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BBC Micro User parallel Port pinout
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http://64.233.167.104/search?q=cache:6oS1QMzr0EMJ:gja.space4me.com/things/Recovering_My_BBC_Micro.html+BBC+Micro+User+parallel+Port+pinout&hl=en&ct=clnk&cd=5&gl=us&ie=UTF-8

Pin   Pin
(9 P) (25 P)    PC                              BBC           Pin
----- ------    --                              ---           ---
5     7        0V (Ground)                     Gnd (Ground)   1
2     3        RxD (Data in)   --------------  TD (Data out)  2
3     2        TxD (Data out)  --------------  RD (Data in)   3
1     8        DCD             ---+----------  RTS            5
6     6        DSR             ---+
4     20       DTR             --------------  CTS            4
7     4        RTS             ---+
8     5        CTS             ---+

(The +'s mean that locally on the PC DSR has to be connected to DCD and that RTS has to be connected to CTS.)


Pin numbering
-------------

PC:                                           BBC:
9-pin D-type       or: 25-pin D-type          5-pin Domino DIN-plug
                                              (male)
_____________      ______________                         _____
\ 1 2 3 4 5 /             \ 1  2 .  .  .  . . 13 /                       /            \
\ 6 7 8 9 /                 \ 14 15 .  .  .  25 /                    /    5     3  \
  ---------                     -------------------                     |         1       |
                                                                                 \    4     2  /
                                                                                    \            /
                                                                                        -----

The views of these figures are all from the outside (the backs of the computers) into the sockets,
i.e. they show the wiring sides of the plugs.

Here is another one

http://www.rtrussell.e7even.com/products/bbcwin/manual/bbcwinf.html

BBC Micro   PC   
DIN Plug   D25 Socket  D9 Socket   
pin A <

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