Hard to offer any advice when you give no clue as to the type of system you
are talking about
Computer
Data Logger
Controller of some type
etc

--
Dan Hollands
1120 S Creek Dr
Webster NY 14580
585-872-2606

www.QuickScoreRace.com
"David Andrews" wrote in message
news:tpS7f.9607$%A1.9383@trndny01...
I have to expand i/o on a system that now has only 4 inputs and 4 outputs.
I need 12 inputs and 13 outputs.

Anybody got any ideas, i thought this would be easier.
Im familiar with the '249 output latches '151 and input multiplexors
but cant seem to get what i need... ?????