Unknown ROM. Monitor 1A



#5

Hello. I have an unmarked HP41 ROM. There is a part number "etched" into the bottom that I don't recognize, "ET-14048". I'm not sure if this is a diagnostic type ROM. I received it with an unmarked Diagnostic ROM. The interesting thing is, a CAT2 shows "Monitor 1A". The label listing is a subset of the HP-IL Development ROM including SCOPE and MONITOR. The items that are mostly missing are the boolean, alpha and non-decimal math. There are 2 other functions included that aren't listed in the Devil ROM, IOFSX? and SETBUFX. If you are familiar with these functions let me know because I'm assuming the others that are common with the Devil ROM function the same.

Has anyone had experience with this ROM or heard of it. My guess is that it was a precursor to the Devil ROM used internally for some IL diagnostic. Or, I may be dreaming too much and it is simply an unlabeled standard ROM of some sort. Was there a "Control" ROM ever made?

Thanks for the help!


#6

There is a ROM made to use with the 3421A data acquisition/control unit. Its part number is 44468A. It doesn't have any of the functions you named. Its Cat2 description is -INST 1A-.

#7

It is an 'early' version of the DevIL ROM, one that wasn't generally sold to customers. And yes, most of the functions are the same in the DevIL ROM.
SETBUFX is the same as BSIZEX, and I think the other function you mention has an equivalent too. I believe that the diagnostic programs for HPIL devices were type-in programs for the HP41 using this module, and that if you
translate a couple of functions (SETBUFX -> BSIZEX is the main one) then they'll run on a normal 41 with a standard DevIL ROM.
I believe, also, that the MONITOR 1A rom was released to PPC and distributed by them as PPC EPROM 5A (that's just the name on the hip -- the title that shows up in CAT 2 was MONITOR 1A). Or at least that's what my synthetic quickref implies


#8

Thank you for the information. I'm aware of the Data Acq ROM and hoping to obtain one someday.

Are the HP-IL Diag programs you mentioned Tony in the HP41 Service Manual are somewhere else.

Thanks again for the insight.


Possibly Related Threads...
Thread Author Replies Views Last Post
  [OT] Unknown Olivetti calculator? Cristian Arezzini 4 839 05-24-2013, 01:17 PM
Last Post: Thomas Klemm
  NEC 1260(M) Monochrome Monitor aj04062 0 360 05-18-2013, 11:01 PM
Last Post: aj04062
  HP85 Programmable ROM cardtridge 82929A-service ROM not working- inaki 2 732 04-25-2013, 08:08 AM
Last Post: inaki
  shelf life time of a ROM, EEPROM, EPROM vs Mask Rom Guido (Canada) 6 1,063 01-11-2013, 04:09 PM
Last Post: Thomas Falk
  Big ROM - 41 System DEMO ROM Ángel Martin 5 972 10-16-2012, 05:28 AM
Last Post: Ángel Martin
  Unknown battery pack Nick R 4 739 05-27-2012, 01:32 AM
Last Post: Nick R
  HP-41 Wand: scanning from monitor? MichaelG 10 1,216 02-16-2012, 09:42 AM
Last Post: Vassilis Prevelakis
  HP-30b unknown options Christopher Johnson 3 562 02-01-2012, 08:37 PM
Last Post: Christopher Johnson
  [BUG] HP 50g SOLVE/SOLVR menu does not display unknown var François Vanzeveren 3 580 09-20-2011, 06:56 AM
Last Post: C.Ret
  HP-41 Unknown Interface Juergen Keller 7 895 08-28-2011, 02:24 AM
Last Post: Ángel Martin

Forum Jump: