Steve Mayer and Ron Milner built this prototype system for the Atari 2600 Video Computer out of a standard “Jolt” card that used the 6502 microprocessor. The primitive video hardware gave it a reputation as one of the most complex machines to program. Developers wrote and assembled software on a DEC PDP-11 minicomputer, and then downloaded it for testing. The first program developed, a forerunner of the classic “Combat” video game cartridge, shipped with the 1977 release.