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ClausB

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Everything posted by ClausB

  1. ClausB
    R46?
  2. ClausB
    Have you tried other values for R51? The 800 has 0 Ohms there, right? A quick test would be to short R51 with clip leads.
  3. ClausB
    Not even with brightness and contrast adjustments on the monitor?
  4. ClausB
    Your future is so bright, you gotta wear shades.
  5. ClausB
    Congrats! I've not had trouble with the power supply board caps, but have seen some shorted motherboard decoupling caps, FYI.
  6. ClausB
    Of course they were working on it. Jay Miner and gang developed what became the Amiga. Not so much an upgrade as a NG.
  7. ClausB
    Should work for the 8050, but the 8051 is not in the MCS-48 family. And thanks for the link! I need a -48 burner.
  8. ClausB
    What do you mean, they don't line up? Color burst should appear after every horizontal sync pulse with fixed amplitude. Then color info of same or no amplitude and variable phase depending on the display. Can you post scope photos sampled at various points in the circuit?
  9. ClausB
    Have you traced the color subcarrier signal from the GTIA all the way through the circuit with a scope, to see where it's getting lost? Is there maybe something in the circuit that limits bandwidth below 3.6 MHz?
  10. ClausB
    You mean solder side, right? Chips should face rearward.
  11. ClausB
    Missing page 396 (continuation of "Upgrades are for everybody").
  12. ClausB
    Chips face toward the rear. Chip side is visible under the metal rear cover.
  13. ClausB
    EASMD with OS/A+ was my development system in the day. ACE80 was the largest project I did with with it.
  14. ClausB
    It works with a patched version of Letter Perfect. See:
  15. ClausB
    Wondering about the date code. Maybe it's hexadecimal? 7A, 7C, 81, 84, etc. Maybe the number of weeks since the XE line started?
  16. ClausB
    No shame at all. Atari made the best possible membrane keyboard, with raised edges for tactile feel and the speaker click which you can feel and hear for feedback. Yes, not good for touch typists, but good enough for entry level in 1979.
  17. ClausB
    What? No ROM replacement required.
  18. ClausB
    @Scooter83, would you post photos of your labels?
  19. ClausB
    Please take that discussion, any more repair notes, and other OT posts, to other threads. Thanks. Meanwhile, I've updated the sheet linked in the first post.
  20. ClausB
    @FarmerPotato, do you remember coming across any TI SR-5x and TI-5x programmable calculator documents at the library?
  21. ClausB
    Yes, that's true. Early 800s also had CTIA chips.
  22. ClausB
    Only the prototypes had 4K. Early production 400s had 8K. Later they had 16K.
  23. ClausB
    Congrats! Yes, the board in the photo does have only 32K. Why do you say it had 48K?
  24. ClausB
    Just post a photo and we'll let you know!
  25. ClausB
    Yes, good point. So is the internal ANTIC character buffer suspect?
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