a short look at the motherboard picture shows that IRQOUT goes in SA1100 direction, the AD0 - backup battery voltage ? AD1/2 - grounded, AD3 - not connected. The IO pins used: IO1, 2, 5, 6, 7, 8, 9. One of them can be used as software reset. Does that also mean that the battery status is provided as digital input ? Oleg.