Hook it up directly. -Adam "John A. Craft" wrote: > > I got one of the aforementioned BGMicro Trimble GPS receivers. The > documentation indicates the serial ports being "TTL Level", Using one of > the MAX chips it talks to the computer just fine. > > If I want to talk to the USART port of a 16C63, what's needed? Can I hook > directly? Seems strange to hook a MAX to the pic and a MAX to the GPS..... > > John C.