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ClausB

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Everything posted by ClausB

  1. ClausB
    Could they make a decent case for a 400, which has all flat sides?
  2. ClausB
    Very thin coat of solder might work. Older RAM boards were 'tinned' this way. They do corrode more quickly than gold and need reseating or cleaning, but carts get swapped in and out more often than RAM.
  3. ClausB
    I don't recall. Maybe we used whatever FJC's video recommend.
  4. ClausB
  5. ClausB
    A little 3D wireframe animation:
  6. ClausB
    Star Raiders! Oh, wait...
  7. ClausB
    They might have lowered prices on the 400 and 800 sooner to slow the success of the VIC20.
  8. ClausB
    Yes. It doesn't matter unless you're replacing faulty DRAM chips.
  9. ClausB
    Could they be Freddie chips? Or maybe PIA chips for banking?
  10. ClausB
    Gotta look at the data sheet.
  11. ClausB
    No, the 7-bit ANTIC would only refresh half of a 256 cycle DRAM, so the other half would fail.
  12. ClausB
    128 cycle 64K DRAM chips are more compatible because some 800XLs have the older ANTIC with 7 bits refresh addressing.
  13. ClausB
    The photos show it's stuck on luma value 9. I doubt it's the 4050. More likely it's saturated luma at the HDMI converter which is expecting a lower voltage range than the 800 provides. A simple test to vindicate the 800 is to try the RF output on a TV which accepts the old analog standard. A possible workaround is to wire a pulldown resistor to the 800's luma output. Maybe 75 Ohms to ground.
  14. ClausB
    Have you tried adjusting contrast and brightness on the monitor? It appears that the luma signal is saturated.
  15. ClausB
    Any luck with this? Another trick we use with those tinned card edge connectors is to run an eraser over them to remove the dark corrosion. Looking forward to seeing it on your excellent YT channel.
  16. ClausB
    Get Star Raiders or go home!
  17. ClausB
    Required accessories:
  18. ClausB
    Can I argue that the 400 keyboard does have slight tactile feedback? Raised key edges help the finger locate. Speaker click is felt in the fingertip.
  19. ClausB
    Here is a technical article about the differences. https://atarihq.com/danb/files/52analog.txt
  20. ClausB
    eBay baby! 4-port with no PS switch box nor controllers. Had to clean it up and modify it to separate power and RF.
  21. ClausB
    ?
  22. ClausB
    Would it be easier to make a spacer to go between the 1050 top and bottom than to make a whole case?
  23. ClausB
    Would it fit in a 1050 case?
  24. ClausB
    7408 at C12 and 74174 at C7 are also part of the cursor circuit.
  25. ClausB
    The difference between P and 0 in ASCII is 20 hex (likewise @ and space), so look for problems with data line D5. Is the video RAM divided up into bits? If so, there may be a bad RAM chip. Those are old shift registers, maybe hard to get. Is your Apple I original or a replica? Edit: Normal cursor function is to flash between @ and space, so maybe the problem is in the cursor circuit.
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