[GreenKeys] [Bulk] Machine on auction site

[Richard]

In article <20110630184135.GE14690 at n0jcf.net>,
    Chris Elmquist <chrise at pobox.com> writes:

> On Thursday (06/30/2011 at 11:38AM -0600), Richard wrote:
> > 
> > In article <4E0B41C5.3000100 at gmail.com>,
> >     "tony j. podrasky" <tony.podrasky at gmail.com> writes:
> > 
> > > A silly old 9,600 Baud dumb terminal - [...]
> > 
> > I'm not even sure the VT05 can do 9600 baud.  That might be pushing it.
> 
> Actually, I believe the knob only goes to 11, err, I mean 2400.

Heh :-).  Digging a little deeper, the first model could only do 300!
You have to have the VT05B to do 2400:
<http://vt100.net/docs/vt05-rm/chapter1.html#S1.3>

> > Its DEC's first video terminal, so its a little more than just some
> > dumb terminal, but yes the seller's price is silly.
> 
> It does have cursor positioning ability on display and cursor keys on
> input so some amount of <ESC> sequence handling is done.

It doesn't have a microprocessor but does all that stuff in discrete
logic.  It doesn't use ESC as a command prefix, though, just a few
different control characters for a command prefix.
<http://bitsavers.org/pdf/dec/terminal/vt05/VT05_Engineering_Drawings_Jun71.pdf>

Commands require fill characters above 300 baud:
<http://vt100.net/docs/vt05-rm/chapter2.html#S2.7>
I haven't looked at the engineering drawings to see why, but the
documentation makes some mention of this being tied to the mains
frequency.
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