Erik - Change D1 5.1 Vdc zener diode to regular diode.

Ijaz - 9VAC - PWR1 input source added.
     - Added a diode D6 1N4001 and changed U5 7805 to      
       7806 to match 6 VDC battery. 
     - Added a diode D7 1N4148 across reset capacitor C7

Cory - Changed output pin of U6 7809 from +5 to +9 VDC
     - Changed output pin of U2 7909 from -5 to -9 Vdc
     - P1.1 is protected by D1 and D4 1N4148 diodes      
       without any current limiting. The diodes 
       themselves provide the protection because they 
       can survive more current than the source can 
       output.