HP 2116 on ebay

[Bob Shannon]

Jay,

Remember you have some of my 2116 core boards I loaned out to you!

----- Original Message ----- 
From: "Jay West" <jwest at classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts" 
<cctalk at classiccmp.org>
Sent: Sunday, April 01, 2007 12:19 PM
Subject: Re: HP 2116 on ebay


>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
>
>