Zork was originally written in 1977 on a PDP-10, which had a ceiling of about one megabyte of memory; it was ported to microcomputers in three parts from 1980-1

Zork was originally written in 1977 on a PDP-10, which had a ceiling of about one megabyte of memory; it was ported to microcomputers in three parts from 1980-1982, and had to fit into about 48k of RAM and 85-170k of disc space. It is approximately forty-five years old. The curve has long since moved on.