User controllable Register that feeds values into two pre programmed eproms which ...

Hi I am not sure how to achieve this but basically I'm hoping that someone can help me out with a simple schematic on how to have a bunch of switches which control binary values in a register that when triggered by a final button fire an address to two parallel eproms which would then output data which would indicate which of a series of logic circuits to turn on. I could then press another button and erase the values in the register and start again.

I hope this makes sense, it's about the best way I can think of describing it.

Now for the inevitable "why aren't you using SPI?"
Why have I said Parallel eproms and not SPI - because I have about 100 of the things just sitting there.

I have a basic knowledge of electronics and this is just a bit beyond me.

Cheers in advance.