This topic reminds me to ask - are there any deeply detailed docs for
DEC terminals out there? I'm thinking of schematics for VT100s
through VT240s (since I have just about one of everything). One
"project" I just thought of was to take the board from a real VT220
and wrap it in just enough stuff to be able to plug either an LK201 or
a modern PS/2 or USB keyboard into one end, and a VGA monitor into the
other end - keyboard conversion would most likely take a
microcontroller, and converting the video to something at 31KHz (VGA
frequencies) might be a bit cumbersome to do (perhaps by grafting on
an Amiga flicker-fixer-like circuit), but to have a brick about the
size of a hardback book that one feeds +12VDC to, that _is_ a real
terminal, might be an interesting thing to have around the house. One
could drop it onto a KVM or just put it in ones toolbag as a portable
terminal, to be used with a keyboard and monitor already at the
destination site. A VT240 slab is reminiscent of this, in that it
doesn't have an integral monitor, but it's a lot larger than a wrapped
VT220 mainboard would be, and they aren't as common as VT220s.
Perhaps this is yet another thing better done with a microcontroller
and emulation software, but it's mostly a hardware project to take an
existing, known-compatible board from a classic product rather than to
roll one's own.
-ethan