...I wonder though, whether the 1400 even has the Adapter Sense circuits mentioned.

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Excellent question. As I write this I have a PB1400 running and charging powered from 24V with that shell just floating, no connection, as an experiment. To avoid an unfortunate incident extreme care is advised making and verifying the connections. I am using a standard stereo Y cable that has no shell contact and is inserted so its shoulder does not touch the PB1400 shell sensing metal. Kind of looks like there is no sense circuit. But I cannot be sure if it has some kind of sense circuit and power manager programming to stop charging in the airline adapter powered configuration for some worse case running load situation, say with a maxed out PB1400 with accelerated CPU and disk and CDROM going simultaneously. I suspect just carefully hooking up a regulated 24VDC source will work fine but cannot guarantee it. Should future experimenters see a failure to charge while running, I conjecture that just adding a single 412k ohm resistor sense shell to gnd would make their jury rigged supply more equivalent to the Yo-Yo design. Also, it may be that the more commonly available value 390K would work also.