PDP-11/05 returns to life

Tony Duell ard at p850ug1.demon.co.uk
Wed Jan 7 13:18:49 CST 2009


> With the onboard console, how hard is it to build a device to convert
> current loop into RS232 levels?

Not very difficult. You cna really cheat and grab TTL level signals off 
the pins of the UART (I don't think they're brought out on the connector, 
but you might want to check!) or slightly cheat and examine the current 
loop circuit and figure you you don't _have_ to use it as a current loop, 
there are significant voltage swings too,. That means your converter will 
only wrok with an 11/05, not any old current loop device, but that's not 
a problem

-tony



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