Steve,

Reading the FAQ i must gently disagree.
My 8255 decision tree would nest more.


Volume Production ?
Yes = FULL STOP
No=Continue


More than 10 ?
Yes = FULL STOP
No = Continue


Is the I/O Direction "static" in function ?
Yes = Consider alternatives for Latches and Buffers.
No= Continue


CMOS VERSION ?

No = FULL STOP
Yes = Continue


Did you buy an extra ?

No = FULL STOP
Yes = Continue


Are you willing to tape this part into the chassis of the Device ?

No = FULL STOP
Yes = Continue


Are you aware this part can glitch low when the MODE WORD Updates ?

No = FULL STOP
Yes = Continue


Are you aware of "tRV" timing (period between falling edge of /wr or /rd and the leading edge of the next falling edge)?


No = FULL STOP
Yes = Continue



Will this device do something neat ?

No = FULL STOP
Yes = Continue




regards,
p