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Apple //c 5 pin DIN                 DB25                  DB9 "AT" style

1 (1) DTR   Data Terminal Ready  -> 6  DSR                6  DSR
2 (4) TD    Transmit Data        -> 2  RX                 2  RX
3 (2) GND   Signal Ground        -  7  GND                5  GND
4 (5) RX    Recieve Data        <-  3  TD                 3  TD
5 (3) DSR   Data Set Ready      |-> 20 DTR                4  DTR
                                |AND 5 CTS Clear To Send  8  CTS  

My notes remind me that some 5 pin DINs have non-sequential numbering.
These numbers are in parentheses.

-- 
                 Michael Hickey, Canberra, Australia
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       --x--     sirius@spirit.com.au
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