Sega Master System II Instruction Manual page 6

Connections to TV/Monitor and Antenna
(Except French Model)
I In
BACK VIEW OF POWER BASE To RF Jack
RF Cable
RF Switch Box
Switch Box Antenna Cable
BACK VIEW OF TV SET
(75 ohm)
Antenna Cable (75 ohm)
If a single-plug antenna cable is plugged
into your TV (or if you have cable TV),
use the RF Switch Box.
1. Unplug the Antenna Cable from
the TV, and plug it into the RF
Switch Box.
2. Plug the Switch Box
Antenna Cable into the TV.
3. Connect the RF cable between
the RF Switch Box and the RF
Jack on the back of the Power
Base.
4. Finally, set the RF Switch to
"COMPUTER' position.
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