Sinclair

Now let's look at another early microcomputer, Sinclair systems

Sinclair ZX81

I have a chance to use this microcomputer through a good friend of mine. This is the first pocket microcomputer. Although not quite palm-size, it is easily portable although you would have to carry along a lot of other attachments. This is the ancestor of all palm-size microcomputers. Not forgetting, this is this the first PC which attempts to sell at a low price.

There were other microcomputers of similar size that came after the Sinclair ZX81 but like the Sinclair, all of them vanish into history. Pity

Specifications of the Sinclair ZX81 was as follows:

  • CPU - Z80A running at 3.25MHz.
  • RAM Memory of 16K, 32K or 64K.
  • VDU - monochrome, 24 x 32, can be connected to a TV
  • this system was not meant for graphical display
  • Input-Output - cassette
  • Diskette capacity - none

    Sinclair ZX Spectrum

    Specifications of the Sinclair ZX Spectrum was as follows:

  • CPU - Z80A running at 3.25MHz.
  • RAM Memory of 16K, 32K or 64K.
  • VDU - designed with colour and graphics in mind, can be attached to TV
  • Input-Output - cassette
  • Diskette capacity - none

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