Switches on {TAIL ~ the front panel} are connected to like designated inputs to {HEAD ~ PLA} 31 as shown 
Switches on { TAIL ~ the front panel } are connected to like designated inputs to { HEAD ~ PLA } 31 as shown
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH