Mallard BASIC is a BASIC interpreter for CP/M written by Locomotive Software and supplied with the Amstrad PCW range of small business computers, the ZX Spectrum +3 version of CP/M Plus, and the Acorn BBC Micro Z80 second Processor. Mallard was more like a traditional micro ROM BASIC, with an integrated editor which was tailored for the PCW's non-standard 90-column screen. Graphics could be implemented by loading the GSX extension to CP/M, but this was cumbersome for BASIC programmers.