Saludos amigo pac-quito , este es ini que yo tengo y si me funciona con un pad de psx

### INPUT MAPPINGS ###

# main form
UP_1_GAME "DIK_UP ¦ JOY1_UP ¦ MOUSE_UP"
DOWN_1_GAME "DIK_DOWN ¦ JOY1_DOWN ¦ MOUSE_DOWN"
UP_1_PAGE "DIK_R"
DOWN_1_PAGE "DIK_F"
UP_1_LETTER "DIK_LEFT ¦ JOY1_LEFT"
DOWN_1_LETTER "DIK_RIGHT ¦ JOY1_RIGHT"

FIND_GAME "DIK_TAB"
RANDOM_GAME "DIK_LSHIFT"
SELECT_EMULATOR "DIK_Z"
NEXT_EMULATOR "DIK_4"
PREVIOUS_EMULATOR "DIK_6"
SELECT_GAMELIST "DIK_X"
NEXT_GAMELIST "DIK_3"
PREVIOUS_GAMELIST "DIK_5"
ADD_GAME_TO_LIST "DIK_A"
REMOVE_GAME_FROM_LIST "DIK_S"
MENU_SHOW "DIK_2"
MENU_LOCK "DIK_LALT & DIK_2"
LAUNCH_GAME "DIK_1 ¦ JOY1_BUTTON1"
LAUNCH_GAME_WITH_OPTIONS1 "DIK_LCONTROL & DIK_1"
LAUNCH_GAME_WITH_OPTIONS2 "DIK_LALT & DIK_1"
LAUNCH_APP_1 "DIK_C"
LAUNCH_APP_2
LAUNCH_APP_3
EXIT_WITH_CHOICE
EXIT_TO_WINDOWS "DIK_ESCAPE"
EXIT_AND_RUN_APP
EXIT_AND_REBOOT
EXIT_AND_SHUTDOWN

# options form
OP_UP_1_OPTION "DIK_UP ¦ JOY1_UP ¦ MOUSE_UP"
OP_DOWN_1_OPTION "DIK_DOWN ¦ JOY1_DOWN ¦ MOUSE_DOWN"
OP_UP_1_OPTION_PAGE "DIK_LEFT ¦ JOY1_LEFT"
OP_DOWN_1_OPTION_PAGE "DIK_RIGHT ¦ JOY1_RIGHT"
OP_MENU_SELECT "DIK_1"
OP_MENU_BACK "DIK_2"
OP_MENU_HIDE

# screensaver form
SS_SHOW_TRACK_NAME "DIK_2"
SS_FIND_N_SELECT_GAME "DIK_1"

# any form
PREVIOUS_TRACK "DIK_LALT"
NEXT_TRACK "DIK_SPACE"
REWIND_TRACK "DIK_Q"
FF_TRACK "DIK_W"


### SETTINGS ###

# 0 or 1 (off / on)
keyboard 1
mouse 0
joystick 1

no lo pongo completo por que lo de mas creo que es de calibrar el joystick, puede ser por la version de mamewah que uses, pero dudo mucho que sea esto. Espero que esto te ayude, pasando a otra cosa de que parte de mexico eres, yo tambien soy de mexico, de reynosa , tamaulipas para ser mas exactos.
saludos