Digital Electronics
Most of the digital computers do not have floating point hardware because

Floating point hardware is costly
Of no specific reason
It is slower than software
It is not possible to perform floating point addition by hardware

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Digital Electronics
Positive logic in a logic circuit is one in which

logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 voltage level is lower than logic 1 voltage level.
logic 0 and, -1 are represented by negative and positive voltages respectively
logic 0 voltage level is higher than logic 1 voltage level

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