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Atari CX85 Numpad (USB modified

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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.


--- 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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