At 23:46 06/05/97 -0500, Troy Powledge wrote: >1. What is the simplest bus to implement? By this I mean, what chips are out >there to implement this bus and how difficult is the programming? Probably the simplest (in terms of readily available chips) is RS485. You just put a driver chip (like for RS232 -- the main difference is that you have to control the direction, as it is half-duplex) at your serial ports, and then you use just normal asynchronous communication. You have to invent (or copy) a protocol that allows your master to address his slaves, send some data to them and possibly get something back from them. Gerhard