On Mon, Sep 5, 2016 at 10:30 AM, Peter Coghlan <cctalk at beyondthepale.ie> wrote:
 
 The usual answer, from back in the day, was to make sure hardware flow
 control was on and working at higher speeds. If you don't have that,
 you are going to lose > 9600 baud. I spent way too much time pulling
 fat cable to enable this after we'd wired the building with 3-wire
 cable for the VT52's and cute 'headphone' plug-in jacks back in my
 high school days...
 
 Generally, DEC didn't have hardware flow control at that time because it was
 not in the standard.  I'm pretty sure there was no hardware flow control
 available on the VT100.  It used XON/XOFF. 
 
I may be misremembering when we did this: with the VT100, VT102 or VT220's.
Warner