*[[Media:6809E CPU datasheet.pdf|Motorola MC6809E CPU datasheet]]
*[https://colorcomputerarchive.com/repo/Documents/Books/Motorola%206809%20and%20Hitachi%206309%20Programming%20Reference%20(Darren%20Atkinson).pdf 6809/6309 Programming Programmer's Reference]
*[[Media:MC6821 datasheet.pdf|Motorola MC6821 PIA datasheet]]