Apple III Serial Port: Cable pinouts for the DEC LA120

Apple III Serial Port: Cable pinouts for the DEC LA120

Apple III Serial Port            Cable       Printer Connector
 
Frame Ground ............(FG)...... 1  <-----> 1 .....(FG)
Transmit Data            (Tx) ..... 2  <-----> 3 .....(Rx)
Receive Data             (Rx) ..... 3  <-----> 2 .....(Tx)
Request to send          (RTS) .... 4  <-----> 8 .....(DCD)
Clear To Send            (CTS) .... 5  <-----> 8 .....(DCD)
Data Set Ready           (DSR) .... 6  <-----> 20 ....(TDR)
Signal Ground ...........(SG)...... 7  <-----> 7 .....(SG)
Data Carrier Detect      (DCD) .... 8  <-----> 4 & 5 .(RTS) & (CTS)
Secondary Clear To Send  (SCTS) ... 19
Data Terminal Ready      (DTR) .... 20 <-----> 6 .....(DSR)
 
NOTE: This is the standard Apple Modem Eliminator cable part # A3M0019.

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