isen

Can anyone point me to a guide for using the Atari800 emu for Mac OS X? I have the program and several OS ROMS and games ROMS. What is the best set-up to use for 1) using the emu to play games and 2) as a computer? Is game playing satisfactory using the keyboard or mouse instead of an external joystick? How do I determine what type a cartridge ROM is? (to answer the question that appears in the dialogue box when I insert a cartridge). Thanks for answering this and for any other help you can give. Cheers, isen