A new old bug in the printer ROM?

[rprosperi]

(10-20-2023 07:56 AM)Tinue Wrote:  

(01-18-2023 07:24 AM)ThomasF Wrote:  But, I still hope someone could shed some light but running the small test-program on a HP41 with the IR-module (82242) towards a real 82240 or with your emulator.

The user manual of the HP 82242A IR Module suggests that it uses the HP 82240A character set by default. The test program would not initially work with characters codes under 32. However, the module supports a command "MAPON", which turns on a mapping table and would then support codes 1-127.

Interestingly, the DM41X "Thermal Printer" module does not support the HP 82240A character set, and always performs a remapping. So I assume this module has been developed by Swiss Micros, and is neither derived from the 82242 nor the 82143 ROM.

I wonder if the DM41X IR hardware is compatible with the 82242 IR Module, and if thus the 82242 ROM would work. Unfortunately I don't have this ROM, and can't test this myself. Unfortunately the DM41X does not load the module: "Refusing to load unsupported HW module".

There is no VASM available for this module (it came out years after the enlightened VASM-releasing attitude was present) so the IO details and internal h/w is undocumented, so this ROM was basically 'blocked' to let users know it would not work.