HP 21MX Ethernet/SCSI card?

jwsmobile jws at jwsss.com
Wed Feb 18 11:16:21 CST 2015

On 2/18/2015 7:43 AM, Jay West wrote:
> Johannes wrote...
> ----
> I just got HP 2109 E-series which I bought from eBay last week.
> ----
> Congrats! I love those machines :)
> ----
> I was planning to make own tape emulator interface for it, but I found
> mystery card from it, and it could solve some of data transfering
> problems...
> Here's pictures of
> it:https://drive.google.com/file/d/0B_DR111cK6W-M0FPSnR4VmRDR3M/view?usp=sha
> ring
> ----
the Symbios 53C710 near the connector has info that indicates that it 
may be an Symbios chip developed for HP for the HP 9000.  So it could be 
either a custom instrument card, or it may if you are luck be general 
enough to get to any SCSI.

Give these systems use with HP test equipment, I know that such as the 
16500B and 16500C have SCSI ports which allow the 16505 access the 
analyzer chassis.  This may be a card developed for the 2109 system by 
HP for a custom or limited run job.


> In all my years I have never seen such a card for HP21XX machines.
> Absolutely no clue.
> ----
> It seems to be from 1995  what I can guess from chip date codes, but theres
> no any manufacturers logos. As you can see pic, there is RJ45 and SCSI
> connectors. Is this somekind of emulator board for disk drive..? Can it used
> with PC (like old NetBEUI protocol) or is this for some
> very-special-made-for-very-special-communication-software?
> Computer itself is from Navy's Radcom station (made by Grumman Aerospace
> Division), maybe somebody knows more of this system...
> ----
> I'd have to see the card in person to guess, but I wouldn't think the RJ45
> would be Ethernet. Serial management port maybe? Just a WAG...
> If you're thinking of home-brewing something, I'd suggest starting with a
> Microcircuit Interface board. Those boards were designed to be general
> purpose interfaces and are a great starting point. Bob Shannon has a paper
> tape reader/punch emulator device that works fantastic that uses one, and I
> think there is an IDE drive interface floating around that may use a MCI
> board as well...
> J

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