12 Nov
2007
12 Nov
'07
4:27 p.m.
On Nov 12, 2007, at 1:18 AM, Scott Quinn wrote:
Oh, so the Mostek unit isn't what this is talking about. Hmm- have
to go over the board again.
I saw the Mostek and assumed that it was the same as the 4c/m/u
NVRAM setup .
Duh, I was talking about the 3/200, which (again, if I recall
correctly) used a 2816, like with most older Sun processor boards.
If the 4/300 has a Mostek NVRAM chip on it, then the proof is in the
pudding...I don't have one here anymore. (sniff)
At any rate, though, at some point in the late-Sun3 to early-Sun4
timeframe, they switched from 2816 EEPROMs to the Mostek SRAM chips
with battery backup tophats on them.
-Dave
--
Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007
Couple of questions on old Sun machines (well,
parts).
On a Sun 4300 CPU board, I'm getting the
"EEPROM Write-Write-Read-Read test
error PA=0xF2000000 VA=0X00FF8000 Exp=0x0000005a Obs=0x00000000
(looping)"
error. Looking on the Web and Usenet seems to show that this has
happened a couple of times, with some reference to possibly being
the NVRAM (although the most comprehensive posing set was in
German :(). This seems a bit odd, though - on my other Suns it
calls the NVRAM the NVRAM, so I'm wondering if this is something
else.
It's just a terminological difference. Most of those machines (if
I recall correctly) used 2816 NVRAM chips, which are also correctly
referred to as EEPROMs.