Defender

Defender
Defender | Robotron 2084 Guidebook

Williams Defender arcade game - instructional video - Red ROMS, factory settings - modolief

Defender's Extra Life Bonanza - Don Hodges

Protector for the Vectrex - Vector graphics port of Defender by 	Alex Herbert

Stargate
Williams Stargate (Defender 2) Instructional Video -- 1981 arcade game, original equipment - modolief