tomcircuit created this retro computer board:

HD6309 Singleboard Computer

Hitachi HD63C09 clocked at a blistering 3 MHz with a capacious 64K of RAM! Retroputing bliss…

The design files and source code are available on GitHub:

tomcircuit/hd6309sbc

 

tomcircuit has shared the board on OSH Park:

HD6309 SBC