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Old 15 August 2019, 13:08   #4
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Location: Dublin, then Glasgow
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The 2000 has a fuse to protect the ports, so you shouldn't do any more damage than blowing the fuse, though it's soldered in place so repair needs to be done by someone who can solder. On the 500 and later Amigas, there's a 4.7 ohm resistor on the 5V supply to the ports that limits current. While you can draw a fairly hefty current that could burn out the resistor after a short time, the useful voltage will drop as current increases, so you're more likely to simply not have a functioning controller. For example, at 100mA, the actual voltage available will drop to around 4.5V, which will start to cause problems for many TTL-based circuits. So, a few hundred mA might be perfectly fine for driving LEDs or something, but won't be much good for a device that needs 5V. 50mA should be safe for sensitive parts, probably dropping to around 4.7-4.8V, so it should be no problem for what you're thinking.

Edit: Also, the 2000's fuse supplies both ports, but the models with a 4.7 ohm resistor have one on each port, so loading on one doesn't affect the other.
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