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I purchased this 1979 TI 99/4 (not the more common 99/4A) from a VCF, and when I got home I noticed a sticker declaring it was an engineering prototype, not to be sold, and then the words "SOLD AS IS" factory etched into the case.
I opened up the computer and got to the motherboard today and didn't really see anything out of the ordinary, but I wouldn't know. I'm losing confidence this really is some kind of engineering prototype.
Does anyone have elite TI knowledge they can impart that may answer why this computer was labelled this way? I can't get to the bottom of it. Mostly curious if it really is unique in any way. Any information is appreciated.