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We Owe A Debt To Early Computer Bus Development
By Maxwell Rubin
Why was there such a rush in the development of the vintage computer bus?
All in all there were a number of ongoing improvements. These included. 32 bit widths. Bus mastering. Less susceptible to noise in that they were “quieter’ in signal transmission. More convenience of setup of add on boards via software.
The ISA bus came in only 8 bit and 16 bit formats. Whereas the later 386 and 486 chips , in both the DX and SX formats while they did have a 32 bit path were hobbled by the ISA bus. As a result they could never realize their true 32 bit speed potential. Later buses such as the MCA and EISA busses were able to overcome these inherent limitations.
Thee “data highways” referred to as “: busses” are the data transmission lines around the PCs. The bus serves as the path for information transmission around the PC. True this routing is controlled by the CPU. However as that point in vintage computing history this was not an issue. The PCs were stand alone single CPU units.
However as time went on and PCs got faster and more complicated with less expensive additional CPUs handling other tasks within the PCs events became dicer.Onboard peripherals themselves began to have built in CPUs. CPUS in different manners began to be found in such peripherals as hard drives, sound and video cards.
The overall computer system may become much more efficient if these in essence peripheral CPUs can communicate directly with each other. without having to use the main CPU as an intermediary. Hence MCA and EISA were developed with these roles in mind. The concept became known as “bus mastering”.
Bus mastering involves the concept that the peripheral CPUS could request permission to take over the bus for a short period of time. The main CPU would
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