Review of the Reverse Video board from Cottage Technology (Houston, TX; $28.95 + S&H), with installation walkthrough: 4 wires soldered, 1 PCB trace cut, no need to remove circuit board from upper case. Describes optional SPST toggle or slide switch mod for switching between normal and reverse video. Warranty implications for new computers noted. Author offers to install unit for group members at no charge.
The Authoritative Website for Timex/Sinclair Computers