12 Mar
2000
12 Mar
'00
1:47 a.m.
I finally finished testing out all the memory boards in my two HP2100's. I
was getting misleading results for a long time due to my lack of
understanding of the way the memory subsystem operates - it has to be tested
in a very specific non-intuitive (and undocumented) way. Turns out I have
four bad boards; three 8K SSA core stacks and one 16K ID board.
These two systems ran HP2000 Access TSB, and had 32K each. My question is
(before I spend time hunting down replacement boards) does anyone know what
the memory requirements for the main and IOP cpu's in 2000Access is? If I
can get by with less than 32K in each cpu I can forgo getting replacement
boards for the time being and perhaps run with 24/16.
Any ideas?
Jay West
13 Mar
13 Mar
8:26 a.m.
"Jay West" <west(a)tseinc.com> wrote:
These two systems ran HP2000 Access TSB, and had 32K
each. My question is
(before I spend time hunting down replacement boards) does anyone know what
the memory requirements for the main and IOP cpu's in 2000Access is? If I
can get by with less than 32K in each cpu I can forgo getting replacement
boards for the time being and perhaps run with 24/16.
Based on study of the source code, I'm fairly sure that 2000 C' requires 32K
for each procesor; on the IOP it's mostly used for buffering. It's hard to
believe that 2000Access would need less.
With source, it should be possible to generate IOP code that supports fewer
ports and needs less memory. Without source, forget it.
10:29 a.m.
New subject: HP 2000 TSB question - additional info
Eric wrote...
Based on study of the source code, I'm fairly sure
that 2000 C' requires
32K
for each procesor; on the IOP it's mostly used for
buffering. It's hard
to
believe that 2000Access would need less.
With source, it should be possible to generate IOP code that supports
fewer
ports and needs less memory. Without source, forget
it.
I was just digging through the dusty recesses of my basement documentation
corner, and came across a handwritten note from some kind soul way in the
past (actually scribbled on the back corner of another document) alluding
that the main processor does in fact need 32K. However, the same note
appears to say that the IOP can have anywhere from 16 to 32K. Of course, a
hand written note isn't the same as an HP configuration manual :). So it
sounds like IOP memory requirements at least are still somewhat up in the
air.
On a related note, the IOP needs special firmware for the 2000 Access
configuration. The only way you can put those roms into the IOP is on the A2
card, which would mean you have to take the floating point option out. So
does anyone have a reading on which processors need FPP and FP options for
2000 Access, or if either of those options are needed at all?
Thanks in advance!
Jay West
9051
days inactive
9052
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eric＠brouhaha.com -
west＠tseinc.com