1 Apr
2007
1 Apr
'07
9:19 a.m.
I had written....
> Something else caught my eye upon re-visiting that
ad. Either that
> machine
> never ran HP2000 TSB, or someone has pulled a lot more cards than just
> the
> memory.
To which Brent replied....
I'm really not familiar with the hardware
requirements for TSB but what
about
the possibility of it being the I/O processor half of a dual-processor
configuration?
Well, I am *very* familiar with the hardware requirements for TSB, and I'm
obviously insane. Ok, this is especially embarassing - since HP2000 TSB is
my specialty and also the centerpiece of my collection. OBVIOUSLY senility
has set in, probably coupled with the fact that I have focused on restoring
the DEC pieces in my collection as of late and demonstrably have forgotten
everything about my 3 beloved HP TSB machines. Perhaps it's time for an
exorcism, to have my DEC daemons cast out so I can get back to my beloved
HP2100 machines :)
Brent is again completely correct - this does seem to be a valid
configuration for the I/O processor in several different versions of TSB.
The only thing amiss to me is Brent said there were two GND TRU boards, but
I only see one listed in the auction. You would have to have two for sure as
the IPCK was always four 12566 boards with 2 on each end. One pair used for
sending and one pair used for receiving.
Wasn't there a TSB which used two 2116's, one
for computation
and one for I/O?
Virtually all TSB variants required 2 cpus. 2000B, 2000C,
2000C', 2000F,
2000F', and 2000/Access all required two cpus. 2000A and 2000E required only
one cpu. There are docs for each version stating which processors are valid
for the main cpu and which are valid for the IO cpu. I have long suspected
that those specifications are incorrect, and that the main and I/O cpu's can
be any combination. While C, E, F, and Access OS's are around - 2000A and B
don't seem to be so I'm not sure.
and the amount of memory which would be implied by the
remaining memory
module cards.
I would wager that 2000/Access makes the most demands of the IOP due
to the
IBM/CDC MRJE stuff, and it's requirements for memory in the IOP are anywhere
from 16kw to 32kw depending on software options
selected at IOP generation
time. I would think that the prior versions of TSB would
certainly not need
more than Access so I'd have to suspect the memory indicated by the non-SSA
cards in the memory subsystem is adequate.
Bob Shannon informed me a while ago that there is a
company still
retailing
the core memory module cards, but I have no idea of the price.
If someone needs
them let me know. I have a pretty huge number of spare
HP2100/21MX cards, including the SSA boards that are used by the 2116C. In
addition the SSA boards are generally pretty easy to repair.
Ok, I'm going to go sit in the corner and hide now!
Jay