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posted by martyb on Sunday October 07 2018, @01:14PM   Printer-friendly
from the have-you-ever-programmed-a-6502? dept.

Adafruit visited the history of the LOGO "turtle graphics" language not long ago.

Now on Twitter, folks have found the source code for the LOGO program used on Apple II computers. Source on GitHub.

It turns out that the program was written on a DEC PDP-10 minicomputer running the Incompatible Timesharing System (ITS).

I'd take it that the code is in 6502 assembly and the program works the whole Apple II memory map for functionality. Did ITS have a 6502 cross-compiler or did the MIDAS program have separate target environments?

Very interesting programming archaeology – see the source code yourself along with the full PDP-10 ITS image still maintained today.

-- submitted from IRC


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  • (Score: 0) by Anonymous Coward on Monday October 08 2018, @07:56PM

    by Anonymous Coward on Monday October 08 2018, @07:56PM (#746109)

    I recall programming Apple IIe computers in LOGO in early high school.
    It was such a powerful experience because the language was high level and new commands you defined stayed resident in memory to build upon using newer commands. Very interactive. The one drawback was knowing when to quote a variable and when not to. It seemed a little arbitrary and error prone. Later in life, I found out that LISP which inspired LOGO has the same problem.