Re: 41CX LCD viewing angle Message #4 Posted by Ángel Martin on 21 Oct 2003, 2:53 a.m., in response to message #1 by David Brunell
Halfnut models are capable of changing the contrast settings, but unfortunately HP never got to update the function set to include control on this, so you'll need a (EP)ROM with the function actually implemented.
Or if you can key in MCODE, this is the rutine that will do the work. Input the contrast value (from 0 to 15) in the X register, then execute the function.-
094 "T"
013 "S"
012 "R"
014 "T"
003 "C"
0F8 READ 3(X)
38D ?NC XQ
008 ->02E3
0A6 A<>C S&X
130 LDI S&X
010 CON: 16
306 ?A<C S&X
01F JC B8BC +03
085 ?NC GO
0A2 ->2821
270 RAM SLCT
3F0 PRPH SLCT
0A6 A<>C S&X
168 WRIT 5(M)
3E0 RTN
Best, ÁM.
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