Connecting The Computer To The Printer/Interface.3 - Radio Shack TRS-80 Manual

Connecting the Computer to the Printer/Interface
The Printer/Interface and Computer are designed for easy connection to
each other. It is extremely important that you do not force the two
together or damage may result to one or both machines.
1. Turn both the Computer and Printer POWER switches OFF.
Important Note! It is essential that both Computer and Printer power be
OFF. If power is ON, the Computer may "hang up" (all keys inoperative).
If this occurs, press the ALL RESET switch on the bottom of the
Computer.
2. Remove the protective pin cover from the left side of the Computer
and snap it into place on the bottom of the Printer (see figure).
Snap into place here
3. Place the lower edge of the Computer into the "cradle so that the
Printer guides match-up with the Computer guide-slots.
4. Lay the Computer down flat.