In other threads today I reported failure of the self tests normal to the 15C and described on page 261 of the 15C LE manual.
But now, I can report that attempting to perform the "ON plus *" self test not only results in immediate "Error 9", but also corrupts any program that is in memory.
I had a Savage benchmark in memory consisting of the following steps:
001-42,21,12
002-44 0
003-43 8
004-42,7,9
005-0
006-42,21,0
007-1
008-40
009-11
010-43 11
011-43 12
012-12
013-43 25
014-25
015-42,5,0
016-22 0
017-43 7
018-43 32
(FWIW, putting a number in the X register, followed by "f" and "B" executes the Savage Benchmark for the number of iterations in X. If X holds the traditional 2500, the results will show in about 48 seconds.)
After turning the 15C LE off, then executing "ON plus *", I get "Error 9".
Then, when I go to program mode, here's what's I find there now:
001-42,21,11
002-44 1
003-43 8
004-42,7,9
005-0
006-42,21,0
007-44,20,12
008-11
009-43 11
010-43 12
011-12
012-43 25
013-26
014-42,5,24
015-22 0
016-43 7
017-43 32
Really really strange!
I did a reset with "ON plus -", got the expected and proper "Pr Error", then reprogrammed the 15C LE. I was able to get this conditionn to repeat.
I conclude that one won't want to try any self tests if there is something in program memory!
What else lurks out there? I've only spent a couple of hours with my new 15C LE.
I'm not all that happy with this, but it seems to have some, er, possibilities. :-)
Edited: 9 Sept 2011, 9:50 p.m. after one or more responses were posted