|(edited) Also, the halfnut units... (was: LCD displays life expectancy)|
Message #10 Posted by Vieira, Luiz C. (Brazil) on 6 Oct 2009, 4:52 p.m.,
in response to message #8 by Egan Ford
the contrast settings remains after being set, i.e., depends on calculator main hardware. It uses a four-bit range parameter (0 to 15), usually in the X-register. If you have HEPAX, try HEPAX function 005. Default contrast is 5 (0101) instead of expected 7 (0111)... Go figure!
And, yeap: contrast setting remains after MEMORY LOST, but I do not know how long does it take to restore to default after being without batteries... i.e., IF it restores.
(After posting, I edited to add that HEPAX 005 actually uses X-register contents, and I left my HP41 without batteries after a MEMORY LOST for some more than 1 hour and the contrast restored to default, then.)
Edited: 6 Oct 2009, 8:59 p.m.