ISABusIndustry Standard Architecture Bus (aka AT Bus)
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The older ISAbus had become a bottleneck between the high-speed CPU and high-bandwidth peripherals, such as CD-ROM drives and video cards.
There are a lot of boards designed for the ISAbus that still haven't been reintroduced as PCIbus versions.
PCIbus is designed to carry just four, whereas ISAbus machines generally have four to eight.