I'm working on a project with an arduino and I'm looking to use the keyboard of a spare TI-84+ CSE. Would anyone happen to have a wiring diagram or information on the diagram that I could use? I feel as though I can write the software pretty easily for the matrix for the arduino if I can get the wiring figured out.

Thank you!
Let's see, we have one for the Casio Prizm, Muessigb was working on replicating the keypad PCB, and here's his complete PCB from earlier this year. I recommend either asking him in that thread or bringing him to this thread to see if he'll share his schematics of the current PCB's row/column layout. I'll add that the direct input ports suggest a certain 8x8 layout:
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