[Max Lobovsky]

There are some combined quadrature encoder interpreter/counter's with a 24 bit counter. If i was going to use 4, i'd have to use the same 8 digital i/o pins for all of them and then i think use an additional 4 pins to run them independtly. There are some that come with a rs232 adapter, but im not sure if i can get 4 to run through one, easily.

I do in fact need the resolution that i was saying. It is maximum rate of input that actually matters, not just having a high rate throughout the whole range of motor speeds.