DEC VT20 boot device

[Noel Chiappa]

    > I didn't fully disassamble the program

I have now done so; the -YK is _exactly_ the same as the -YA (the later ones,
which are minorly different from what's in the manual), except that the HSR
address (177550) has been replaced as the primary device address by that of
DL11 #1, in the second block of DL11 addresses (175610).

In other words, the ROM is prepared to load something in bootstrap loader
format (which I have documented here:

  http://gunkies.org/wiki/PDP-11_Bootstrap_Loader

the one program known in this format is the absolute loader) over the
non-console serial line.

	Noel