|Interchanging ICīs in Spices|
Message #1 Posted by Vieira, Luiz C. (Brazil) on 17 June 2010, 1:09 a.m.
as we all share experiences, here comes one of mine.
A few hours ago I was struggling to make one working Spice of about four different nonworking units. I checked Ericīs marvelous reference page and found that some Spices - HP34C, HP38C and HP33E - share the same processor - 1820-2162 or 1820-2162A. I also remembered reading somewhere (old posts, very old posts...) that although Spices might have processors with same identification, they might not be interchangeable from one model to another (I concluded that the firmware might be different, though).
Anyway, desperate circumstances lead to desperate measures, so after trying different power boards and 'sandwiched' flex circuit, I took an HP38Cīs 1820-2162 and tested it with an HP34Cīs chipset. It worked well, and I (sadly) concluded that I have at least two Spicesī processors burnt out!
Well, I must confess that the HP34C worked well at least until I assembled the whole unit and realized that I kept an E-series power board inside of it, I mean, the poor thing shows
Pr Errorin the display every time it is turned on if left off for more then a couple of seconds. There we go again...
Although many people do not feel too well with Spices, I would like to point out some of their characteristics that call my attention:
- they are the last LED-based series calculators from HP;
- the HP38E/C is the first of all programmables with a [P/R] toggle key (all prior units have PRGM/RUN switch keys)
- the HP38E/C and the HP34C are the first pocket calculators with registers/program shared memory (I am not sure if the HP95C also have it, but anyway, it is not a pocket calculator, right?)
- they were the only HP pocket calculators with solderless assembly (yep, I know it is the cause of many bad contact and faulty operation, but there is nothing easier to maintain...)
- they were cheap instead powerful (someone once mentioned that the postfixed 'E' was from Economics...)
Please, if there is anything wrong in the above list I apologize. I wrote it by heart, and chances are that some data miss accuracy.
Yep, I like them. No favorites, I only prefer the HP34C and the HP38C because they have continuous memory and offer more resources than the others.
Edited: 17 June 2010, 1:18 a.m.