More on mystery system

[Marvin Johnston]

I have no idea if this will help, but a google search for "IEEE_SEND" 
brings up three references including an MT-488 PDF Technical Reference.

Chuck Guzis wrote:

> It doesn't correspond to anything that I can identify, including a
> PDP11.  I'm hoping that some HP aficionado will save me the time of
> plowing through a bunch of HP reference manuals trying to identify
> this thing.
>
> Again, it might not be HP at all, but the GPIB references may be a
> clue.