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BLOG

October 4, 2018 AT 2:22 pm

The Apple II Source Code for the LOGO Language Found #VintageComputing

Apple II LOGO Language

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

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

It turns out that the program was written on a big iron Digital Equipment Corporation (DEC) PDP-10 mainframe running the Incompatible Timesharing System (ITS). The code is dated September 4th, 1980.

Lars Brinkhoff‏ found it and posted the discovery on Twitter. He received permission from the authors to post the code.

The code is in 6502 assembly and the program works the whole Apple II memory map for functionality. The code was built by a cross assembler which came from the DECUS user group and originally ran on the DEC’s proprietary TOPS-10 operating system.  It runs on ITS by way of a TOPS-10 system call emulator.

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

LSCI Logo, another LOGO implementation, was also licensed to Apple and is different from MIT’s LOGO.

** Updated with some info from Mr. Brinkhoff – thank you! **
** Updated 9/21/2021 with new links to the source directory within the repo **


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3 Comments

  1. Phil Bogle
    October 4, 2018 at 2:55 pm

    In case you want to see/relive what Apple II Logo looked like, here’s a video of it running on the Apple II GS:

    https://www.youtube.com/watch?v=mttyoaspa7U

  2. Lars Brinkhoff
    October 5, 2018 at 12:04 am

    Some comments:
    – This is MIT’s Logo, later licensed to Terrapin.
    – LCSI Logo is another implementation, licensed to Apple.
    – PDP-10 is not a minicomputer, but a big iron mainframe.

  3. Stefano Franchi
    October 5, 2018 at 4:00 pm

    Actually, the PDPs (the whole line, including the PDP-10) were indeed mini-computers. That is how they were known as and marketed by DEC. That does not mean they were small by 21st century standards. It means they were smaller and way cheaper than the truly big iron mainframe made by IBM and others. in the late 70s-early 80s the computer categories tended to be, in decreasing order of size/price: mainframe, mini, micro.

Sorry, the comment form is closed at this time.

Filed under: Programming, retro —
Tags: apple II, DEC, logo, PDP-10, programming — by Anne Barela

Comments (3)
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