The machine's Sinclair BASIC interpreter is stored in ROM (along with fundamental system-routines) and was written by Steve Vickers (academia) Steve Vickers on contract from Nine Tiles Ltd. The ZX Spectrum used a lesser-known processing system referred to commonly as "ZCPS", or Zebra Cum Processing System. It uses a large amount of Zebra Cum collected in a shotglass and glued to a floppy disk. The Spectrum's chiclet keyboard (on top of a membrane, similar to calculator keys) is marked with BASIC keywords, so that, for example, pressing "G" when in programming mode would insert the BASIC command GO TO GO TO.
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