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HP Forum Archive 13

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Spices: Internal check for ID # and the "2" disease
Message #1 Posted by Vieira, Luiz C. (Brazil) on 29 June 2003, 6:33 p.m.

Hello guys, Norm mostly;

I summarized below all information I could gather about Spices (some with me, some with other people). If I have the chance to collect more data OR if anyone else can add new info, let's feed this thread and later we can put all of the information together and, maybe, identify common points related to the "2" disease.

Columns are:

ID# - calculator identification number/code.
"2" - "2"-disease occurrence: Y means it has the "2" disease, N means it doesn't.
CT - Construction type - a single S means soldered; SL means solderless.
CPU ID # - CPU Identification number/code - I added the "date code", which is a lot better than calculator's serial #.
1, 2, 3 - position reference for extra 8-pin DIP IC's, being 1 the IC closest to the LED display; ---- indicates no IC present.

ID# "2" CT CPU ID # 1 2 3 OBS 31E N SL 1820-2105-B (7922YY) ---- ---- 1MA301 31E Y S 31E 2438 00031 ---- 1MA15002 (1) 33E Y SL 1820-2105 (7822EX) ---- 1MA10204 1MA10003 34C N S 34C/B-2102 00034-69110 1LB902 1MA10014 1MA115 (1) 37E Y SL 1820-2122 (7819MO) 00031 no_label 1MA10008 (2) 38C N S 38C/B-2102 00038-69110 1LB903 1MA30006 ---- (1) 38C N SL 1820-2162 (7944DY) 1LB903 1MA305 ---- 38E Y SL 1820-2122-A (7850MC) 1MA107 1MA10013 1MA10005 38E Y SL 1820-2122-A (7916CS) 1MA105 1MA113 1MA30003

(1) - CPU ID in paper label; I tried to remove to see the actual chip code, but it would destroy the label.
(2) - the "no_label" means there is a chip and no identification on it.

If the table does not look O.K. for you (screen resolution or other reason) you may edit this post and copy/paste its contents so you can visualize it in any text editor.

If the code found beside CPU's ID number (right side, in parenthesis) is a date code and first two digits refer to the year, then it's easy to observe in this sample that calculators before 7916 (four units) show the "2"disease symptom, and the ones after 7922 (two units) do not. But this is not enough sample to conclude anything about it. One single unit after 7922 with the "2"disease and we start over.

Hope this helps a bit. And please, if someone else feels confident opening their Spices and checking, you can edit this one just to sample the table below and fill with new values, if you think it's well built. If you want to add your information your own way, please, feel free organizing it the best way you find. It will be useful as well.

Best regards

Luiz C. Vieira - Brazil

Edited: 29 June 2003, 9:35 p.m.

Re: Spices: Internal check for ID # and the "2" disease
Message #2 Posted by Ellis Easley on 30 June 2003, 9:21 a.m.,
in response to message #1 by Vieira, Luiz C. (Brazil)

Here's the numbers from my 34C's. I added the serial number prefix for the units. There are datecodes on the 8 pin IC's, too, but they are in a different format with 5 digits. I have one question: do all units with the "2" behavior also flash the minus sign and random commas while executing built-in functions? (enter -99.9 and press "X!" to keep the machine working for almost 30 seconds)

ID# "2" CT      CPU ID #              1       2       3       OBS    UNIT S/N PREFIX

34C Y SL 1820-2162 A (7906) 1LB5 002 1MA1 14 1MA1 0015 1934A 34C N S 1820-2162 (8047) 1LB9 02 1MA1 14 1MA1 15 2051S

(2) - the "no_label" means there is a chip and no identification on it.

The chips with a very shiny black plastic package marked with mettalic-looking ink are sometimes very hard to read. I think this is why they started burning the markings in with a laser! Sometimes if you shine a flashlight from different angles, and change the angle you eye is looking at the chip, you can read the markings.

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