Re: hp 20s self test Message #6 Posted by Gerson W. Barbosa on 23 Dec 2007, 4:28 p.m., in response to message #3 by Charles Oxford
I haven't been able to find any HP-20S manual other than this one in Portuguese, which may be useless to you. Anyway, I hope this excerpt from the original manual helps:
1. First, hold down the [C] key, then press and hold [y^x]. (A continu-
ous selft-test can be performed by holding down [C] as you press
[1/x]. This test displays various patterns and the copyright message,
then automatically repeats. The test continues until you halt it by
pressing [C].)
2. Press any key four times, and watch the display as various pat-
terns are displayed. After pressing the key four times, the
calculator displays the copyright message COPr.HP 1987 momen-
tarily, and then the message 01. This indicates the calculator is
ready for the key test.
Gerson.
Edited: 23 Dec 2007, 4:29 p.m.
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