hidden commands on TI calcs

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2 total messages Started by Greg Goss Wed, 10 Oct 1990 16:53

#5329

Author: Greg Goss
Date: Wed, 10 Oct 1990 16:53

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On my TI SR-50, pressing the 4 gray keys, then releasing one of them made the
calculator "go away" for 35 seconds.  It came back with a predictable result,
but once I figured a regression on it I could press the buttons to come up with
the result faster than it could.

On a friend's TI-50, he found a 8-key sequence that did the same thing. My
sequence didn't work on his, and his didn't work on mine.  How on earth does
someone find which 8 keys to press at once?

.../greg

Re: hidden commands on TI calcs

#5330

Author: p... Peter Scott
Date: Sun, 14 Oct 1990 21:22

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In article <3488@mindlink.UUCP>, a80@mindlink.UUCP (Greg Goss) writes:
> On my TI SR-50, pressing the 4 gray keys, then releasing one of them made the
> calculator "go away" for 35 seconds.  It came back with a predictable result,
> but once I figured a regression on it I could press the buttons to come up with
> the result faster than it could.

I used to have an SR 51-A... now there you knew you had a calculator.
Lots of polystyrene foam packing, a weight to build those wrist muscles,
and a cost to strain the pocket book.  Anyway, I found there were
certain combinations of INV and 2ND and number keys which produced some
interesting results.  Some were functions of the number in the display;
I tried plotting them and wound up with wildly oscillating curves.
Others would cause it to start counting frantically.  Another one
was actually useful: it would display the 3 "guard digits" that you
couldn't ordinarily see; pressing any other key (I know, the SR 51-A
didn't have an "ANY" key either) would shift the display back.

-- 
This is news.  This is your       |    Peter Scott, NASA/JPL/Caltech
brain on news.  Any questions?    |    (p...@aristotle.jpl.nasa.gov)

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