Entex

So, what the heck is it? From Jeff Adventurevisions correspondence with the owner of Entex (with an interesting digression):

MAC Was a computor for children intoduced before MS DOS .
Entex made the first MSDOS computor
called Envision before IBM but had to remove it from the market as the
gurus predicted PCs had no future.
This would have been true if the phone cos had been on the ball with an
advanced web. and the ability to cope with the demand ,which is not yet
the case. This is a very long story.
We tried to create a Lan. in 1972 but the phone lines could not handle
the transmission in many states.

Very best wishes,
(Entex guy)

Actually, that seems to have little to do with the MAC Im talking about- the goofy red toy.

The programs were on little cards (I guess) and there were no cartridges.
Its native recognizable modes include annoying and obnoxious.
Seriously they include Piano and Organ.
I havent tried very hard to figure out what the other programs are,
but Im sure they involve the mode button, as there seems to be no provision for storage/cartridges.
MAC Computer pic#1
MAC Computer pic#2
MAC Computer screen shot
The screen has both led lights (a 4x4 matrix) and LED calculator type display.