JSMESS is a port of the <a href="http://mamedev.org">M.A.M.E.</a> emulator, and shares the keyboard mappings of that system. Pressing the 5 key will insert a coin, and pressing 1 or 2 will represent Player 1 Start and Player 2 Start. Generally, arrow keys are used for joystick directions or to act like a paddle, and the CTRL, ALT/OPTION, and SPACE keys are for various buttons. If you wish to see what the current key mappings are for a system, press the TAB key and go to the key mappings menu.
