Because 4MB is way more than enough for the A/UX booting 7.1
Even 3MB might work, actually...
Sorry for the confusion. Of course I intend to do that. The configuration described just was my last (not working) testing setup :'(
Tried that, however, it won't recognize/accept the drive. The A/UX HD SC Setup does, I'll try it with that.
Happy Mac is displayed for a second, disappears for a second, then it starts over again.