[GreenKeys] Current Loop to RS-232 Conversion on ASR33

[Jim Haynes]

On Mon, 18 Mar 2013, Christian Gauger-Cosgrove wrote:

> Wouldn't computer systems have trended to run an attached '33 as a full
> duplex terminal?
> 
Most of them did.  Now I remember the original Dartmouth/G.E. time
sharing system used half duplex - when you were about to type your
password it would type about 8 characters, CR without doing a LF,
type some more characters, and repeat a few times until there was a
thoroughly blacked-out area where you were going to type the password.
Of course when video terminals came along that trick was totally
useless.