Hi,
In one of my project i connected 8031, 27c256 and 8255.Here the A15 line is given common to Chip enable of EPROM and also connected to G1-pin of address decoder via a NAND gate.
So if the A15 is low eprom is selcted and if high 82c55 is selected.
But now i want to use 64kb eprom. I cannot connect the A15 like above.
Can anybody suggest how to do the accessing?
"previously i used the A15 to select the EPROM and the 8255 using my program. Now the A15 is used and i cannot access 8255"
Did you read the Hint from Thomas Zepf?
Do you have anything else mapped into XDATA space?