23 Mar
2000
23 Mar
'00
8:51 a.m.
On Mar 23, 13:40, Cameron Kaiser wrote:
Speaking of teletypes, I ended up with a matching set
of Philips TX-1000
Text Tells which are, I guess, meant for teletext transfer over phone
lines.
(The manual and the machines are Dutch.) Anyone ever
dealt with these?
Know the communication protocol, or are they just like any other
traditional
modem when they transmit/receive?
The type number looks familiar, but I can't be certain. What do they look
like? I expect they'll be V23 Mode 2 (1200 baud FSK receive using
2100/1300Hz, 75 baud FSK transmit using 450/390Hz CCITT tones). If they're
what I think they are, they can be programmed with a number to dial, a user
ID and a (numeric) password which is sent on receipt of a ctrl-E (ENQ) from
the remote end, but it should also be possible to use them manually.
Ob.pedantry: it would be Viewdata (comms channels), not teletext
(broadcast).
--
Pete Peter Turnbull
Dept. of Computer Science
University of York