Your time machine has crashed in the dim and distant past. To return to your own time you must repair your machine.
Notes
This was originally published for the Spectrum ZX by IPC Business Press as a BASIC type-in listing in Your Computer, vol. 3, no. 8, August 1983, pp. 64–65. The article title is titled 'Time Sliders', but the adventure is titled 'The Time Switch'. Versions 2 and 3 were later published by R. D. Foord Software with basic graphics. It was unofficially ported to the Oric by Lars Lundgren in 1983 and to the BBC/Electron by Jon Ripley in 1989.
The programming of the BBC version is poor - if you type INVENTORY it responds "I CAN'T INVENTORY THE "!