...

The other place is a memory address that Dan R. determined and explained to me a few weeks ago. There's a very simple equation to change it for different slots, which I completely forgot to do until another hour went by. It dawned on me while I took a bathroom break. :)

Is that what's called a "memory dump"? :-)

Something like that. :) The equation is reeeeeeeeeal simple: (provided 5-digit number) + S * 16. Dan previously reminded me to do the multiplication first. I ran back from the bathroom to the workshop area CERTAIN that it would work. Made the change and it still didn't work ... then I realized that when I'd stepped away from the table to go pee, I'd accidentally knocked the power cord loose for the Lego interface box. Re-attached that and NOW it worked.