It's never too late to learn something about RSX.? ?
Seriously, all DEC operating systems are fair game here as they 
influenced and many times took ideas from each other.
Sometimes when I'm trying to understand something in Tops-20, knowing 
what VMS, RSX, RSTS and/or Tops-10 did really helps. /Really/ helps.
 
------------------------------------------------------------------------
 On 12/20/21 9:00 PM, Brian Schenkenberger, VAXman- wrote:
 I thought this was a question concerning VMS.
> ------------------------------------------------------------------------
> Johnny Billquist<bqt at softjar.se>  writes:
> In RSX, /NOTYPE_AHEAD just means you don't have any typeahead. If you
> try typing something when nothing is reading, the characters are just
> thrown away. But if a read is in progress, things works just as normal.