[Simh] What OS was this {HP2100}

[J. David Bryan]

On Friday, November 4, 2011 at 21:49, Ron Hudson wrote:

> I also remember if one entered the command "why" on the terminal the OS
> would reply with "Why not?" 
> 
> What OS was I probably running?

You were definitely running DOS-III (the only HP OS that had a WHY 
command).  Have a look through:

  http://www.bitsavers.org/pdf/hp/1000/DOS-III/24307-90006_Feb-1975.pdf

...particularly Section II, "DOS-III Directives," and see if it looks 
familiar.  (The WHY directive was undocumented. :-)


> Can I run that same OS under SIMH?

Yes:

  HP 2100 simulator V3.8-1

  HALT instruction 102077, P: 02020 (CLC 0,C)

  sim> go
  INPUT :DATE,XXXXXXXXXX,H,M

  @:DATE,05-NOV-11,13,46
  SUBCHAN=01
  LBL=SYSTEM
  DISC GEN CODE 1503 NOT SYS GEN CODE 2575 ERR POSS
  @
  :JOB,DAVE
  JOB DAVE  05-NOV-11  TIME=0826 MIN. 15.2 SECS.
  @
  :WHY
  WHY NOT?
  @
  :EJOB
  END JOB DAVE  RUN=0000 MIN. 44.0 SEC.  EXEC=0000 MIN. 00.0 SEC.
  @


> If so where can I get it?  

I'll work on getting a DOS-III disc image to Bitsavers for posting.

                                      -- Dave