It's a
genuine Atari
brand joystick, P/N CX-40, in the box, with manual, for a TRS-80 Model III.
It has what appears to be a 40-pin edge connector on the end of the cable
Are you sure it's 40 pin and not 50 pin? The are (AFAIK) no 40 pin
connectors on a Model 3 (unlike the model 1 that uses them for
everything).
I counted twice. It's 40.
The most likely places to plug a joystick in would be
the system bus (50
pin) or the printer port (which has 8 input lines on it), which is 34 pin.
Model 1:
The manual says to plug it into the "front left output port, sometimes
referred to as the "Screen Printer Port"", on Model 1's with an
Expansion
Interface. "For computers without an EI, plug the TRSSTICK on the port
on the back of the keyboard, near the reset button."
Model 3:
"Firmly push the connector onto the large 50 pin bus located in the center of
the bottom of the computer..."
Apparently, this is a Model I, not Model III joystick. My mistake. Thanks,
Tony, for bringing this up. The bulk of the manual is devoted to the
Model III, so I didn't even notice that it had the wrong number of pins to
fit.
-ethan