jsk@portia.Stanford.EDU (Jeffrey Kuskin) (12/01/90)
I am trying to use ZTerm 0.85 to do ZModem transfers over
a 19.2Kb serial link to a Unix host (a Sparcstation).
Downloading (Unix --> Mac) seems to work just fine. Uploading,
however, almost never works. At seemingly random points in the
transfer I get a "Got ZRPOS = 0" error in the ZModem
dialog, and the transfer stalls -- it keeps retrying and
keeps getting an error.
Furthermore, neither XModem transfers nor YModem transfers
work either -- usually XModem gives a "Got ACK on sector 0"
(or something close) error before any data is tranferred,
and YModem just quits right after it starts, again with no
data transferred.
The software on the unix machine is the X/Y/ZModem package
which I downloaded from the unix directory on the sumex-aim.
stanford.edu archive and compiled. It has this at the bottom
of the help screen:
sz 3.03 5-09-89 for V7/BSD by Chuck Forsberg, Omen Technology INC
"The High Reliability Software"
I have tried various options and none seem to help much.
Lowering the speed of the link to 2400 baud helps, but this
is not acceptable and does not cure the problem entirely.
I also tried checking the "Escape control chars" in ZTerm.
Questions:
1) What does "Got ZRPOS = 0" mean?
2) Has anyone else had these problems, and how can they be solved?
-- Jeff Kuskin
Stanford University
jsk@portia.stanford.edu