Acorn System 2 Technical Manual Introduction, parts list, and detailed electrical assembly instructions. http://www.chiark.greenend.org.uk/~bjharris/acorn/manuals/Sys2TM/contents.html

The Machine Room - Acorn System 2 Technical information. http://www.machine-room.org/computers/6361/

The Machine Room - Acorn A305 Photograph, description, technical details, trivia, and price information. http://www.machine-room.org/computers/9/