Rumor has it that ajp166 may have mentioned these words: And that's what I want them for. With Tony's advice, I figured out a way to design my board with (2) separate CE/ signals (Is that how you denote Chip Enable, Active Low in ASCII?) but I needed a variable way to address from 1 to 4 memory locations to each CE/ externally -- that's why I don't want to monkey with a chip-based solution -- switches are just easier that way when tinkering. My idea: A 2-4 decoder/demux. tied to A0 & A1, with the outputs going to one side of a SPDT DIP switch, the other side of the switch pulled to +5, then all four of the switch outputs going into a 4-input AND gate. That way, you could switch any of the four addresses on or off, so that you'd have access to more than one memory location for CE/ to implement UARTS & stuff that require more than one address to function. (It can be done easily without the switches -- I could use a jumper block without heartburn, but the switches would look neater, and wouldn't have the chance for floating inputs/outputs...) Dunno if it make sense to y'all, but it looks good (so far) in my head, anyway... ;-) Anyway, that's my plans -- now back to AutoCad to start mapping the stuff in. Hopefully I'll have an updated board uploaded to the website by next weekend... :-) Laterz, "Merch" P.S. Thanks everyone for the helpful tips on where I might locate these -- I'll start hitting the web & phone next Monday to attempt to fine a supplier. (I have a clutch to fix on an '84 Pontiac Fiero that I fear will take a large portion of my weekend... :-( -- Roger "Merch" Merchberger --- sysadmin, Iceberg Computers Recycling is good, right??? Ok, so I'll recycle an old .sig. If at first you don't succeed, nuclear warhead disarmament should *not* be your first career choice.