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  1. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    I was trying to figure out how to get the Mindset...

    I was trying to figure out how to get the Mindset MAME to work.. but I'm not really sure what I'm doing there. Used to the arcades.
  2. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Okay, So I decided to switch to the other...

    Okay,

    So I decided to switch to the other Mindset and play around some with that. First of all, its horizontal sync seems to be better than the first one. Instead of getting wavy blue screens...
  3. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Actually.. I think I see why this is happening. ...

    Actually.. I think I see why this is happening. Looking closely at photos.. it appears the track from the cap to pin 3 is missing? Maybe the first batch of boards was erroneous?
  4. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Interesting. Well, let's give it a try, shall we?

    Interesting. Well, let's give it a try, shall we?
  5. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Yeah, there's definitely something going on here....

    Yeah, there's definitely something going on here. I just checked 8bitguy's video on the Mindset, because it has some high res shots of the area - and again, that cap is disconnected.

    57377
    ...
  6. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Interestingly - if you look closely at this pic...

    Interestingly - if you look closely at this pic of what appears to be another Mindset on Old-Computers - it also has a piece of tape blocking that cap off at one end.
  7. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Nice catch on that photo Dave! I was very...

    Nice catch on that photo Dave! I was very tempted to desolder one end and see what happened.. but I wanted to investigate more before resorting to surgery. Perhaps on that particular board the cap...
  8. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Yes I have two of those units with the fader. ...

    Yes I have two of those units with the fader. One I plugged in developed a bad smoking habit and tagged out, but the other is fairly new and seems to power up okay. My read of the video production...
  9. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    What I see for the sound controller 8042 is pin 2...

    What I see for the sound controller 8042 is pin 2 is connected to one side of 12mhz XTAL (Y2), and pin 3 is connected to both the other side of the same XTAL as well as one side of this little cap...
  10. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Yeah, I've got a bad feeling this is maybe the...

    Yeah, I've got a bad feeling this is maybe the custom video chip. Interstingly, the half of the RAM that isn't clocking or doing anything is right beside it.

    It's like the sound chip - there's...
  11. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Yeah I kind of suspect. It'd be rare for two...

    Yeah I kind of suspect. It'd be rare for two machines to have exactly the same fault.. unless it's a weak link common to both.

    The manual I read was specific to the 'video production' variant. ...
  12. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Sure. Soon as the magic smoke clears from my...

    Sure. Soon as the magic smoke clears from my office. Apparently I forgot about a RIFA cap. My god.. what is in those things!

    I' would have thought interlacing would be mentioned in the...
  13. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    One other thing I've noticed.. in pictures of...

    One other thing I've noticed.. in pictures of other Mindsets I see the power supply fan plugged into the center of the motherboard. On both of mine.. it is plugged into J13, right next to the PSU. ...
  14. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    No.. I think I have almost every Commodore...

    No.. I think I have almost every Commodore monitor except that. I have only two vintage PC compatible monitors.. my 5151 and the 5154.

    Thing is.. the composite shouldn't require anything funky,...
  15. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Unfortunately I don't have an NEC multisync…...

    Unfortunately I don't have an NEC multisync… right now I am using an IBM 5154. Not sure if that would be a problem.
  16. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    Yeah. It's strange how both machines i have...

    Yeah.

    It's strange how both machines i have are the modified video production variants, and both behave exactly the same way, either producing screens like above or nothing at all on power up. ...
  17. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    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.
  18. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    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...
  19. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    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...
  20. Replies
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    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...
  21. Replies
    30
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    1,527

    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...
  22. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    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...
  23. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    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......
  24. Replies
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    Views
    1,527

    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...
  25. Thread: Mindset repair

    by falter
    Replies
    53
    Views
    640

    No totally different connector. I had to...

    No totally different connector. I had to manually run wires point to point.
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