WP31s error recovery

[BarryMead]

(03-05-2015 08:13 PM)rprosperi Wrote:  

(03-05-2015 08:04 PM)Dieter Wrote:  Hmm... I was quite surprised to find that already Bit's earlier version 3748 (more exactly: the one you recently posted as wp31s.zip) has a kind of UNDO of UNDO:

Code:

1 [ENTER] 2 [ENTER] 3 [ENTER] 4

T  1       1       1       0
Z  2       1       2       1 
Y  3       2       3       2
X  4      12       4       3
     [x]    [UNDO]  [UNDO]

What's different in the newer version?

Dieter

Undo of Undo should put you back to 1,1,2,12 since it is undo-ing the last operation, back to it's prior state.

Bob: I just flashed one of my wp34s calculators with the NEW wp31s.bin image and the UNDO of UNDO works as expected.
I do get 1,1,2,12 back in the registers after the 2nd UNDO using your example. I suspect that you flashed your calc with the
OLDER wp31s.bin image. This seems to be true, because when I just checked the "Download Count" only 1 person had downloaded
this latest file, and that was me to verify that it contained the latest version. Download, unzip, and flash your calc again with the latest
version and the UNDO of UNDO will work.