ZsDOS, GPL Release and Utilities
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ZSDOS (Z-System DOS) and the Companion ZDDOS (Z-System DOS with Embedded DateStamper) are enhanced replacements for the CP/M 2.2 Basic Disk Operating System. ZSDOS was a commercial product sold from 1988 through 1998 when the complete package (including source code) was released under the GNU General Public License. These four packages comprise the GPL release:

      ZSDOS1.ZIP - ZSDOS/ZDDOS Source Code 

      ZSDOS2.ZIP - Support Executables and misc files 

      ZSDOS3.ZIP - Ascii version of Manual (Formfeeds delimit pages) 

      ZSDOS4.ZIP - Source Code of key utilities 

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(24 Feb 2002) Local Area Networking can be performed on 8-bit systems as well as larger computers. It can be added to systems running the banked version of ZSDOS with minimal hardware, and just a little software. Here is a package originally developed in the mid- 1980s for a class I was taking, and polished to this form in 1985 for the Trenton Computer Festival presentation.

      CHEAPLAN.LBR - A simple CSMA/CD LAN for ZSDOS systems