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The lesson is that batteries are good, but a source of continuous power is better than even a continous source of fresh batteries. For my circuit, having assured myself that the draw would be small enough, I even got IFI's ok, before requesting the august ones' blessing.
I was drawing power from the power to the multiple 100k joypots, which was on a relatively huge fuse, for the load I was drawing. ON THE OTHER HAND, the LED outputs that appear in the joyports may be powered from an internal supply which goes to logic, so overloading them may drag down the power supply to some function required to keep the OI working.
Note: the joypots don't go to ground, so their current varies as they charge a cap, and there is another resistor to limit the current when the pot is at minimum resitance.
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