|Re: What to do with new HP-25|
Message #11 Posted by Vieira, Luiz C. (Brazil) on 29 July 2003, 2:48 a.m.,
in response to message #10 by Victor Koechli
I do not think RAM chips would "fry out" just because you are using the equipment, and if so, then you have an equipment with a lazy electronic design.
What I do not know is: would any X-MOS (X == C, P, V, N, whatever...) component be timeless? Of course they are not, and under different circumstances, either bipolar components can be destroyed or altered in such a way they will not work properly.
What in fact bothers me is that there are no replacements and, at least so far, no hardware emulators for these calculators. Once fried, the owner should pray for a donated organ. I found one 32KRAM chip in a sound board that was used in an HP42S and it worked perfectly fine (at least I was not yet called back...). Waht to do if a RAM, or an ACT chip dies? And there is no way to be sure that it's not gonna happen when you switch your calculator ON next time... Current surges are also dangerous in some circumstances, as well as ESD.
I prefer the LCD ones. Although they deal with µA and excessive current would fry them easiear, protection is enhanced in their case. At least I hope so... If not, some of them are still available and are easier to be replaced.
Edited: 29 July 2003, 2:51 a.m.