[DM15 V24] D + ON

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[DM16 V22] CHS gives unexpected results
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Krauts In Space
Posts: 85
Joined: Wed Jan 03, 2018 2:48 pm
Location: Nuremberg, Germany

[DM15 V24] D + ON

Post by Krauts In Space » Sat Jan 13, 2018 5:32 pm

I found no documentation what D + ON does - so I tried.
X:0 -> 0.000004
X:2 -> 0.000008
X:4 -> 0.000010
X:5 -> 0.000014
X:6 -> 0.000018
x:10 -> 0.000404
x:16 -> 0.0004058
X:65536 (2^16) -> 0.001019 -00
X: 2^32 -> -5.802411 -0 (yes, just one digit in the exponent, with one space left behind)
X: 2^19 -> 0.001414 -00 (yes, two zeros)

funny:
X: 2^20 -> 0.001804 O2 (exponent first digit is an 'O' as in ERROR).

X: 2^17 -> 0.000240524. After 2 times X<>Y i get a flashing 9.999999 99
DM15L S/# 10584 FW v25
DM42 S/# 01015 FW v3.5

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Mark Hardman
Posts: 69
Joined: Wed May 03, 2017 1:26 am
Location: Houston, TX

Re: [DM15 V24] D + ON

Post by Mark Hardman » Sat Jan 13, 2018 7:34 pm

You've discovered a know bug in the original HP-15C ROM that allows non-normalized numbers (NNNs) to be created by pressing ON-y^x simultaneously. Here's an article with more information on Eric's site:

HP-15C Synthetics
DM42 S/N: 00043 (Beta)
DM42 S/N: 00065 (Beta)
DM42 S/N: 00357

Krauts In Space
Posts: 85
Joined: Wed Jan 03, 2018 2:48 pm
Location: Nuremberg, Germany

Re: [DM15 V24] D + ON

Post by Krauts In Space » Sat Jan 13, 2018 9:59 pm

Mark Hardman wrote:
Sat Jan 13, 2018 7:34 pm
You've discovered a know bug in the original HP-15C ROM that allows non-normalized numbers (NNNs) to be created by pressing ON-y^x simultaneously. Here's an article with more information on Eric's site:

HP-15C Synthetics
Ok! Thanks!
Wide field to play with, I suppose ;)
Benefit of having a DM15 is, I can save my calculators brain before that :)
DM15L S/# 10584 FW v25
DM42 S/# 01015 FW v3.5

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