As a little piece of trivia,
Matthew Broderick's home computer was an
IMSAI 8080, a clone of the
Altair 8800. It was released in 1975, and it cost $438 in kit form, and $631 pre-assembled.
As standard, it had 256 bytes of memory. In all probability, it was chosen for the film for its looks - as with the Altair, it is a rectangular box festooned with toggle-switches and lights. In reality, Matthew Broderick's character would probably have been armed with an Apple II.