2. Gas pedals
In the remainder of this text, we'll use the terms coprocessor or gas pedal interchangeably. Co-processors have always been designed to reduce program execution times. There are four main types of co-processor.
2.1 Math and I/O coprocessors
Mainframes of the 1960s featured specialized coprocessors for input/output (I/O). The IBM-365 (1965) had "channel processors" for both slow and fast peripherals. The CDC 6600 (1964) had 10 peripheral I/O processors (figure 1 ). The peripheral processors used the fine-grained multithreading principle
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