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?
exactly the same way as before because normally the eprom lives in code space and the pio in XDATA space. HINT: the EPROM should be accessed via PSEN the PIO via /RD and /WR.
BTW: all of your devices are obsolete.
Thomas
If want i can send the circuit but how attach the pdf file to this forum?
You can't attach files on this forum.
You will have to post it somewhere accessible, and give a link to it
if possiblecan u give ur mail id so that i can send the circuit and tell me how to solve?
if possiblecan micro give microresistor mail id so that i can send the circuit and tell me how to solve?
I decoded the abbreviations and it still makes no sense
Erik
8031, 27c256 and 8255.Here the
There are electronics stores around, why did you buy components in an antique store?
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