Hi again,
I am trying to find out what the 15 pin expansion port +5V pin output is rated for in milliamps. If anyone knows the exact amount please let me know.
Thanks.
You're limited by the AC adapter, the voltage regulator, and the PCB trace width. In that order.
You take how much current your famicom needs and subtract that from the ac adapter output capability. That's your budget.
I don't know how much current a normal famicom needs off the top of my head. Would be good to measure or see if someone else has measured it