When oorexx was open sourced from IBM, the ftp package did not go
out as well. The FTP package is now rewritten for the open
source package, but does not support IBM 4690 OS well.
I have modified the rxftp.cls file to support 4690 OS. This
includes using the correct list command and only sending the
password when it is not null (IBM 4690 supports anonymous
login with no password).
The attached file has proposed changes in it, marked with my
initials RSH in comments (/ RSH /).
The changes support login without a password, but, I can see
where you would want to support the existing function for
the other OS's, so, it may be that only supporting anonymous
login w/o a password should be restricted to IBM 4690 OS.