18 May
2006
18 May
'06
6:19 p.m.
Question on a local newsgroup about PC power supplies and whether the -5V rail
is used any more, and it's prompted me to wonder what it was *ever* used for?
Did the original IBM PC make use of -5V for any reason? Or is its inclusion
maybe a hang-up from earlier machines that used three-rail memory devices?
Rememebr the _original_ PC -- the one with the 16-64K motherboard did use
3-rail RAMs (4116s) IIRC. And I think the CGA card did as well.
-tony