Modern processors are complex - the reference manual for 64-bit ARM processors is over 11000 pages long! - so we 're going to look at assembly lanaguage on a much simpler processor to get started. This processor is the 6502, a processor used in many early home and personal computers as well as video game systems, including the Commodore PET, VIC-20, C64; the Apple II; the Atari 400 and 800 computers and 5600 2600 video game system, systems; and many others.