22 Aug
2007
22 Aug
'07
6:04 p.m.
On Aug 22, 2007, at 6:01 PM, Tony Duell wrote:
I've just bought the base unit (VS240) for a VT240
terminal on E-
bay and
know little about it (OK, I know it's a DEC graphics terminal).
Perhaps
somebody can enlightent me
The VT240 is a nice terminal. Good score!
1) One site i looked at said a VT240 is a monochrome
unit, a VT241
is the
colour version. Is the only difference the monitor? Can I use a colour
monitor with my base unit?
Yes, the only difference is the monitor.
2) On the back are obvious connectors for an RS232
port (DB25),
current
loop (8 pin mate-n-lock). There's a DE9 labelled 'PR', presumably a
printer port, also RS232. A RJ11 keyboard socket, I assume an LK201
will
work here (yes?).
Yes, LK201. I've also used LK401s.
A BNC which seems ot be composite mono video. And a
DA15 plug, also for a monitor. I assume a VR201 links here, or a V241
with the right cable.
Yup.
Also, can I connect the keybaord to, say, the back
of the VR201, or do I have to use the RJ11 on the terminal itself?
I don't recall if that works or not...it's easy enough to try,
though.
On this board, there's an 8085, 2681 (dual serial
chip), 8251 (USART,
maybe used for the keybaord interface), 7220 (graphics chip) --
along with
what seemms to be much the same circuitry as a Rainbow colour card,
there
are a couple of PALs, I've not checked to see if they're the same
as the
ones in the 'bow. Pletny of RAM and ROM, and some glue logic. And
another
40 pin chip, DC310. For some reason this is saying 'processor' to
me. Is
it?
DC310 is the part number for the T11, isn't it?
-Dave
--
Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007