BBC printer port (ever used for anything else?)

From: Tony Duell <>
Date: Sun Sep 19 13:32:12 2004

> > Ah yes, that stupid quincuncial DIN plug. Fits both ways up, only 1
> > works....
> Just do what I did and solder a db9 onto the pads with flying leads. :D (and

You mean a DE9, but anyway...

> yes, the DIN plug is still in place and works)

I'd probably do that on a normal Beeb, but this is an Acorn Cambridge
Workstation. And while I don't normally worry about modifications, this
machine is sufficiently rare that I don't want to do anything
irreversable to it (I don't mind soldering bits on the circuit boards,
doing the sideways RAM hack, etc, but I don't want to cut holes in it.

I have made up a serial cable anyway, I just have to remember to plug it
it the right way up.

I have never figured out the reason for the pinout of the Beeb serial
port. The Tatung Einstein [1] uses the same connector, but the wiring is
sane in that turning the plug over swaps TxD with RxD and RTS with CTS,
thus giving the null-modem swap.

[1] A machine that has a few Beeb-related jokes in the design. The
Einstein's system bus is called the 'Pipe', Acorn called the second
processor interface the 'Tube'. That itself was a joke -- the Tube is a
slang neame for the London Underground (Subway to you guys across the
Pond), which of course is an alternative to the bus....

Received on Sun Sep 19 2004 - 13:32:12 BST

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