Bytesize Micro Technology

Seattle, WA 98111

Also known as Bytesize Computer Products. In 1984, they changed their name to Omnitronix.


The Z-DUBBER is an interface between the Sinclair computer and its cassette recorder which allowed even the most difficult cassette program to load more easily. Additionally, the Z-DUBBER allowed you to connect two cassette recorders to create perfect backup copies of your programs. The Z-DUBBER operated on two AAA cells.
ZX80 ZX81 TS 1000 TS 2068


  • Hardware News: Z-Dubber
    Bytesize Computer Products introduces the Z-Dubber, an interface between the Timex/Sinclair 1000 or Sinclair ZX81 and its cassette recorder that allows you to load cassette programs easily. The Z-Dubber also permits users to connect two cassette recorders to create backup copies.
  • Improving Timex/Sinclair Tape Loading
    Reduce troublesome dropouts and noise problems with a Z-Dubber. Schematic and PCB layout for the Z-Dubber is provided.
  • Load Bettair Weeth Z-Dubber
    Product mention of the Z-Dubber from Bytesize Computer Products.
  • New Products and Services (Syntax v4 n1)
    New products from KSOFT, D. Lipinksi, ZX Software Team, M.C. Hoffman, Run-it Software Club, Startext, Expense Cutters Products, Computa-Dek, Bytesize Computer Products, Computer Continuum, Martin Irons, Rose Aircraft. Charles Durang will not publish ZX Newsletter, focus on books instead.
  • Recorder Interface for Sinclair/Timex
    Product announcement for Z-DUBBER from Bytesize Computer Products.
  • Resources (Sync v3 n2)
    Listing of new user groups, books and other resources.



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