Wanted: ROM images from HP 9895, 82901/82902, and other HP-IB disk drives

Jay West jwest at classiccmp.org
Wed Sep 2 15:13:34 CDT 2015

For drives of that general ilk.... I have:

Let me know if these would be of use.


-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Eric Smith
Sent: Wednesday, September 02, 2015 2:51 PM
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: Wanted: ROM images from HP 9895, 82901/82902, and other HP-IB disk drives

On Wed, Sep 2, 2015 at 8:00 AM, Mike Stein <mhs.stein at gmail.com> wrote:
> The ROMs in my 9114s are 09114-15514 REV R.
> Need an image? What type/size are they?

There 27128 (16KB).

There are at least five known ROM images for the 9114A/B, and I have images of two of them.  I'm not sure whether 09114-15514 Rev R matches one that I already have.  If you don't mind dumping it, that will be appreciated.  After I've collected a few of these, I'll put them up on a web page and post the URL to the list, in case anyone else needs them.

John R. Baker established a precedent for using the contents of the first two bytes to identify the 9114 firmware revision; I don't know with certainty that that actually uniquely identifies all revisions.

John wrote an HP-71B program to read the first two bytes over HP-IL.
It should be possible to read the entire contents over HP-IL, but I've found it easy to pull the EPROM and read it with an EPROM programmer.

John identified five firmware versions:

09114-15514A  first two bytes 80 a7  - from 9114A
09114-15514B  first two bytes ad fc   - probably from 9114A
09114-15515    first two bytes d8 b1   - not sure which model
09114-15516    first two bytes da dc   - not sure which model
09114-15521    first two bytes 10 8d   - from 9114B

I have images whose first two bytes match the -15514A and -15521, courtesy of another list member, though I don't know the exact HP P/Ns that were on the labels. The -15514 image I have has the first two bytes 80 a7, matching the -15514A in John's list, and has a checksum (sum of all the bytes, modulo 64K) of 81ce.  The -15521 image I have matches the one in John's list, and has a checksum of 112a.

Some years ago I did a fair bit of study of a disassembly of a 9114A ROM image, but unfortunately seem to have misplaced the results. I'm not sure whether I'll do it again.  IIRC it had a few more DDT and DDL commands than were defined in the Filbert (82161A tape drive) command set, and it also had an entirely different command set which I later found out was SS/80, for use by the HP 110 Portable and Portable Plus.

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