Original System: Atari 400/800
Also known as the game everyone uses to calibrate their 5200
joysticks, the Atari 5200 version of Missile Command is a direct
port of the Atari 400/800 version except that the Atari
copyright is missing from the title screen. This is
because the Atari 5200 already has a separate splash screen
which displays the copyright before the game starts.
Although Atari could have redesigned the game to take advantage
of the 5200's second fire button and keypad to closer imitate
the controls of the arcade game, they chose to release the
400/800 version instead.
Interestingly a PAL prototype version of 5200 Missile
Command has been found. While the 5200 was never
released in PAL territories, this prototype proves that it was
indeed planned for release overseas. The PAL 5200
version of Missile Command is the same as the NTSC version but
with the scanlines and timings adjusted for PAL TVs.