Quote:
Originally Posted by zero
Oh, that made me think... The joystick port is only rated for 50mA, where as USB is 500mA. My solution was to have a second USB port on the device that lets you connect a battery (the kind used to charge your phone).
How did you solve this? Just support USB devices up to 50mA?
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In reality, current limiting resistors on joy/mouse port of A500/600/1200 are 1/2 Watt, and in A4000 there is no such a resistor (pin 7 is tied directly to +5V), so the "nominal" current limit is 100mA.
As a pragmatic rule of thumb, tested with several hours of debugging, there isn't any issue if connecting devices up to rough 120mA (not continuous).
This includes all joypads I have tested (average 70-80mA) and mice (100-110 mA not continuous).
If one wanted to connect higher power-demanding peripherals, it is unavoidable to think to some external supply, like you are suggesting.
My opinion is that it is out of the scope of the adapter: there is no point in connecting a "6-axis 24-buttons double-sterero-earthquake-rumble" pad in order to play 2-buttons 8-directions games.