SCENIX VIDEO VIRTUAL PERIPHERAL Design Challenge and Contest
Russell McMahon email (remove spam text)
You need to specify what additional hardware is acceptable.
While you can certainly do it with the processor alone, addition of a single
dot clocked shift register greatly reduces overhead.
Sure, it's then not pure software but if the aim is to be purist rather than
allow a $0.20 part you may have to also exclude any external resonator and
run with the Scenix internal oscillator (at 4 MHz). After all, the resonator
costs rather more than the glue logic needed for a dot clock and shift
register. Then we'll see how it compares to a PIC :-).
>Ok, its time for us Scenix users to put this PIC video thing to rest... We
>alone have the speed required in a low cost micro controller to really make
While we are on the "we alone have ..." thought, look at the Clive "I can do
magic" Sinclair ZX80 which used an ancient and venerable (and venerated?)
Z80 plus a shift register to work video magic. It also managed to pretend to
be a "full" computer during the flyback period. The CISC set-and-forget
block move instruction has it's place :-).
I'm sure the Scenix would be hard to beat in this application using a true
single chip solution but it does wilt rather on other tasks in the face of
some of the competition.
http://www.piclist.com hint: The PICList is archived three different
ways. See http://www.piclist.com/#archives for details.
See also: www.piclist.com/techref/ubicom/lib/io/index.htm?key=video
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