The case has a slot for a DB9 plug (the side with the pins). Connect the DB9 plug to CAN_H and CAN_L of the CAN-hat; connect GND and 12V to the watchdog. Pinout is as follows: OBD2 DB9 4,5 GND 1,2 6 ...

two USB ports for two USB HID devices like mouse, keyboard or joystick/gamepad DB9 output plug to the joystick port of the CPC DB9 input to daisy chain an Atari controller (with power) Need external ...