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getting old is mandatory growing up is optional.
unofficial pikey runs on 3.x and 4.x kernels, but the slim doesnt have an ir port, but you may be able to modify the pikey software and have a version pureley for the sio port for this purpose.
I am not a PSP coder so if you know anyone that is willing to take that on, I have 5 PSP slims and one chatpad ready to go....
I will open the chatpad and look at the circuit in it. See if I can dump the codeso I can save it before re-flashing it to connect it directly.