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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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A Z80 Microcomputer Kit System

I have for sale an educational 8-bit computer kit which uses the Z80 for its central processing unit (CPU). This microcomputer kit is based on designs made popular by Steve Ciarcia in his book Build Your Own Z80 Computer, Byte Books, 1981. I created this kit in response to requests by site visitors for an simple way to build a Z80-based computer. The best way to get familiar with the kits for sale here is to read the kit instructions. If you are interested in purchasing a kit, or have any questions, please email me. I look forward to hearing from you.
photo of assembled computer kit

This is the main computer kit. It has the Z80 processor, 2K ROM, 2K RAM, two input ports, and two output ports. Price: $45.00    More information...

photo of assembled bus display kit

This kit is the computer system bus display. It allows you to watch the activity on the computer system buses while the computer runs on the slow clock speed. Price: $24.00   More information...

photo of assembled serial interface

This kit enables the Z80 computer to communicate with a dumb terminal or a PC running a terminal emulation program and use its keyboard and display for text input and output. Price: $25.00   More information...
photo of assembled disk and memory expansion kit

This kit adds memory up to the full 64K that the Z80 can address, and provides an IDE disk interface, so that the CP/M operating system can be installed. Price: $36.00   More information...
photo of assembled logic probe

This is a simple test instrument that allows you to see the logical state of any pin in the computer while it is running. It is useful for understanding the system, and for diagnosing hardware problems. Price: $8.50   More information...

I also have for sale power supplies, bare boards for hobbyists with lots of parts on hand, extra pre-programmed EPROMs, and a Tiny BASIC interpreter on an EPROM.   More information...