Erroneous HP-16C
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01-12-2016, 09:48 PM
(This post was last modified: 01-12-2016 09:50 PM by damaltor.)
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Erroneous HP-16C
Hi everybody,
I have in front of me an HP-16c, which behaves oddly. The good: First of all, both self tests run without errors. But while using the device, the following happens: - I calculated 15 minutes of random integers. No problems. HEX/DEC/BIN/OCT work like a charm. - I noticed that converting to DEC takes a while (>3 seconds), while BIN/DEC/OCT are shown almost instantly. Is that normal? - Floating point calculation works. I calculated 10 minutes of random numbers and tried most functions. The bad: - I cannot change the word size in integer mode. If I type "8 WSIZE" the calculator display blanks and stays blank. If I pull out a battery, and wait a while, and put it back in, random things happen - blinking display, or wrong calculations (3+3=2.5) or such. I can bring it back to function with a memory clear (ON+MINUS). - If I go into PRGM mode and clear the programs, the calculator correctly shows "000-". If I start to type in programs, it always starts at line 85, and if I continue to program, the line number wraps around after line 91: Code: Key Display The interesting thing is, the program works anyway: if I now press R/S, the display shows "12345 d" which is correct as the word size is 16. Also, some key codes are shown wrong: Code: Key Display Most keys including the gold f-shift are wrong as far as I can tell (though the program seems to work fine as far as I tested, but I guess that would not work for longer programs). Any ideas? My guess: The RAM is broken or desoldered, as the self test runs fine I guess that the ROM should be ok (though I dont know what exactly is tested in the self test). |
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Messages In This Thread |
Erroneous HP-16C - damaltor - 01-12-2016 09:48 PM
RE: Erroneous HP-16C - Katie Wasserman - 01-13-2016, 04:25 AM
RE: Erroneous HP-16C - damaltor - 01-13-2016, 06:45 AM
RE: Erroneous HP-16C - damaltor - 01-13-2016, 07:54 AM
RE: Erroneous HP-16C - Dave Frederickson - 01-13-2016, 03:24 PM
RE: Erroneous HP-16C - damaltor - 01-13-2016, 04:01 PM
RE: Erroneous HP-16C - Katie Wasserman - 01-13-2016, 05:34 PM
RE: Erroneous HP-16C - damaltor - 01-13-2016, 08:47 PM
RE: Erroneous HP-16C - jebem - 01-14-2016, 12:10 PM
RE: Erroneous HP-16C - damaltor - 01-14-2016, 12:44 PM
RE: Erroneous HP-16C - Paul Berger (Canada) - 01-14-2016, 02:41 PM
RE: Erroneous HP-16C - rprosperi - 01-14-2016, 04:07 PM
RE: Erroneous HP-16C - damaltor - 01-14-2016, 03:11 PM
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