[HECnet] Disallow login on DZ line in VMS

[Thomas DeBellis]

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.
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