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DCP INTERSPEC instruction manual by DCP Microdevelopments Limited. 8 pages.
The DCP INTERSPEC is a interface to provide switchable outputs and switch inputs to a ZX81 or ZX Spectrum.
DCP Microdevelopments Limited, 1982

Donated/on loan from: Anonymous

Scanned/edited copy of instruction manual (with thanks to Charles Large)

DCP INTERSPEC instruction manual