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About ClausB

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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. You're welcome to use any of this code for Epson graphics:
  2. The prototype PET had a similar rounded design which did not survive to production.
  3. Which article was that? Sure, I'll help.
  4. That 256K board might be a David Byrd upgrade.
  5. Looks like that 74HC373 latch has 6 output bits wired, so it's probably 64 banks of 16K.
  6. The 2600 version is a far cry from the original, which, in 1980, was more spectacular than even arcade games.
  7. Cut a cross with a sharp razor blade over each screw hole so you can cover the screws again later. I bought a RAMCRAM for my 400 in 1981. Later I got another one and upgraded it to 128K for my 800.
  8. Cool JS emulators for the TI-57, TI-55, and TI-42 MBA: https://www.pcjs.org/blog/2017/11/05/
  9. The truth is out there.
  10. Yep, but as Rybags said, ANTIC refreshes in about half that time.
  11. 41xxx was a standard part number for bit-wide dynamic RAM. Some manufacturers used 42 or 81 or other numbers. Some had extra features that Ataris didn't need. The xxx gives the size in K bits: 4116: 16 Kb 4164: 64 Kb 41256: 256 Kb All these came in 16-pin DIPs with 13 pins compatible, making upgrades fairly easy.
  12. Peroxide was not abandoned in rocketry. The Soyuz rocket, for one, still uses it. The Komet was abandoned for rather larger reasons!
  13. I agree the OP should install a 1MB (megabyte) upgrade. That's a whole lot more memory than 1mb (millibit)!
  14. This will be #4 on the list. Looks like it was almost a 948! More here:
  15. Right. PDI educational titles made much use of this. Search Atarimania for PDI. When I worked there I had a tour of the tape duplicator's factory. I recall a large spool of tape with many copies of the master duped at high speed. There was a special audio cutting signal marker in between each copy for the machine that fed the cassettes. Also I sat in on a recording session with a professional voice actor who happened to be my sister.
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