintosh 800k External Drive and doesn't have a photo of the bottom. So I'm wondering if they are the same. I would sort of expect it to have Macintosh on the label but maybe not.
  4. dcr

    Self-Contained POTS System?

    Thanks for all the info. I hadn't posted again as I didn't have anything to add, but I have followed the thread with interest and this project is still something I hope to do someday. Not in the immediate future as it appears to be more complex than I had hoped but still sometime in the future.
  5. I have a similar problem but before I go wild with the soldering iron, I thought it might be best to give some details to double-check first. I initially bought this Mac Plus with the seller saying the screen didn't work. I figured that was fine because I could always use it as a parts machine. The computer was shipped to me and, upon arrival, I gave it a test boot just to check things out. The machine gave a boot chime. I tested the brightest control and found it was at the lowest setting. Once I adjusted the brightness, the screen was fine. Some time later, when I booted, the screen didn't display. I tapped the side of the machine and the screen came right on. I figured something must have been loose and shipping the machine shook it into place but after sitting for a while maybe it came loose again. It worked that way for a while; if the screen came up bank, just tap the side and it displayed like normal. Today, tapping the side only makes the screen work when I tap it. It doesn't stay on like before. Will resoldering Pin 1 as described in this thread fix that or do I need to be looking elsewhere? Or should I resolder all the connections on the analog board? Thanks!
  6. dcr

    Simasimac SE/30 Diagnosis

    Does anyone have a link to a closeup image(s) of broken/rotted traces? The ones I found in a search weren't very informative. I looked the board over with a magnifying glass and didn't see any obvious trace problems but I'd like something to compare to to make sure I'm not overlooking more subte details that might be indicative of a problem.
  7. dcr

    Simasimac SE/30 Diagnosis

    This is the one I bookmarked: https://www.amazon.com/dp/B01J5EX300/
  8. dcr

    Simasimac SE/30 Diagnosis

    Thanks. I found one on Amazon and added it to my private wish list. I took a hot air gun to the board to see if remelting the solder connections would have any effect. It didn't. Some of the legs (on the sides facing the caps) on UE8 and UI12 look dirty or possibly corroded. Maybe this weekend I can try cleaning them and looking at that with the magnifying glass to see if any of the legs are broken due to corrosion. Doesn't appear that way now but who knows what could be going on close up.
  9. dcr

    Simasimac SE/30 Diagnosis

    I don't have a tester. Are there affordable ones? The one I found in a search on Mouser was $1,225.00.
  10. dcr

    Simasimac SE/30 Diagnosis

    Yes. I'll try to get one tonight or tomorrow. It's basically 8 columns of floppy, 8 columns of gray, 8 columns of floppy and 8 columns of gray.
  11. dcr

    Simasimac SE/30 Diagnosis

    All looked good but one did push in a little further when I pressed on them as a double-check. They are all securely seated now and appear to have good contact. I can't see anything wrong around UE8. The soldering connections seem less shiny than its neighbors, but the traces appear intact and the solder does not appear loose. When booting, I do now see a partial blinking floppy icon so I imagine the component I was able to push in further was a culprit there. Still have the same screen appearance, except now for the partial floppy displaying.
  12. dcr

    Simasimac SE/30 Diagnosis

    Will do. I've examined them previously and they seemed to be seated properly but I'll double-check when I check around UE8. Thanks!
  13. dcr

    Simasimac SE/30 Diagnosis

    I moved the RAM around to see if it made a difference. It didn't. Where do I need to examine the traces to try to hunt it down? What does the component at Q3 do? It looks sorta iffy to me.
  14. dcr

    Simasimac SE/30 Diagnosis

    That's how the screen looks throughout startup. No icons appear.
  15. dcr

    Simasimac SE/30 Diagnosis

    Here's what the screen looks like:
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