> how much current on game port

You can draw 100+mA without problems but do not feed back ANY spikes or
pulses into that line (as caused by arcing contacts etc).

Cheap ports have no protection and you can draw the max PSU current from
them (50+A) for the first few miliseconds (after that it does not matter
anymore). Better ones have a polyfuse or a chip protector there.

Peter

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