What is Locomotive BASIC?

Locomotive Basic is a proprietary dialect of the BASIC programming language written by Locomotive Software on the Amstrad CPC and the later Locomotive BASIC-2 as a GEM application on the Amstrad PC1512 and 1640. It was the main descendant of Mallard BASIC, the interpreter for CP/M supplied with the Amstrad PCW.

There are two versions of Locomotive BASIC: 1.0 which only came with the CPC model 464, and 1.1 which shipped with all other versions. BASIC 1.1 was also shipped with the Amstrad CPC Plus series machines, as part of the included game cartridge.