FWIW since GVM now supports SD cards I thought I'd try LJP (Little John Palm), the game emulator for Palm OS that emulates:

Nintendo Entertainment System (NES)
Super Nintendo Entertainment System (SNES)
Nintendo Gameboy/Gameboy Color (GB/GBC)
Sega Genesis/Megadrive
Sega Master System (SMS)
Sega Game Gear (GG)
Bandai Wonderswan/Wonderswan Color (WS)
NeoGeo Pocket/NeoGeo Pocket Color (NGP)
Atari 2600 (VCS)

I was amazed to find that it does run,....sorta. It does NES emulation no problem (iNES for the tablets displays better). However, it runs out of memory trying to load any SNES or or Sega Genesis ROMs that I tried. As far as the other systems that it can emulate I didn't have any those game ROMs so I couldn't test them right now.