Recent content by emuboy

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    LC III, happy boing, no video output

    Well, WTF. I just soldered that jumper and it started to work, what are the chances? thank you very much Doug, you have been incredibly helpful!
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    LC III, happy boing, no video output

    TX: *T000100010001RX: *ERROR**T TX: *R RX: 000020000000*R TX: *T000200010001 RX: *ERROR**T 000020000015*R TX: *T000500010001 RX: *ERROR**T 000020000015*R TX: *T000600010001RX: *ERROR**T TX: *RRX: 000020000000*R if I'm not mistaken I have a data line 13 problem.
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    LC III, happy boing, no video output

    good plan, I will try that
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    LC III, happy boing, no video output

    New clue. the external ram will always give a sad mac, still no video, I tried 6 different ram sticks, all tested fine, plus the one the machine came in, at this point i'm almost tempted to swap the ram on the logic board as there might be a dodgy chip.
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    LC III, happy boing, no video output

    no, I do have a pram battery which is new, but no dice.
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    LC III, happy boing, no video output

    right, good point, my bluescsi blinks only once, so that's probably the system crashing after boot, I'm wondering, would a bad ROM cause this? I don't see any particular damage on the PCB, I scoped the ram and everything looks in place?
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    LC III, happy boing, no video output

    I did try the LC II vram, I added another stick of ram but no changes, there was cap juice on the board, but no corrosion, I will test the RAM lines, see what we get.
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    LC III, happy boing, no video output

    Ok, I will search that area, but I thought that a good boing was a symptom of good ram? I which it would crash, so I could drop into the debug serial test
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    LC III, happy boing, no video output

    Hello! For Marchintosh I managed to score an LCII and LCIII, while the II was a quick fix with new caps, this one it is definitely not, provided same cable,same PSU and same setup of the LCII i get an happy boing but no video, I get nothing at all, no h/v sync or colours, the scope show some...
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    I designed a Bluescsi v2 DB25 case that doesn't fall apart.

    Oh you mean brass inserts, no, you can add them but you will need to enlarge the holes to your need.
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    I designed a Bluescsi v2 DB25 case that doesn't fall apart.

    Inserts? For what ? It's two halves screwed together
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    I designed a Bluescsi v2 DB25 case that doesn't fall apart.

    Go grab it, have fun! https://www.printables.com/model/934800-bluescsi-v2-db25-sturdy-case
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    Macintosh Classic, no power at all

    No power could be anything, from a fuse to a dead transformer, I would check what voltages do I have and follow the schematics for starter.
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    Macintosh Classic, no power at all

    I would say, the second analog board seem to have voltage issues, I would test the 5v and 12v on the hard drive molex as a starter, then take it from there.
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    Macintosh Classic, no power at all

    it might be the logic board? is it recapped?
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