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  1. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    Here is the output on composite now and again:...

    Here is the output on composite now and again: 57359

    And from RGB: 57360

    Really hoping the video chips aren't toast. They are unobtanium.
  2. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    It doesn't? This is a beeper/speaker isn't it? ...

    It doesn't? This is a beeper/speaker isn't it?

    57349

    I kinda wish I had a working one to compare to. I've been trying to devise a way to see if it's actually alive - sort of like the Kings...
  3. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    Hmm. So I have an 8042 which according to the...

    Hmm.

    So I have an 8042 which according to the manual is the aound generator. It has a crystal connected to its pins 2 and 3, and one of the pins goes into a small cap of some kind. There is no...
  4. Replies
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    67

    Ohio Scientific - Space-COM?

    Found this brochure amongst some stuff a seller included when I bought a blank 540B board:

    57321

    The seller's note says the board was purchased and shipped in the box he sent me from Space-COM...
  5. Replies
    30
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    1,390

    Yeah I've reseated everything, and tested every...

    Yeah I've reseated everything, and tested every chip I could in my Tandy 1000EX... so far they all come back just fine. I hate that everything else is soldered - I have some suspects but it would...
  6. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    Okay so, a bit more testing done. I started...

    Okay so, a bit more testing done.

    I started probing the BIOS ROMs. What I'm noticing is, each time I power up, it's different. Sometimes I can see activity on the address lines on power up, and...
  7. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    So I did some more digging - the keyboard does...

    So I did some more digging - the keyboard does appear to be communicating with the computer. I can see Reset on the mainboard when I push that, I can see activity whenever other keys are pressed......
  8. Replies
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    1,390

    Yeah.. I'm not really sure what's going on with...

    Yeah.. I'm not really sure what's going on with this thing. What I know so far is that regardless, there is always a loud tone on power up. Sometimes I can see activity coming from the BIOS ROM...
  9. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    No totally different connector. I had to...

    No totally different connector. I had to manually run wires point to point.
  10. Replies
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    1,390

    Borrowed my Tandy's PSU to try some diagnosis on...

    Borrowed my Tandy's PSU to try some diagnosis on my Mindset, and then got to looking at the motherboard again and discovered this:

    57249

    I'm not sure if a cap can still work properly like...
  11. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    I hooked up the PSU from my Tandy 1000 (the...

    I hooked up the PSU from my Tandy 1000 (the working PSU), and checked all voltages on power up.. got a solid +11.91V, all the other voltages look great.. computer powers up.. but.. yeah. Zero. Just...
  12. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    Yeah I waited it out a good 2 minutes on both.....

    Yeah I waited it out a good 2 minutes on both.. nothing.. just black screen. I've got a Phinog PSM-763 PSU from a dead Commodore PC10-III that has the same connector as the Mindset.. I'm trying to...
  13. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    Hmm... so I'm reading the service manual for the...

    Hmm... so I'm reading the service manual for the Mindset, and it's saying that on power up, the screen goes blank, and it does a series of tests, *before* going to the init screen. So I'm wondering...
  14. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    Oops. I may or may not have plugged in the...

    Oops. I may or may not have plugged in the keyboard while the unit was plugged in. I can't remember.

    It's odd that both machines suffer the exact same issue.. so that's got me wondering if it is...
  15. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    You know, come to think of it.. I wonder if maybe...

    You know, come to think of it.. I wonder if maybe the whole video production thing is part of my problem. Both of these machines were specifically modified for video production - they have little...
  16. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    How did you do that? Thanks Al! Is this...

    How did you do that? Thanks Al!

    Is this already captured somewhere? Hopefully if not I've added to the base of software.
  17. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    I dumped the ROMs on the 'mystery cart'. I don't...

    I dumped the ROMs on the 'mystery cart'. I don't see a lot I recognize but on the fourth ROM I see stuff that looks somewhat English. Maybe the GWBASIC cart?

    Anyway here they are -- too large to...
  18. Thread: Mindset repair

    by falter
    Replies
    20
    Views
    397

    Mindset repair

    So thanks to Thomas Raguso, I finally got my hands on a Mindset keyboard yesterday (which came with another Mindset..). So I thought I'd just quickly try a power up self test. I don't have an...
  19. Replies
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    32,066

    Oh wow.. I hadn't seen those pictures. Redmaus -...

    Oh wow.. I hadn't seen those pictures. Redmaus - you are a cad, sir.

    I really wish there was a way for us computer collectors to cut off deskthority's supply of this stuff. Personally any time...
  20. Replies
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    1,240

    Ok. I thought it was ground, because the other...

    Ok. I thought it was ground, because the other side of the 'shield' is conductive, and it has an actual wire bolted to it (green) that runs up to the motherboard and is connected to ground.
  21. Replies
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    1,390

    I was playing around with this some more...

    I was playing around with this some more yesterday while waiting for my 100's motherboard to dry from my cleaning efforts.

    I got a 1000 keyboard finally and plugged it in. Interestingly, on first...
  22. Replies
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    1,240

    Thanks Dwight et. al. I've been working to...

    Thanks Dwight et. al. I've been working to remove and where necessary replace components rusted by the aforementioned battery leak. I'll let you know when I get to your experiment Dwight.

    I have...
  23. Replies
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    32,066

    I can't speak for 68k but for myself, I'm not mad...

    I can't speak for 68k but for myself, I'm not mad with deskthority guys - just frustrated with the situations that arise. When you have a rare computer like the Mindset, say, and you know there's...
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    MEK6800D1 on Ebay

    I ended up with two of these.. selling this one.
    ...
  25. Replies
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    167

    Did I lose this because DEC?

    Have been trying to find an original MP-L card loose for eons. Thought I was safe at $150, despite that annoying third place bidder who is all over anything SWTPC. But we both got trumped by...
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