History of PCI Security

History of PCI
The original PC bus in the original IBM PC that was created around the year 1982 is 16 bits wide and operated at 4.77 MHz. Formally known as the ISA bus. Bus design is capable of passing along data at speeds of up to 9 MBps (megabytes per second) or more, high quality, fast enough for many applications even today.

Several decades ago, the ISA bus is still used on many computers in the world. Bus accepted computer cards developed for the original IBM PC in the early 1980s. ISA bus remained in use even after more advanced technology is made available to replace it.

There are some key tips for longevity:

    Long-term compatibility with a large number of hardware manufacturers.
    Before the rise of multimedia, few hardware peripherals fully utilize the newer bus speeds.

As technology advanced and the ISA bus failed to compete with other buses were developed. Key among the Extended Industry Standard Architecture (EISA) - which is 32 bits at 8 MHz - and Vesa Local Bus (VL-Bus).
Interestingly, there is the VL-Bus (VESA = Video Electronics Standards Association ) is that it is 32 bits wide and operated by local bus speed, which is usually the speed of the processor itself.

VL-Bus essentially tied directly into the CPU. This works fine for a single device, or maybe even two CPUs. But connecting more than two devices to the VL-Bus introduced the possibility of interference with the CPU performance because of the burden so heavy.

Therefore, the VL-Bus was typically only used to connect the graphics card, the component that actually benefit from high-speed access to the CPU.

In early 1990, Intel introduced a new bus standard for consideration, the Peripheral Component Interconnect (PCI) bus. PCI presents a sort of hybrid between the ISA and VL-Bus. It provides direct access to system memory for connected devices, but uses a bridge to connect to the frontside bus and therefore to the CPU.

Basically, the new technology is capable of higher performance than VL-Bus while eliminating the potential for interference with the CPU. Description: History of PCI Security Rating: 4.5 Reviewer: Unknown ItemReviewed: History of PCI Security

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