HP-41 Halfnut constrast setting

[hth]

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?

[CY-CL]

In the HEPAX module is a funtion called CTRAST to setup the contrast.

[Garth Wilson]

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?

[Didier Lachieze]

(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.

[Ángel Martin]

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]

[dmh]

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.