WP 34s programming bug

[arhtur]

I found a bug that causes the WP 34s to reach an unstable state (or at least not an expected or predictable state). This was tested on the WP 34s with version 3.3 R3915, another WP 34s with crystal installed - version 3.3T R3686, and the iOS WP 34s (latest version).

The below steps were done on a WP 34s with version 3.3 R3915.

Use fresh batteries and remove from calculator. Press ON button to drain any residual power. Reinstall batteries. Screen should say "Restored"
Press P/R
001 LBL 01
002 1
003 STO+ 11
004 GTO 01
Press P/R (exit program mode)
Press R/S (start running)
Wait for 10 seconds
Press R/S again
Press <- (back arrow)
RCL 11
Press P/R
Press down arrow to go to last step (004)
Press <- (back arrow (or delete program step)) 4 times.
Press P/R (exit program mode)
Press R/S (IMPORTANT STEP)
Press P/R again (enter program mode)
Press <- (delete program step)
Press <- again

Steps remaining is now 928
Display will slightly dim