Bicolor 8x8 Led DotMatrix Display - How ?

I want to drive 12 unit 8x8 Bicolor LED DotMatrix.
What is the algorithm for this ?
I just want color change. Red to Green or
Green to Red. Not same time displaying. Maybe with blue.

i have a related proyect 'bout dot matrix
'but its's for 8051 with driwing technics..

I need a little help to build my basic system for 8051 (i don't like the xternal RAMs and ROMs)
if you're interested, reply me quicknow.

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