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ClausB

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    Michigan
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    space and rocket history, astronomy, photography, math, computer programming, physics, digital electronics, Atari, aviation, sports cars, Star Trek, Star Wars, Doctor Who, my family, to name a few

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  1. Yes. It doesn't matter unless you're replacing faulty DRAM chips.
  2. No, the 7-bit ANTIC would only refresh half of a 256 cycle DRAM, so the other half would fail.
  3. 128 cycle 64K DRAM chips are more compatible because some 800XLs have the older ANTIC with 7 bits refresh addressing.
  4. 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.
  5. Have you tried adjusting contrast and brightness on the monitor? It appears that the luma signal is saturated.
  6. 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.
  7. 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.
  8. Here is a technical article about the differences. https://atarihq.com/danb/files/52analog.txt
  9. eBay baby! 4-port with no PS switch box nor controllers. Had to clean it up and modify it to separate power and RF.
  10. Would it be easier to make a spacer to go between the 1050 top and bottom than to make a whole case?
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