On Wed, Sep 2, 2015 at 8:00 AM, Mike Stein <mhs.st...@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.
