YS MegaBasic

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YS MegaBasic
Developer(s) Mike Leaman
Stable release
YSMegaBasicV4.0 / 1985; 31 years ago (1985)
Operating system ZX Spectrum
Type BASIC programming language interpreter
License Proprietary

YS MegaBasic was a BASIC programming language interpreter for the 1982 Sinclair Research ZX Spectrum microcomputer, written by Mike Leaman.[1][2]

When loaded it left the user 22K of usable memory. YS MegaBasic allowed keywords to be spelled out letter-for-letter, which was quicker if the user had fitted a full-size full-travel keyboard to their machine, a very popular modification for serious users. This also removed the necessity for memorising the sometimes arcane key combinations necessary to enter less-commonly-used BASIC keywords. It also featured three different font sizes, user definable keys, copy-and-paste, a Sinclair QL-like windowing system, sprites and sound effects.[1]


  • YSMegaBasic V1.0 - 1984
  • YSMegaBasic V1.1 - 1984
  • YSMegaBasic V1.1 Sprite Designer - 1984
  • YSMegaBasic V3.0 - 1985
  • YSMegaBasic V4.0 - 1985