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Atari CX85 Numpad (USB modified
Findecanor:
The CX85 was supposed to connect to the Atari 8-bit computer over a joystick port.
When a key is being pressed it provides a keycode on the input pins while grounding the trigger pin (joystick fire button).
It is explained in the manual.
Tactile:
--- Quote from: solderdad on Mon, 02 May 2022, 12:24:37 ---I have a CX85 and want to do this. I cannot find a clear diagram of how to wire in the Teensy 2 to the keypad. Anyone have this diagram handy?
--- End quote ---
This is found in "matrix.c", one of the source files linked in the OP.
--- Code: ---// Ports for Teensy 2 / CX85
// row: PB0-4 (pins 0-4)
// row order: 4 2 3 1 0
// row pins: PB0 PB1 PB2 PB3 PB7
// col: PD0-3 (pins 5-8)
// col order: 5 8 7 6
// col pins: PD0 PD1 PD2 PD3
--- End code ---
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