Hello again,

Ive been fiddeling with the question
how to build this mini mainboard/dev.board

It has 32kb of sram, and some eprom memory. (I asume also 32kb)

Now my address bus is 16 bit wide
(Latched)

Everything went smoothly, TILL i wanted to add an IO section to my dev.board.

I want to map the IO with the same address bus as the memory. 'no problemo'!

But now i want to read/write to the IO, and i want to use the same read/write outputs as used for the memory.

Do i have to add an AND port to every RAM/EPROM for its -CS ? So i have to select MEMORY or IO in my program?

the asserting the -OE pin on the sram doesnt save the sram from being overwritten during IOWrite (thus Write strobe) instruction right?