HP 25

[ThomasF]

Hi Steve!

Sorry for being unclear - but I meant that you could check STO/RCL in RUN-mode.

In RUN-mode (normal calculation), can you store anything in the registers?
I.e. does "12345 STO 5 CLx RCL 5" result in "12345"?

Code:

Press        Display shows
12345        "12345"
STO 5        "12345.00"
CLx          "0.00"
RCL 5        "12345.00"

Or, if you press "g EEX" (clear reg) and then repeatedly on "Sum+" (the summation-key below "g")?
If RAM is correct, then the value in the display should increase with one for every time you press "Sum+" like this:

Code:

Press        Display shows
CLx          "0.00"
g EEX        "0.00"
Sum+         "1.00"
Sum+         "2.00"
Sum+         "3.00"

and so on ...

If this doesn't work, my 2 cents are that the RAM-chip is broken, and yes, a ACT replacement kit is probably needed (or a RAM-chip from another HP25 which might have another fault chip).

Cheers,
Thomas