HP65 Error

[teenix]

Hi all,

If anyone has a working 65 and a few spare minutes, I am trying to verify an error condition.

Test #1
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1) Turn power on

2) Press [A] - (does 1/x) so this will divide by zero and the display will flash for the error.

3) With the display flashing, read a card. After reading, the error remains.

Trying to clear the error on the next key press, the display blanks for a second or two then the error remains whereby it will clear on the second key press.

Program memory will be cleared, but I suspect this occurs with any card read errors.

Test #2
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Turn the power off, then repeat steps 1, 2 and 3

With the display flashing, switch to program mode.
Try to clear the error with a key press.
The display will go off and the calculator will freeze.

Jus for info...
The PRGM/RUN switch can accidently be changed while the card is reading or writing.
Reading in this situation aborts the read but program memory is cleared.
Writing in this situation, the write seems to be aborted but the program memory is corrupted.

The 65 seems happy to read a 67 card but as expected the program memory is corrupted with "unknown" data.

I know this is an unusual way to operate the 65, but just testing.

Any help appreciated

cheers

Tony