HP-41 MCODE printer entries? - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: HP-41 MCODE printer entries? (/thread-6823.html) |
HP-41 MCODE printer entries? - hth - 09-10-2016 05:01 AM Has anyone documented stable MCODE entry points that work with all HP-41 printers? I am aware of the original 82143A printer, the HPIL and the IR module. Are there any other printer ROMs in existence? HÃ¥kan RE: HP-41 MCODE printer entries? - J-F Garnier - 09-10-2016 09:56 AM I'm not sure that there is a printer entry point documentation, but I investigated several years ago, and here are my findings. There is a table at the end of each printer ROM, that act as defined entry points for several internal printer routines. There are also a few fixed entry points, because some ROMs (I identified the Time ROM doing it) directly call these entries, and it must work for all printer ROMs. My list: Code:
The HP82143, HPIL printer and IR printer are the only printer ROMs. The internal of the IR printer ROM is still unkown, several people (including myself) tried to investigate it, but without success. The IR ROM remains maybe the biggest mysterious part of the whole HP-41C system. J-F RE: HP-41 MCODE printer entries? - hth - 09-13-2016 05:45 PM Great! Thanks! I will get some disassembler output of the IR and 82143A printer so I can compare them a bit. |