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Mertec Compact Companion (front)
The front of the Mertec Compact Companion shows, from left to right, the Analogue and User port. The 2MHz Bus port is just viible on the right.
Mertec Compact Companion (back)
The back of the Mertec Compact Companion shows the white cable that plugs into the Master Compacts Joystick/Mouse port and the edge connector which fits onto the Master Compacts PCB Extension.
Mertec Compact Companion circuit board
The Mertec Compact Companion circuit board has an NEC D7002C to control the Analogue and an MC68821P for the 2MHz Bus port . The ROM contains a menu application to control the enabling and disabling of the Compact Companion features, the commands are describled in the Specification of Mertec Compact Companion.
Mertec Compact Companion fitted (side)
The Meretec Compact Companion fitted to a Master Compact withnthe white cable plugged into the Joystick/Mouse port.
Mertec Compact Companion fitted (back)
A better view of the cable connecting to the Joystick/Mouse port.
Mertec Compact Companion fitted (bottom)
The bottom view showing the edge connecter connect to the Master Compact PCB Extension and one of the 2 screws which holds the Compact Companion in place.
Here are the Mertec Compact Companion Fitting Instructions and Specification of Mertec Compact Companion .