Game controls using a Leonardo.

I saw some projects and shields to make game controls using a Leonardo.
I have an old "flightstick" joystick (the ones made for the 15 pin game ports) still lying around.
I'm able to get the pinout of him and the arduino, what i'm unable to understand is if i can plug the joystick directly or not.
As example, the old analog imputs were driven by 100Kohm resistors, while the joystick shields for the arduino uses 10Kohm. Will they draw too much current?
Also the buttons signals: in my joystick are multiplexed, as they are about 10 plus the hat, and there's a PIC and two multiplexers on the circuit board; are they safe to be pluggeg on the Leonardi digital inputs?
Could i have some help?


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