Help assigning controls

[Willard_Bones]

Hi, all!

  Almost finished with my MAME cabinet. It is a Defender repro, running Raspberry Pi 3, RetroPie. I have a dedicated Defender control panel, using an Ultimarc IPAC2.

  It will boot up, and it responds to the USB gamepad.  When I set up the controls, it registers input from the control panel. Until, I get to the "Left" and "Right" mapping. The Defender control panel has no L and R. It won't let me skip past.  So, I assigned the other buttons to buttons on the QWERTY keyboard. 

  It doesn't seem to work. I can start Defender, and it goes through the boot screen, etc, like it's ready to play. But, I can't start a game.

  Can someone give me some help, tips, direction - help me, Obi-wan, you're my only hope!!!

[Willard_Bones]

Nevermind.  I realized that I didn't insert a virtual quarter.  It's good, now!