HP 41c STAT 1 module version 1A

[Diego Diaz]

Hi all,

Since you've said that the Service module shows the "BAD ROM" message and some functions don't work as expected. My advice would be to first check if the ROM revision of the module is "1A" or "1B" as it may be that the ROM has been damaged and shows "1A". (Although it is not frequent.)

The Service module does in fact calculate the checksum and compares it with the value at address xFFF.

Run HEXEDIT with just NoV-64d (HEPAX) into port 1 and your "STAT-1A" into port 3.

Enter ADR:CFFB, you'll see either "001" ("A") or "002" ("B")

SST should show "031" ("1")

Also if you SST until address CFFF you'll see the checksum ("2F1") in the case of the "1B" version.

It has also been confirmed that the function "*c" is called from "*a". Since this is a FOCAL module you can GOTO ALPHA *c and list this program to see if it has been included in the "*a" version of the "1B" counterpart.

Keep us posted!

Cheers.

Diego.