Here are the games I have tried so far. They are all old; most predate 1984. I am using a PocketPC2002 with a StrongARM 206Mhz cpu.

Galaxian
Space Invaders
Joust
Ms. Pac-Man
Jr. Pac-Man
Marble Madness

The following games have worked:

Space Invaders: Fails to achieve full framerate at odd moments, such as when starting a game and the score is flashing. Otherwise seems to run fine.

Galaxian: Does not achieve full framerate ever. Turning off throttling fixes the scratchy audio but slows things down by about a third. Considering I got full framerate on a Pentium 120 in the past, I suspect whatever is responsible for the lackluster performance is fixable.

Joust: Although this game works, it defaults to vertical mode, which leaves the sides of the display off-screen. Rotating the screen left has no effect. Rotating the screen right merely inverts it (vertically), which is no better than simply upright.

These games refused to load, in spite of the fact that all the roms are there - I tested each of them individually, without providing access to other archives, with Mame under Windows:

Ms. Pac-Man
Jr. Pac-Man
Marble Madness

What happened was the emulator sat with a black screen for a few moments, then gave up and returned to the menu screen.

I reiterate that I have tons of free ram so that is not the issue.

If anyone has any clue why this is happening (as I have to assume that this is not happening to everyone), I would love to hear some recommendations. Also, if there are other forums I should visit, please, inform me of them.