K80, A Traditional Z80 with KIO


K80 is a traditional SBC design using a KIO (Z84C9012) and over-clocked to 22MHz. It also has 2 RC2014 40-pin expansion connectors.



  • Z80 with 64K EEPROM and 128K RAM,
  • Z80 overclocked to 22MHz,
  • EEPROM in four 16K banks, bootstrap from any of the 4 banks via jumper selection,
  • Sixteen 16K banked memory,
  • KIO, Z84C90, is the integrated I/O interface,
  • DS1302 Real Time Clock,
  • Compact Flash interface,
  • CP/M-ready,
  • Two 40-pin RC2014 expansion slots,
  • 100mm X 100mm, 2-layer PC board,
  • Designed for RC2014.


Design files

Schematic of K80

Gerber photoplots of K80

Altera EPM7064SLC44 design file


K80 Monitor. Hex file to be programmed in the W27C512.

CP/M2.2 for K80. CP/M2.2 BDOS/CCP/BIOS


Getting started with K80

K80 Monitor guide

Installing software on a new CF for K80

Pictorial Assembly Guide

builderpages/plasmo/k80.txt · Last modified: 2020/01/23 20:33 by plasmo
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