The Museum of HP Calculators

HP Forum Archive 21

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HP42S graphics
Message #1 Posted by Han on 19 July 2012, 7:58 p.m.

Does anyone know how graphics data are stored on the HP42S?

Han

      
Re: HP42S graphics
Message #2 Posted by Luiz C. Vieira (Brazil) on 19 July 2012, 9:33 p.m.,
in response to message #1 by Han

Hi.

You mean converting the LCD contents into something like a series of bits (bytes) like what happens when we use LCD-> in the HP28S? If so, I confess I have never heard of it. Fact is that the LCD contents are (surely) mapped somewhere in RAM, and if anyone here have found a way to copy this area somewhere else and give it a name, then it could also be retrieved in a corresponding maneuver. Problem is that the HP42S has some fixed data types, and the largest ones are matrices, and they must have a known structure that might corrupt the LCD data regularity (I am kinda reasoning on the clouds, now...)

Anyone?

Cheers.

Luiz (Brazil)

      
Re: HP42S graphics
Message #3 Posted by Raymond Del Tondo on 20 July 2012, 12:23 a.m.,
in response to message #1 by Han

Tracing AGRAPH with Emu42S should give someone hints;-)


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