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Early computers took up the space of a room.
Minicomputers generally fit into one or a few refrigerator sized racks.
It was not until the 1970s when computers such as the HP 9800 series desktop computers were fully programmable computers that fit entirely on top of a desk.
The very first large " programmable calculators / computers " ( machines lacking keyboards for text input ) were marketed in the second half of the 1960s, starting with Programma 101 ( 1965 ) and HP 9100 ( 1968 ).
More desktop models were introduced in 1971, leading to a model programmable in BASIC in 1972.
They used a smaller version of a minicomputer design based on ROM memory and had small one-line LED alphanumeric displays.
They could draw computer graphics with a plotter.
The Wang 2200 of 1973 ked operating systems such as Mac ( Macintosh ) and Windows.
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