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Donn Stewart
13917 Deviar Dr
Centreville, VA 20120

Designing, Building, and Selling Obsolete Computers -- for Educational Purposes -- since 2004

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Code for installing and running CP/M on the CPUville Z80 kit computer

The CP/M operating system was the first commercially successful disk operating system for microcomputers. As such, it recently received designation by the IEEE as a Milestone in Electrical Engineering and Computing. See the article at http://theinstitute.ieee.org/tech-history/technology-history/groundbreaking-operating-system-is-named-an-ieee-milestone. This operating system was designed by Gary Kindall in 1974, to run on microcomputers with an 8080 processor and 8-inch IBM floppy disks. However, it was designed to be portable to many different machine architectures, by having a machine-dependent, customizable basic input-output system (CBIOS) that had the software to operate the disks, console and other peripheral hardware, and a machine-independent basic disk operating system (BDOS) and console command processor (CCP), to process commands and create and use a disk file system. Since the 8080 processor uses a subset of the same machine code as the Z80, CP/M could be used on both 8080 and Z80 machines. CP/M use spread to a wide variety of machines using a wide variety of disk drives and peripherals. Eventually, the introduction of 16-bit microcomputers using MS-DOS made 8-bit microcomputers (and CP/M) obsolete, but it is still used and enjoyed by hobbyists and educators using 8-bit Z80 or 8080 systems.

As mentioned in the disk and memory expansion kit instructions, CP/M itself is not yet in the public domain, and must be downloaded from the site licensed to distribute the source code, and assembled by you. Then you need a number of programs to test the memory expansion, and to load CP/M onto the disk for use in the Z80 computer. Here are the programs for download:


Listings of these files can be found in the Disk and Memory Expansion kit instructions.

PCGET and PCPUT file transfer utilities

These programs allow XMODEM-protocol transfers over the serial port onto the CP/M disk. For detailed information on using them, consult the disk and memory expansion kit instructions

PCGET assembly language file
PCGET list file
PCGET binary object file

PCPUT assembly language file
PCPUT list file
PCPUT binary object file

How I got CP/M installed and running on this new Z80 computer