HP41.org

Hi Folks,

I have a short question: My HP41C has an installed Memory Module (HP82106A). Despite of that it shows "00 REG 46" by pressing the "PRGM"-Button. No programmed stuff.

So, without the memory module the same effect (00 REG 46). Do I have to do some special installation things for "waking up" the memory module or is it just not working?

Chris.

Hi Chris,

What you see when you go to PRGM mode is the number of registers available for program memory. By default it is 46 which means that on a bare HP-41C which has 63 registers of memory, 17 are assigned to data storage.
When you add a 82106A module, you’re adding 64 new registers that by default are assigned to data storage.
You should have now 64+17=81 storage registers, which you check by entering a number to X, then STO 80, CLx, RCL 80.
You can change the split between storage and program with the SIZE command: for example with SIZE 20 you’re changing the memory assignment to have 20 storage registers, if you go to PRGM mode you should now have more program memory.

Didier