by dlachieze » Wed Dec 15, 2010 4:42 pm
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