Hp 21mx loader rom set

CuriousMarc curiousmarc3 at gmail.com
Mon Jun 29 00:20:33 CDT 2020

Hi Grant,
I looked at my collection and I have the 67-69 ROMs, which I also identified
as the DS/1000 ROMs (Distributed Systems Network). I also have a
91740-80033/34/35 set which I don't know what it is. Does anyone know? 
Anyhow, looking at the ROMs and dates, I suspect these are E/F microcode
only and would not work on the 21MX. So I think you'll have to go with one
of my cables, a standard mag tape card set and disconnecting your HPIB card
from the 7970 - so you were right from the start.
I would still be intrigued to see if anyone has the 70-72 set, and did not
know they were a DS/1000 extension, thanks Jay.

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of jwest---
> via cctalk
> Sent: Sunday, June 28, 2020 6:21 AM
> To: grant at klyball.com; 'General Discussion: On-Topic Posts'
> Subject: RE: Hp 21mx loader rom set
> Grant wrote....
> ------------------------
> Hi all, i am looking for a loader rom set for my 21mx and does not seem to
> be around at the usual places, I am hoping to find a leed.
> Here is what i am in need of.
> 12992L consisting of
> 12992-80011
> 91740-80070
> 91740-80071
> 91740-80072
> there is a set of 91740 on bit savers but with a suffix of 67-69 ?
> ------------------------
> Pretty sure I have a binary copy of all known 12992's, the ones I use I
> burn out to a set of blanks. The 7974 loader rom uses the boot loader
> extension firmware for DS/1000. Are you actually running ds/1000?? I
> seen anyone get that up and running.
> I'll see if I can dig up the bin (or an already burned chipset).
> J

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