Msg: 1474 *Conference*

02-04-92 09:21:46

From: DREW BLANCHAR

To : RICK LOPES

Subj: REPLY TO MSG #1435 (M102 AS TDD)

Rick,
  This is something I started exploring back in 1986 when I first found the
world of TDD's necessary.
  
Problems: 1.  TDDs run at 55 baud (maybe 150 ? for newer models but 55 for the
majority) domestic and 57 international.  (Don't jump on me if I got the 57
wrong, as I don't have my notes handy).
 
2.  TDDs run at 5 bits.  Hey, we're talking UPPER CASE only.  Actually, they
use an in-band bit to switch to the 2nd 32 characters at each machine.  (Like
if I type [, we'll use A-Z and some punctuation, until I type ], then we'll use
the same 5-bit code to send numbers and other characters, until I type [ again.
Like control-S and control-Q for in-band start/stop.. In the bit-stream band
rather than hard wire control.  Got it?)
  
3.  For us reading on a MDL 100, it sound great, and it is.  More somebody
ready what we're sending without a hard copy print, we may be typing too fast.

  
Down at DCARA, one of the fellows has a program for his IBM clone that let's
him have a TDD window.  I just don't know if we can fool the MDL 100 into
working at those speeds and changing the ascII character-to-bits coding to
Bardot coding.
  
Besides, now that pocket-portable TDDs are under $150, with a 2-line
40-character LCD screen, I'm not sure which way to go? (Were I ever?
;)
-dB