You cannot do it with a microcontroller, you need three fast ADCs (6 bits
each), and a small collection of gates and counters or a FPGA to hadle the
clock and enable. If this is a one off you could try to make it work in
B/W (eight colors) by wiring the 6 inputs of each color in parallel and
driving them off a slicer (comparator) from each, r, g, b output of the
VGA. You still need to handle the gates for the clock & co. Imho read the
spec carefully because you may have to invert the polarity of the RGB
signals every other line. Most (?) displays work with such signals.

good luck,

Peter

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