It was ported to the Oric by Lars Lundgren in 1983.
It was ported to the ZX-81 by Kevin Bevan and published as 'Timeslide' (one word) in Sinclair Programs, issue 16, February 1984, pp. 34–37.
Three versions of the game (two under the title Time Switch and one as Time Zone) were later created by R. D. Foord Software for the ZX Spectrum and feature location graphics. These versions are credited to R. D. Foord and seem to date from 1985. Time Zone appears to be the 'final version' of the game, as it has expanded text and a "faster" graphics engine. It's unclear if the R. D. Foord games were commercially released.
R. D. Foord also used the ZX81 version of the game as the basis for a demonstration adventure that he included in his GFA BASIC 2-powered Atari ST Adventure Writing System (ST_AWS).
The original game was ported to the BBC/Electron by Jon Ripley in 1989.
Jim Gerrie has created a version of the game for the TRS-80 MC-10.
In 2016, the game was ported to the NewBrain; see here for details.
[+] Users currently playing this game
The programming of the BBC version is poor - if you type INVENTORY it responds "I CAN'T INVENTORY THE "!