Along with these came dramatic speed improvements which were a result of improved electronics and more complex circuitry. The IBM 7094 included an Instruction Backup Register. When the control unit fetched 2 storage locations from memory, it stored 1 in the Instruction Backup Register so the control unit only had to make half the calls to main memory, resulting in reducing the average instruction cycle time.
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The introduction of data channels was quite significant. They are independent I/O modules and contain their own processor and instruction set allowing these modules to take care of the I/O instructions, resulting in relieving the CPU of considerable processing burden.
The multiplexer acts as a central termination point for the data channels, the CPU and memory. Scheduling access to each of these devices, it allows them to act independently of each other.
