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AFAIK MacOS was just another UNIX, and in UXIX writing to a serial port was just writing to a file. Are you telling me MacOS had no shell scripting capabilities to write to a file via the command line? Even MS-DOS could do that.

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Mac OS X is a UNIX (of sorts). Mac OS classic (as in the article) is most definitely not.

So that version of MAcOS had no possibility of some command line shell scripting?

There was no command line at all.

Brings back memories, but you'd have to install a programming environment, e.g.:

- https://en.wikipedia.org/wiki/Macintosh_Programmer%27s_Works...

- http://www.think-pascal.org/#SetUp

- https://en.wikipedia.org/wiki/THINK_C

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