Voltages on older PCs
jhs at berklix.org
Thu Jul 24 13:47:27 UTC 2008
Hi hardware@ (cc Gary & Michael)
Comment welcome before I return a FreeBSD-7.0 host to service,
(taken away for analysis after it fell off line a few times).
I've long since rebuilt world, (still 7.0-REL), & built a few needed
ports/, but much reduced ports/ than before, Many less auto start
processes load from local/etc/rc.d & especially, no mailman, (cos
I've seen thrashing from mailman on FreeBSD before).
I'd checked temps long since too, with a real probe, not BIOS, they're OK
(& the normal remote site has good power & very cool )
Checked Volts last night (Yes AT style 2 adjacent 6 pin connectors):
PIN COLOUR NOMINAL Slim Test
P9.[4-6] Red +5 +5.14V +5~
P9.3 Green -5 +0.282V -5~
P8. P9. Black 0 - -
P8.4 Blue -12 -11.94V 0.56
P8.3 Yellow +12 +11.9V +12.3
P8.2 Purple +5 +5.11V +5
P8.1 Grey ? +2.4V +5
P8.1: OTS book says: "Power Good" but no V. is specified.
Slim: The remote server in question
Test: For comparison: Open frame pentium I test cards with.
I recall some old PCs needed an extra negative (-5 or -12 ?), for
RAM refresh, (& another also -12 for proper RS232, though rarely
if ever did PCs use more than 0/5 on cua/tty, thus not Real RS232),
but that some negatives got abandoned on some m. boards as no longer
needed (I think refresh requirements changed).
Curious thing is these 2 boards both run, but with different low
voltage pins. Can anyone cast insight ? If not, I'm inclined to
shrug & return server to service (where it's largely a backup anyway,
not domain critical).
Thanks for any insight,
Julian Stacey: BSDUnixLinux C Prog Admin SysEng Consult Munich www.berklix.com
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