Electrical Network Interactive Analysis Console
and the Eniac Extension language
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The MacTronic

Mactronic is the ancestor of Eniac.
It ran on an old Macintosh II. I still have a copy of executable and source on a 800k floppy, but I no longer have the hardware to be able to read it (DOS floppy driver cannot read old MAC floppy, because they have a fixed radial speed while the MAC drivers had a variable one) and perhaps, after all these years, the disc becomes unreadable.
It was written in Think C, and I reuse parts of its algorithms in Eniac, because I still have a partial printed copy of the sources.

In the pictures there are some screenshots from MacTronic.

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