I'm having the same problems, have tried multiple ROMs. Noticed in the help files there should be a gx.dll in the /windows directory, but there isn't, i can't find this file anywhere..
I also have an HP 525 (jornada)
> Im having problems running any MAME roms on my HP525. I have everything in the
> right place. I start out the MAMECE3, load any of the roms that i have and it
> starts, but a black screen shows up. I have 10 megs of program space free. Any
> suggestions are welcome. Please reply