Hardware Required to interface serial port on PC to MMJ conector on LA75:
- H8571-J adaptor
- BC16E-xx cable

The connection between the DECpc 9-pin and a LA75 MMJ is as follows:
    
		PC 9-pin                LA75 MMJ
		--------                --------
		  CD - 1                
		  RD - 2<-------------->2 - TX+ (Send Data)
		  TD - 3<-------------->5 - RX+ (Receive Data)
		 DTR - 4<-------------->6 - DSR (Data Set Ready)
		  SG - 5<-----------+-->3 - TX- (Send Common)
				    +-->4 - RX- (Receive Common)
		 DSR - 6<-------------->1 - DTR (Terminal Ready)
		 RTS - 7
		 CTS - 8
		  RI - 9
    
    Note:  DSR is not used by the LA75.  However, CS said that this is the 
	   "standard" serial connection.  Therefore, DSR on the MMJ should
	   be strapped to DTR on the PC.  CS stated that this is the
	   connection scheme for the H8571-J connector.