How did the Famicom Disk Metroid differ from the NES version?
The first Metroid most of the world played is not the first one Nintendo made. Japan’s original is a Famicom Disk System game, written to a rewritable floppy. The 1987 NES cartridge that followed had to solve the same problems, saving, sound, endings, with different hardware, and the seams are exactly where the two versions part.
Metroid, two ways
The Disk System original sits on the left of this comparison in spirit: three save files written straight to the disk, like Zelda’s in Japan. The Famicom Disk hardware also gave it a wavetable sound channel the NES lacked, so its title theme, appearance fanfare, item fanfare and ending are richer than the simplified NES arrangements, and its escape countdown is a screeching siren where the NES whoops softly. In exchange, the disk loads between areas, and one thing is missing: there is no suitless Samus in the Disk version. A completed FDS file is marked with a money-bag icon. Samus out of the suit exists only because the password system does.