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Halo may have made its way to the Atari 2600, but wouldn't porting a retro game to this '70s-era console be more appropriate? MAKE Magazine has the skinny on former Atari dev Scott Williamson's port of the Cinematronics shooter Star Castle. Though Atari execs decided the title was too complicated to bring over in the '80s, Williamson took it upon himself to make that transition possible. The result of some serious coding is 8K of ROM and 128 bytes of RAM's worth of good ol' space war. But he didn't stop there -- he redesigned the cartridge with a transparent casing and LEDs that flash during gameplay. Click through to the source link for the full step-by-step.