MESS .135 is to computers and consoles as MAME is to arcade machines. i.e. It is an attempt to exactly emulate early computer and console systems. It is based primarily on the MAME source code so versions run in parallel to MAME. The reason MESS can use MAME as a basis is that most chips in computers and consoles are direct copies of arcade chips just connected a different way. In the guide you need to be aware of some terminology. If I use the word system it means the computer or console system being emulated. If I use the word BIOS it is meant to be for system roms or BIOS images used to get MESS working. Finally if I use the word software it means the rom/tape/disk etc… image to be loaded onto the system running in MESS. Download at our MESS page.