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HP-41CX Halfnut Contrast



#4

I was reading one of the CHHU issues today and they describe a program to change the angle of the display on a Halfnut. Can anyone point me in the direction of this program?
Thanks


#5

Hi;

You'll need specific ROM to control halfnut's contrast. If I am not wrong, PPC ROM and PANAME are both that have this functions. In fact, you may also add all lower-case letters in a halfnut LCD.

There is more about this subject, this is what I can tell.

Best regards.

Luiz C. Vieira - Brazil


#6

I don't think there is any functions in the PPC ROM for
this. The contrast is controlled by a register that you
only can access through machine code. The PPC ROM only
holds user code, unless my memory is wrong. Also, I
believe the PPC ROM was made before the halfnut, so
that would mean it's very unlikely they have a function
to control the halfnut contrast.

The same is true for lowercase characters. You really need
to program in machine code to generate those characters.

This is one of the few moments when I think that I might
enjoy a halfnut CX instead of my fullnut.


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