I'm not sure if its the correct way, but these two ways worked for me.
The first is to install mame on your desktop and run the game you are having a problem with. Then copy the .cfg file that was created for that game from the cfg directory(desktop) to the cfg directory on your PocketPC.
The second is to buy a keyboard. I found a real cool one that folds up called Stowaway.
> I am running MegaCE3 on my Jornada 568 and love it! It works great for most of
> of the games I have tried. But there are some games (Defender, Zoo Keeper, Qix,
> Joust etc.) that seem to work but start up in system config or test mode and I
> can't get them to play. The only key that seems to work in this mode is the
> button to return to the main Mame menu. None of the other buttons seem to have
> an effect to navigate the particular game's test menu or kick it back out to
> normal game operation.
> It sounds like many many people with the same Jornada are playing these games
> without difficulty. What is the trick to fix this? I have looked for a .cfg
> file but have not found a general one in the mame directories on the Jornada.
> The game files (e.g., defender.cfg) seem to be in a binary format rather than
> something I can edit in notepad.