sdlmame : arkanoid - left and right movements?

[honeybear]

Hello

I would like to move left and right the bar of arkanoid (revenge of doh) on mame. No way.

I have tried all the DEC / INC for x.

After press tab, what is the input that controls the movements?

thanks in advance

[MikeCyber]

I use Mame which works perfectly. However it's tricky to find the settings...even forgot how right now...tab maybe...:P