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.