@iniche Thanks for the info and recommendation. I ended up buying a Kazzo recently. It was cheap enough. And it seemed like a fun and rewarding project. bunnyboy, of RetroUSB, wrote this about it:
"I didn't bother with copy protection, but its a custom mapper so Retrode won't work without some reprogramming. The ROM is a standard flash chip so you can dump it with a programmer after transplanting it to an adapter board."
Then I found this Kazzo tut at NeoGAF:
http://www.neogaf.com/forum/showthread.php?p=72806661But no successful dump for me yet. No dump of any kind. Seems I need to know the mapper. I might email cah4e3 back. He seemed confident that he could successfully dump it.