==> Larry Lippman @ Recognition Research Corp., Clarence, New York
==> UUCP: {allegra|decvax|rocksanne|rocksvax|watmath}!sunybcs!kitty!larry
==> VOICE: 716/688-1231 {hplabs|ihnp4|seismo|utzoo}!/
==> FAX: 716/741-9635 {G1,G2,G3} "Have you hugged your cat today?"
I would say that a terminal which can achieve full throughput at the higher
baud rates would be the exception rather than the rule. The "baud rate" is
not necessarily the "baud rating", but is simply a number which guarantees
that the sending and receiving units will be synchronized to a common clock.
This is absolutely necessary for serial communications since there typically
is no acknowledgement between the two devices on a character-by-character
basis (as with most parallel connections).
My advice is just set the terminal up for Xon/Xoff protocol and don't worry
about the throughput. I know that the AT&T 5520 terminals are notoriously
slow because when a screen scrolls up, they do a lot of data copying instead
of just manipulating pointer registers in hardware. I do not know if this is
the case with the 4425, but my (admittedly limited) experience with it would
lead me to believe that it does the same thing.
(As an example of what I'm talking about on the baud rate, try connecting
a serial printer up at >= 9600 baud and no protocol - I imagine the results
will be much worse)
Jim Greenlee
--
The Shadow
Georgia Insitute of Technology, Atlanta Georgia, 30332
...!{akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!gitpyr!jkg
I did some work a few years ago to "load down" a CSMA/CD LAN to see
what it really offered in throughput. One of my biggest problems was that
NO (text) terminal in the house could keep up. The only box fast enough
(Note this was 9600) was a $$$$ TEK graphics terminal. I do not recall
the # of it, but it had a 80286 aux processer built into it, if that helps.
It offered speeds up to 38.4, but I never found a fast enough source to test
that aspect.
--
decvax!cwruecmp!ncoast!wb8foz
ncoast!wb8...@case.csnet
(ncoast!wb8foz%case....@csnet-relay.ARPA)
"SERIOUS?
Bones, it could upset the entire percentage!"