Changes

U14 is an 8-channel mux/demux.  * Four of the channels (A0-A3) go to SP1. * (A4-A7 appear to go to SENS2-4, need to be traced) * Pin 3 is the common in/out, and goes to R13 (560k) and R15 (47k). R15 goes to U15 Pin 7 (555 Reset), and R13 goes to U15 Pin 8 (555 Control.) * Address Select 0 is connected to ST7 Pin 2 / PB0* Address Select 1 is connected to ST7 Pin 3 / PB1* Address Select 2 is connected to ST7 Pin 4 / PB2<br />