and the 900k zip file was transfered back to riscos without error!
Seems like this is actually working now!
For the record:
kermit -8 -i -r <file> to trasmit file from unix cli to kermit client
kermit -8 -i -s to recieve to unix a file from kermit client
In the client:
set file type binary
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko