unprogrammable HP 25

[Steve Simpkin]

(07-22-2021 11:08 AM)dmh Wrote:  I have a 25 that appears to work normally in RUN mode but in PRGM mode when I enter a program I see the correct keycodes as I enter them but the program ends up all GTO 00 commands.

Does this mean the RAM chip is dead? Isn't it used for RUN mode arithmetic at all?

Thanks, dmh

The HP-25 RAM chip is only used for the 49-step program storage, 8 memory locations and the Last X function memory. The stack and internal working registers are all contained within the ACT chip.