-=> Quoting Roy J. Tellason to Leonard Erickson <=-

 LE> Well, consifder that the TTY units used 20 mA current loop in many
 LE> cases, /*not* RS-232. (BTW, the old IBM PC Asynch cards have
 LE> jumpers for running them as 20 mA current loop instead of RS-232!
 LE> They use pins not used by RS-232)

 RJT> The first system I worked with was like that,  used a DECWriter as a
 RJT> system console.  Then there were devices out there,  somewhat earlier
 RJT> I guess,  that used a 60mA current loop. 

I have several of those old cards. And the pages for the PC's manual as
well. Which is where I found out about the jumpers.


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