Dimensions : Width=167mm (6.32in), depth=175mm (6.80in), height=40mm (1.57in), weight 350 gms (12.15oz)
March 1981, Sinclair unveils the ZX81, based on the Z80A microprocessor, for under US$200.
Oct. 1981, The ZX81 is introduced to the American market, for US$150.
September 1981, Sinclair Research and W H Smith sign an agreement for W H Smith to sell the ZX-81 in its retail stores in England, for a trial 1-year period.
Jan. 1981, In the first 10 months of sale, 250,000 Sinclair ZX81 microcomputers have been delivered.
In may 1982, Timex Computer Corp. and Sinclair Research Ltd. announce
an agreement for Timex to market a 2KB version of the ZX-81 as the Timex/Sinclair