====== Sigma Research ======
Sigma Research were based in Cambridge and sold three items:


[[qlwiki:Sigma Research Joystick Adaptor]] - Converted the QL's BT style joystick ports to work with a standard Atari (9 pin D) joystick port\\ 
[[qlwiki:Sigma Research Parallel Printer Interface]] - A Centronics interface\\ 
[[qlwiki:Sketch Pad]] - A graphics drawing program\\