Date   : Tue, 23 Sep 1986 11:27:56 EDT
From   : SAGE@LL.ARPA
Subject: What is a Z System

Z-System is the name of the CP/M-replacement operating system from
Echelon, Inc.  It uses Richard Conn's ZCPR3 for the command processor
and Dennis Wright's ZRDOS disk operating system (replaces the BDOS).  This
is the state-of-the-art operating system for Z80 (and NS800 and HD64180
and even 8080 or 8085) computers.  If you are not using it, you should
definitely look into it.