Sincere thanks, guys. I finally got it to work last night by installing a completely different build (Steve Smith's triple-boot at http://www.multibootpi.com/). Still not sure what happened, as this setup just worked smoothly, ROMs transfer just fine, etc. THEN I had to learn about the wonders of HDMI sound being flaky on RPi, and adjusting the config file to activate it. Interestingly, it didn't work plugged directly into my small TV, but it works fine plugged through the receiver connected to my big TV.
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