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New chess game for C64/128 GEOS (game c64 c128) (github.com)
11 points by celso 594 days ago | 4 comments
  • onre 593 days ago
    Wanted to figure out how to develop for GEOS on the C=64. Turns out there are rather many things called GEOS these days. However, if you're like me, this is the link you're after:

    https://archive.org/details/The_Official_GEOS_Programmers_Re...

    • simmons 593 days ago
      Very cool! I loaded it up and played around with it a bit.

      Huh, I didn't know about that GEOS book back when I was a kid trying to figure out how to make GEOS programs. I wrote a letter to Berkeley Softworks asking for information about how one could develop GEOS programs, and I guess someone felt sorry for me because they sent me a huge binder with a printed version of the Hitchhiker's Guide to GEOS:

      https://www.lyonlabs.org/commodore/onrequest/geos/geos-manua...

      I still have it today. Needless to say, as a kid, I had a great time reading it, making programs, and learning lots of new things. :)

      • onre 593 days ago
        My C=64 childhood consisted of BASIC, Simons' BASIC and a Finnish translation of this:

        https://www.computinghistory.org.uk/det/32184/Commodore%2064.../

        Trying things out without any preconceptions of how programming should work was quite an adventure.

    • Darkstar 593 days ago
      I like the kind of funny way this was written back then, you wont see things like this in any current (official/printed) developer documentation:

        Panic - Roll Over and Die
        ...
        (Registers) destroyed: a, x, y, r0-r15, and probably much, much more
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