HP-71B HP-IL Interface Module Versions


I have 2 82401A interface modules. One is software version 1A (8529) the other is software version 1B (8628).

Can anyone tell me what the changes are in the modules, or the software bugs that were fixed?



Are there no HP-71B experts here who can help with this??


Hi Gordon,

I have an addendum page (in french) for the HP-IL manual with bug workarounds for the 1A version.
Here is a sort summary (translated by myself, sorry ...):

1 - ENTER: if an under/overflow can occur during numeric input, then use an alpha variable and use
the VAL function, OR make sure that flag -1 is clear and don't place other variables after the numeric variable.

e.g. replace
A=VAL(A$) @ B=VAL(B$)

2 - OUTPUT and PRINTER IS: Avoid risk of Memory Lost during OUTPUT and PRINT by using one of these actions:

* use ENDLINE to define the end-of-line sequence with zero or three characters,

* or use OUTPUT and PRINT instructions that don't send end of line sequence (end the instructions with ';')
and define an infinite width for PRINT

3 - CAT and CAT$: avoid Memory Lost condition during CAT operations by using one of these actions:

* don't press any key when the mass storage is busy (LED on)

* or make sure that the first file is not deleted (immediatly PACK if you delete the first file)

4 - PACK and PACKDIR: avoid Memory Lost condition during packing of a medium by NOT using a user
defined function in the unit identifier.

Bugs 2 and 3 were the most serious ones.
I remember that in these old good days I always used a 3-character end-of-line sequence: ENDLINE CHR$(13)&CHR$(13)&CHR$(10) (bug 2).
It was also a good practice to create a dummy first file just after disc initialisation to protect against bug 3.




Thanks for the help!

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-41 module covers and side port cover Nate Martin 1 1,057 12-02-2013, 01:51 AM
Last Post: Giancarlo
  [HP-41][HP-71B][HP-75C/D][HP-IL] Found a mother-lode of programs on ftp.stak.tk rdj 2 1,165 11-26-2013, 05:31 PM
Last Post: rdj
  Help: HP-41CX and IR module Marcel Samek 13 2,914 11-14-2013, 11:00 AM
Last Post: Marcel Samek
  How to move lexfiles from PC to 71 w/o HP-IL? Joe Horn 9 2,502 10-18-2013, 03:50 PM
Last Post: Christoph Giesselink
  HP-71B Cursor Chirp aj04062 4 1,431 09-29-2013, 08:30 PM
Last Post: Geoff Quickfall
  HP48GX Interface to a PC John W Kercheval 7 1,890 09-29-2013, 10:53 AM
Last Post: John W Kercheval
  Best way to test HP-71B RAM modules (the 32K/96K ones etc.)? Philippe Lasnier 4 1,824 09-25-2013, 09:54 AM
Last Post: Philippe Lasnier
  HP Prime "Symb" interface (bug?) Han 8 1,823 09-13-2013, 12:48 PM
Last Post: Chris Tvergard
  Hand Held Products RS232 to HP-IL aj04062 11 2,445 08-31-2013, 07:12 PM
Last Post: Paul Berger (Canada)
  HP IL over wifi ... (ILPer & go71b) Olivier De Smet 12 3,147 08-20-2013, 05:44 AM
Last Post: Olivier De Smet

Forum Jump: