HP 71B Diagnostic ROM

[Reinhard Hawel]

Hi Dave,

you really don't need the Diagnostic ROM except you want to repair a 71B. Usually you'll only need to Press

[ATTN] (=ON) and [ / ] simultaneously.

When you see the String "Init: 1" push the "2" key and then press [End Line]

The Rom Test should Show a "G" (for Good) after the Digits 1 2 3 4 (for the four ROMs) if you see a "B" you have a defunct ROM (which is really bad, I think).

This should be sufficient, because I think, when your 71B works satisfactorily, you won't need any more test functions.

BTW: Here's a Link to the Selftest Functions of some (all?) HP Calculators:

http://www.rskey.org/~mwsebastian/selfte....htm#hp71b

Postscript: If anyone has a Diagnostic ROM left, I'd also be interested :-)