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