Sinclair ZX81

Abacus Programs
Addictive Software
Amsoft
Artic Computing
AVC Software
Axis
Bug-Byte
Campbell Systems
Carnell Software
Cascade
CDS Software
Collins Computing
Digital Integration
DK'tronics
ICL
ICL
J.K. Greye Enterprises
JRS Software
Leisure Genius
Llamasoft
Lothlorien
Macronics
Micro-Gen
Micromega
Miscellaneous
New Generation Software
No Man's Land
Peaksoft
Phipps Associates
Picturesque
Psion
PSS
PSS
Quicksilva
Rose Software
Scisoft
Silicon Tricks
Sinclair
Sinclair User Club
Software Farm
WH Smith
Woodside Software

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