Date   : Thu, 10 Mar 1983 0849-:00CST
From   : John Otken <CC.Otken@utexas-20.arpa>
Subject: Re: Rainbow 100 and file transfer

I just wrote a file transfer program for UT which works in a manner
similar to what you described, Jerry.  Except it is really intended to
do micro - mainframe transfers (MODEM7 didn't quite fit the bill).
There is no reason it can't do micro - micro transfers but, since we
have only one micro, I can't test that aspect.

It uses intel hex as the transfer protocol EXCEPT that I have added
ACKs and NAKs.  If you just want to send intel hex w/o ACKing and
NAKing then comment out a few lines and presto!

The program is in FORTRASH (at least the file transfer subroutines)
and since we have made the same source work under CP/M, TOPS20, UNIX,
VAX VMS and our own CDC Cyber O.S., I'd say its portable.

It's all done sans the spit and shine on the documentation (take a
week or two) and anyone who wants it may have a copy.  Although, as
you can guess, it is SLOWer than MODEM7.  But it takes about three
days to bring up on a different host, a claim I don't believe can be
made by non-CP/M MODEM7 users.  This program is a real idiot, by design.

John.