MAKE SURE YOU BACKUP YOUR ORIGINAL FILES! Then try this:
##########Go to \share\system\configs\reicast open file controllerP1.cfg or create it if you dont have it with below:
[compat]
btn_trigger_left = 310
btn_trigger_right = 311
[emulator]
mapping_name = Sony PLAYSTATION(R)3 Controller
btn_escape = 316
[dreamcast]
btn_b = 305
btn_a = 304
btn_x = 308
btn_dpad1_up = 544
btn_start = 315
btn_dpad1_down = 545
btn_dpad1_right = 547
btn_y = 307
axis_y = 1
axis_x = 0
btn_dpad1_left = 546
##########Then open or create emu.cfg with:
[MK-5106150]
Dynarec.Enabled = 1
aica.DelayInterrupt = 0
software.name = QUAKE 3 ARENA
[T1202N]
Dynarec.Enabled = 1
aica.DelayInterrupt = 0
software.name = MARVEL VS.CAPCOM
[audio]
backend = auto
disable = 0
[config]
Debug.SerialConsoleEnabled = 0
Dreamcast.Broadcast = 4
Dreamcast.Cable = 3
Dreamcast.RTC = -2103085832
Dreamcast.Region = 3
Dynarec.Enabled = 1
Dynarec.idleskip = 1
Dynarec.unstable-opt = 0
aica.LimitFPS = 1
aica.NoBatch = 0
aica.NoSound = 0
bios.UseReios = 0
pvr.MaxThreads = 3
pvr.Subdivide = 0
pvr.SynchronousRendering = 0
pvr.rend = 0
rend.Clipping = 1
rend.UseMipmaps = 1
rend.WideScreen = 0
ta.skip = 0
[input]
enable_x11_keyboard = 1
evdev_device_id_1 = 18
evdev_device_id_2 = -1
evdev_device_id_3 = -1
evdev_device_id_4 = -1
evdev_mapping_1 = /userdata/system/configs/reicast/controllerP1.cfg
[players]
nb = 1
[pvr]
nox11 = 0
[reios]
ElfFile =
[testing]
ta.HashCheckFile =
ta.HashLogFile =
[validate]
OpenGlChecks = 0
[x11]
fullscreen = 0
height = 480
width = 640