From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue, 14 Apr 1998 15:21:27 +0100
From: forsyth@caldo.demon.co.uk forsyth@caldo.demon.co.uk
Subject: [9fans] styx and 9p
Topicbox-Message-UUID: 75942bfe-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19980414142127.DNEbsqkC5qXuf_7w1iUA-neEp67KD315W6mMMV6bing@z>

styx is quite close to 9p, as you can see from its definition in the inferno books.
here are the differences i can recall:

authentication is a separate phase before styx starts:
thus the connection is authenticated, not each Tattach.

the append and lock mode bits aren't there.

Tsession/Rsession aren't used.

the message numbering (Txyz and Rxyz) is different.