30 Aug
2004
30 Aug
'04
1:03 a.m.
At 08:20 AM 8/30/2004, you wrote:
I was thinking of the DEC terminals like the VT52.
But something was nagging at me and I went and looked at the prints.
The DEC DLV11-J, a 4 port unbuffered SLU had a clock I/O pin on it's Berg
connector.
It could output the 16x internal baud clock on that pin to drive a terminal,
or accept a 16x external clock from a terminal, for each UART.
I don't know that any DEC terminals had an external baud generator however.
But if they did, they could have driven the DLV11-J as you say the HP
systems worked.
I've wired a zillion DEC terminals and berg connectors only using 3 wires
(tx, rx, ground).
Sent the entire Matanuska Electric Co-op (Alaska) database from a Datapoint
system to an 11/70 over 1 wire.
(yup, no handshaking - blow and go)
http://www.macro-inc.com/MatanuskaConnection300.jpg
Ed
I don't
think it would have worked,
at least with unmodified DEC hardware I was familiar with, but YMMV.
You might dial up the baud rate on the terminal side,
but the computer side baud rate was usually fixed with solder jumpers.
Actually, it probably would have worked, as a common (although not required)
setup for HP terminals was that the serial interface in the host was set for
external baud rate, and the terminal provided the clocking. So while I can't
go from experience because I don't have a 264X terminal yet, I suspect it
would work. 