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HP-41 Halfnut constrast setting
11-02-2020, 05:49 PM
Post: #1
HP-41 Halfnut constrast setting
I know there are functions around to fiddle with this nibble, I am wrote some myself long time ago. What I wonder is, what is the preferred way of doing it today? Having functions or a mode/means to press plus or minus key to adjust it, what is around?
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11-02-2020, 06:02 PM
Post: #2
RE: HP-41 Halfnut constrast setting
In the HEPAX module is a funtion called CTRAST to setup the contrast.
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11-02-2020, 07:31 PM
Post: #3
RE: HP-41 Halfnut constrast setting
I've never had any reason to change it; but is there a way to do so with synthetic programming, or with something like the ZENROM's RAM editor?

http://WilsonMinesCo.com (Lots of HP-41 links at the bottom of the links page, http://wilsonminesco.com/links.html )
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11-03-2020, 08:39 AM
Post: #4
RE: HP-41 Halfnut constrast setting
(11-02-2020 07:31 PM)Garth Wilson Wrote:  is there a way to do so with synthetic programming, or with something like the ZENROM's RAM editor?

I don't think so, on my 41CX halfnut I found that the contrast was a bit low so I adjusted it with the functions from the Sandmath module which were initially published in HPX V1N6p8 by Michael Katz:
  • CTRST [Set Display Contrast]
  • CTRST? [Find Display Contrast]
  • CNT+ [Increase Contrast]
  • CNT- [Decrease Contrast]
Having a way to increase/decrease the contrast as on the Pioneers makes it easy to adjust to the correct value, but on my 41CX, once adjusted I didn't had to change it again. So I would say it's useful but rarely used.
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11-03-2020, 01:22 PM (This post was last modified: 11-03-2020 01:22 PM by Ángel Martin.)
Post: #5
RE: HP-41 Halfnut constrast setting
with value in X: (between 0 and 15)

Code:
094    "T"    
013    "S"    
012    "R"    
014    "T"    
003    "C"    Michael Katz
0F8    READ 3(X)    
38D    ?NC XQ    
008    ->02E3    [BCDBIN]
0A6    A<>C S&X    
130    LDI S&X    
010    CON: 16    
306    ?A<C S&X    
01F    JC   +03    
085    ?NC GO    
0A2    ->2821    
270    RAM SLCT    
3F0    PRPH SLCT    
0A6    A<>C S&X    
168    WRIT 5(M)    
149    ?NC GO    Select Chip0
026    ->0952    [ENCP00]
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04-13-2022, 07:27 AM
Post: #6
RE: HP-41 Halfnut constrast setting
If you're interested in seeing the different halfnut contrast settings before investing the time and effort to get a program working to set it, I captured all the settings below.




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