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From: Lars Brinkhoff <lars@nocrew.org>
To: jnc@mercury.lcs.mit.edu (Noel Chiappa)
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Subject: [TUHS] Re: Attempting To Build NOSC and BBN UNIXs + ARPANET code
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Noel Chiappa wrote:
> Did VDH PDP-11's have a special VDH interface, or did they simply use
> an off-the-rack DEC synchronous serial interface like a DU11?

Sorry, no idea.  I have only studied PDP-10 interfaces.

> Anyway, you don't want to use VDH.

If imp11a.c is beoynd repair, I'd say go with the ACC interface.  There
is documentation and a working emulator already exists, albeit for a
PDP-10.