> On Nov 30, 2015, at 9:14 PM, william degnan <billdeg...@gmail.com> wrote:
>
> I have an 11/05 with ASR 33 for I/O. I am using the M9970 console card to
> make the connection. I have loaded papertape BASIC into core (16K) and it
> boots up from 000 000 to the TTY, I can type in programs, etc.
>
> Question - I'd like to switch over to a VT 50 in 20ma mode. Not sure if
> this is possible based on what I read here:
>
> http://www.retrocmp.com/how-tos/interfacing-to-a-pdp-1105/144-interfacing-with-a-pdp-1105-sorting-the-wires
I'm not sure I understand the question correctly. That article clearly points
out the 20 mA wires, and presumably that's where your ASR33 is connected. 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".
paul
