< Actually, I'm wondering how those things work. Do they read the POST
< code off the motherboard, or do they do their own diagnosis? I've
< looked at the ads in various magazines, but never thought it had
< much potential.
POST is in reality a dumb I/O port with a two digit display. The BIOS
power up self test writes codes to it depending on errors or success.
It allows a bit more informative display if the video board or tube is
croaked. Generally I can trouble shoot without one using known good
boards as swaps.
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