Interfacing PDP 11/05 to VT 50

tony duell ard at
Tue Dec 1 11:39:16 CST 2015

> The VT50 comes (according to the peripherals handbook) with a standard 20 mA
>  interface, optional RS232 interface.  So it sounds like it would be a matter of finding
>  where the 20 mA connector on the VT50 is, and plugging into that.
> Interestingly enough, the VT52 is listed as supporting either kind of interface, but only
> one; "specify at time of order".

I suspect it's the same as the VT55 which I have. That terminal has a little daughterboard 
on the main logic board which contains the interface buffers etc. Mine is 20mA 
current loop, I assume the RS232 interface is a simialr daughterboard that replaces it.

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