QM500 Lighting Control (1983 - ?)
90/180 channel memory lighting desk
QM500 90 channel: introduced in 1984. The 180 channel version followed in 1985.
From the Avolites website:
In 1983 the now famous Avolites QM500 series of consoles was created. The QM500 series consoles had computer memory and a very rapid flash button response time. No easy task with the processors available then!
Avolites QM500, now at Rose Bruford (see below) (from YouTube 2013)