➀ Developer Jonas Eschenburg successfully ported the iconic FPS 'Doom' to the 40-year-old Atari ST, utilizing 16 colors and heavy dithering for visual output.
➁ The port retains gameplay features like palette effects (e.g., red screen flashes when taking damage) and requires original Doom files or a shareware demo to run.
➂ Compilation is limited to Linux systems due to copyright restrictions on the DOS sound library, highlighting technical and legal challenges in retro porting.