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Old 22nd Oct 2018, 2:48 pm   #10
cmjones01
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Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,669
Default Re: Retired Texas TI99/4A engineer needs help please.

I wouldn't worry about the other rails for now. Just concentrate on the +5V one since that's the one with the problem, and its circuit is radically different from the other ones (they're much simpler). Sticking my finger in the air, I'd say the +5V rail needs to be able to deliver about 2A to power the computer happily, judging by my experience of other machines of the era. It might be somewhat less, though.

Chris
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