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

[Joe Horn]

(05-25-2015 01:42 PM)rprosperi Wrote:  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.

Alternative on the 41CX: Tapping ON while holding down the ENTER key performs a system interrupt without erasing memory. Sometimes that's useful for recovering from a bad crash.