I will like to see how you did it, i did not understand if your second
version worked on a VGA monitor or in a MDA, anyway i will like to take
a look and when i find litte time to play i would like to make it work
on a VGA, kind of making a litte Serial VGA display to inplement in
other
projects

Thanks

Pablo

ERIC SCHLAEPFER wrote:
>
>      Hello All,
>
>      A while back there was a thread about connecting a computer moniter to
>      a PIC controller. Well, I was intrigued, so I decided to see if this
>      could be done.
>
>      Many hours and one broken moniter later, I am proud to report that
>      yes, indeed you can connect a PIC16F84 at 4mHz to NEC MultiSync
>      moniter. The first version of my video controller worked with a MDA
>      monochrome moniter, but unfortunately I learned the hard way that
>      these moniters don't like too high a frequency.
>
>      The final version displays some numbers(albeit static) on the screen
>      in a surprisingly crisp and noise-free manner. The resolution is about
>      25x370.
>
>      I had to calculate the timings based on the fact that the '84 at 4mHz
>      runs at about one microsecond per instruction,(two for jumps) and that
>      the MDA scan rates are 18.432 kHz horizontal, 50Hz vertical. 4mHz is
>      just about the bare minimum to display legible numerals on the
>      display; at least with these refresh rates.
>
>      If anyone is interested in the circuit diagram and program source
>      code, feel free to email me and I will send them to you.
>
>      Eric Schlaepfer
>
>      P.S. Off Topic: does anyone know what could be wrong with my broken
>      moniter? I think it is a fuse because the power light doesn't come on
>      when I flip the switch. Also, when the thing broke there was no smoke
>      or that nasty electrical burning smell.

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_/                   N  A  F    Electronic                      _/
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