Chopper X Lands on Commodore Amiga in Remarkable Atari ST Conversion Using Original Game Code

Developer MrDig converts 1988 Atari ST helicopter shooter Chopper X to Commodore Amiga 500, adapting original 68000 code for the Amiga Blitter and Paula.

A forgotten Atari ST helicopter shooter has unexpectedly arrived on the Commodore Amiga, thanks to a technically unusual conversion by developer MrDig. Chopper X version 0.93 was published on October 17 and preserves much of the original Atari ST program rather than recreating the game from scratch.

Originally released in 1988, Chopper X follows the familiar arcade formula of piloting a military helicopter through vertically scrolling battlefields filled with enemy aircraft, tanks, boats and defensive installations. Players must survive eight stages while managing ammunition and collecting additional bombs. The conversion is particularly interesting because the Atari ST and Amiga both use Motorola 68000 processors.

MrDig disassembled the original program and modified approximately thirty areas responsible for communication with Atari-specific hardware. The Amiga's Blitter now converts graphics into the required display format, while its Copper assists with screen presentation. Sound originally produced through the Atari ST's YM2149 chip has been adapted for the Amiga's Paula hardware. The developer has preserved the original game's timing rather than artificially increasing its speed. Several conveniences have been added, including alternative controls, optional cheats and high-score saving.

The release is available as a bootable floppy image, hard-drive installation and WHDLoad package. A standard Amiga 500 with 1MB of memory is sufficient for the floppy version, and compatibility has been tested on real Amiga hardware. MrDig openly acknowledges using AI-assisted development tools while personally directing and testing the conversion. Chopper X may not be remembered as a masterpiece, but its revival demonstrates how technically interesting even modest vintage games can become. The old Atari-versus-Commodore rivalry has apparently ended with the two computers sharing a helicopter.