HP-41CX mistake(?) installing HP-IL module

[rprosperi]

(05-25-2015 08:45 AM)MattiMark Wrote:  Hi Hans,

Thanks for the fast reply. I don´t have the calculator at hand right now so I will try it when I get home.

The calculator has 'frozen' - it doesn´t respond to any input nor removal of the batteries. How might that be resolved?

Regards,
Matti

Try resetting, by holding down [ON] and pressing the Back-arrow twice quickly. This procedure is not in the manual, but after learning it long ago (at a PPC meeting probably), I've found it will often restore operation w/o a MEMORY LOST.