wayne@teemc.UUCP (//ichael R. //ayne) (02/15/89)
I agree that we need to collect whatever information we can
on the undocumented features of the TB+ modems. To this end:
Telebit has an undocumented register, S120. It may be set to a value
between 0 and 12. The smaller the number the smaller the packet size.
This was done to give fast echo response on direct access terminals.
I believe that this is only available in the 4.00 EPROMS.
Next?
/\/\ \/\/
--
Michael R. Wayne --- TMC & Associates --- wayne@teemc.uucp
INTERNET: wayne%teemc.uucp@mailgw.cc.umich.edu uunet!edsews!teemc!wayne
Operator of the only Michigan licensed 240 Horsepower UNIX machinedag@fciva.FRANKLIN.COM (Daniel A. Graifer) (02/17/89)
In article <37095@teemc.UUCP> wayne@teemc.UUCP (/\/\ichael R. \/\/ayne) writes: > ...Telebit has an undocumented register, S120. It may be set to a value > between 0 and 12. The smaller the number the smaller the packet size. >--[...] >Michael R. Wayne --- TMC & Associates --- wayne@teemc.uucp I have ROM version 4.00 in my Telebits, and would like to use this feature. An ATS120? gives me back a 0 (Zero). Does this mean some kind of default? What is a reasonable value for terminal (ie vi) use? Thanks in advance... Dan
denny@mcmi.UUCP (Dennis Page) (02/20/89)
[Inquiries concerning valuse for s112] That I know of, this register is only really useful when you have problems with your phone company or long distance carrier (such as Sprint). The most useful is s112=12, which disables micro packets. Micro packets (3-4ms) appeared in 4.0 roms and, combined with changing the short packets from 22ms to 11ms (also in 4.0 roms), are what really made the interactive performance sing. I can think of no good reason for changing s112 to anything other than zero unless you are having problems with the modems retraining or disconnecting. Settings for s112 that I know of are: 0 Any (normal) 1 Short packets only (2 bits) 2 Long packets only (2 4 6 bits) 3 Long packets only (2 bits) 12 Disable micro packets -- Never get off the interstate.