HP41 TVM Program

[Dieter]

(05-31-2018 10:51 AM)KD8TZC Wrote:  [Edit] created an account on that one site and I see it. Next question is this... what do I do with the ROM and how do I get it on the calculator. I assume I need some sort of interface which I don't have.

Unless you own some special (non-HP) hardware the ROM is useless for a regular hardware HP-41C / CV / CX. The 41CL has been mentioned, but this is a different story, essentially a complete hardware upgrade of the innards of your calculator. However, you may use an emulator like V41. The latter comes with a variety of ROMs, including the Advantage ROM's and other TVM programs.

If you simply want to use your regular HP-41 take a look again at the listings of the Advantage ROM's TVM program. Please note that the program will not fit into a plain vanilla 41C, here at least one memory module is required. This limitation does not apply to the CV or CX.

You may also use the program that is included in the Standard Applications manual that came with your calculator. The listing (without any instructions) can be found here on this site. Set User mode, initialize with Shift [a], use [A] through [E] for n, i, PV, PMT and FV. Entering data with the digit keys stores the value, pressing the respective key without input calculates it. This program only supports "end" mode, while the Advantage ROM's lets you also select "begin" mode.

Dieter