Booting up!

This is the exciting part...
We will begin with testing and configuring everything before we build the cabinet

Refer  here for input map

1. After writing img. file to SD card, pop it into the Raspberry Pi
2. Navigate to 'Exit to Command line"
3. To update Raspbian type: "sudo apt-get update'
4. To upgrade Raspbian type: "sudo apt-get upgrade"
5. To update PiMAME to latest version type: "cd pimame_installer/" then press enter. Now type: "sudo ./update.sh" and after it's done updating, type "sudo reboot" to finalize and reboot into latest version.
6. To download joystick package type: "sudo apt-get joystick"
7. To make sure joystick is enabled: open advmenu.rc ("sudo nano .advance/advmenu.rc") and change 'device_joystick from' 'none' to 'auto'. Then 'ctrl X' to exit, 'Y' to save, and 'Enter' to return to command line.
8. Configure your Pi: "sudo raspi-config". Navigate through this tool to overclock, assign Audio ouput and expand file system. Select expand file system to acquire the full SD card capacity for storage, overclock to 'High' and select either HDMI Audio out or 3.5mm Jack Audio out depending on your sound set-up. Also go into international settings to change your local, timezone and keyboard language. Reboot to finalize.
9. Upon reboot, navigate to  'Exit to Command line" again and type: "startx". This will take you to the to Raspbian desktop.
10. Under accessories, open "File Manager" go to "/home/pi/emulators/pisnes" and open the "snes9x.cfg" file. Scoll down to #joystick axis. Change "JA_LR=0" and "JA_UD=1" to "JA_LR=2" and "JA_UD=3". (Solves joystick problems in the Pisnes emulator.) You can also re-map other buttons from this config text.

Now that all the all the configuration is done, we can now download ROMs into their respected folders in the "/home/pi/roms/" directory in the file manager. Either download on your PC, MAC or Linux machine and copy over to your Raspberry Pi or use the  Midori or Chrome browser ("sudo apt-get chromium") and download straight onto the Pi.