IBM MCGA Gate Array Reverse Engineering

 (github.com)

53 points | by userbinator 1 day ago

4 comments

  • fredoralive 1 day ago
    It’s interesting that the gate arrays are supplied by Seiko, and the only known MCGA systems apart from IBM are from Epson. The bit of Seiko that made the gate arrays appears to be… Seiko Epson. So is it a coincidence? Sub-licensing? Skullduggery?
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    • andrewshadura 20 hours ago
      Not sure what you're trying to say. The full name of Epson is Seiko Epson.
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      • fredoralive 19 hours ago
        Seiko can cover a fairly large group of companies, Seiko Epson is a particular subgroup of it (now somewhat detached from the main group).
  • bananaboy 22 hours ago
    Wow this is amazing work!
  • bitwize 1 day ago
    A fucking built-in genlock? For years I thought only Amigas had those!
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    • ggm 1 day ago
      Put on the die, but only expose on the $$$$ builds using it?
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      • skissane 20 hours ago
        Maybe it's buggy or something? Unreliable? Use causes overheating or RF interference issues?

        Maybe IBM added it for project X, and then project X got cancelled, and everyone else forgot it was ever there...

      • fredoralive 1 day ago
        The article mentions that it is brought out to the connector, multiplexed with the monitor ID pins.
  • pavlov 21 hours ago
    [flagged]