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ClausB

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Everything posted by ClausB

  1. ClausB
    Thanks for the effort. I think it looks pretty good; maybe the sunrise needs a little fixing.
  2. ClausB
    The A8's display list is a unique concept. Each scan line can be a different graphic or character mode. C64 doesn't have that. The A8's indirect color registers allow dynamic color changes from a wide palette without rewriting bitmaps. C64 doesn't have that.
  3. ClausB
    Request: SpaceX Starship launch:
  4. ClausB
    All the 44256 chips I've seen need 512 refresh cycles (9 bits). They won't work without extra circuitry to generate the extra bit. Good luck finding 256Kx4 chips with 256 refresh cycles.
  5. ClausB
    Request: album cover: Dark Side of the Moon
  6. ClausB
    Could they make a decent case for a 400, which has all flat sides?
  7. 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.
  8. ClausB
    I don't recall. Maybe we used whatever FJC's video recommend.
  9. ClausB
  10. ClausB
    A little 3D wireframe animation:
  11. ClausB
    Star Raiders! Oh, wait...
  12. ClausB
    They might have lowered prices on the 400 and 800 sooner to slow the success of the VIC20.
  13. ClausB
    Yes. It doesn't matter unless you're replacing faulty DRAM chips.
  14. ClausB
    Could they be Freddie chips? Or maybe PIA chips for banking?
  15. ClausB
    Gotta look at the data sheet.
  16. ClausB
    No, the 7-bit ANTIC would only refresh half of a 256 cycle DRAM, so the other half would fail.
  17. ClausB
    128 cycle 64K DRAM chips are more compatible because some 800XLs have the older ANTIC with 7 bits refresh addressing.
  18. 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.
  19. ClausB
    Have you tried adjusting contrast and brightness on the monitor? It appears that the luma signal is saturated.
  20. 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.
  21. ClausB
    Get Star Raiders or go home!
  22. ClausB
    Required accessories:
  23. 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.
  24. ClausB
    Here is a technical article about the differences. https://atarihq.com/danb/files/52analog.txt
  25. 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.
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