Need help with HP-71 HP-IL Interface Module

[rprosperi]

(01-14-2021 11:51 PM)wallyhp71b Wrote:  I have other Application & Ram Modules that are recognized when installed and pass the ROM TEST 1G 2G 3G 4G.

The built-in ROM test only checks the built-in ROMs.

But it's easy to check the other modules; for ROMs, simply check the contents via

CAT :PORT(1) for port-1, etc.

If RAM modules, it's easiest to check them by changing to IRAM, then copy a file there and verify it.

FREE PORT(1)
COPY FILENAME TO :PORT(1)
CAT :PORT(1)
CLAIM PORT(1)

If these work for all ports (1-4) the bus is probably OK, and I would then recommend cleaning the contacts in the HP-IL socket (on the 'up' side of the board) with Q-Tips and some DeOxit as Dave suggested. Put a healthy (but not dripping) amount on the contacts and let it sit there for 10 minutes to dissolve any oxidation, then clean it again with clean Q-Tips. This should clean the contacts if that is the problem.

Has the case ever been opened? If so, perhaps the contacts were damaged?

Also, to totally reset the electronics, remove the batteries and the short the first and last pins in the card reader bay together. In dry winter air, its possible there is a static problem upon inserting the module.