IBM introduced these on the IBM 709 in 1958, and they became a common feature of their platforms.
This was implemented in the Unibus of the PDP-11 around 1969. Early microcomputer bus systems were essentially a passive backplane connected directly or through buffer amplifiers to the pins of the CPU.
But through the 1980s and 1990s, new systems like SCSI and IDE were introduced to serve this need, leaving most slots in modern systems empty.
But through the 1980s and 1990s, new systems like SCSI and IDE were introduced to serve this need, leaving most slots in modern systems empty.
Today there are likely to be about five different buses in the typical machine, supporting various devices. ===Third generation=== "Third generation" buses have been emerging into the market since about 2001, including HyperTransport and InfiniBand.
By 2004 AGP was outgrown again by high-end video cards and other peripherals and has been replaced by the new PCI Express bus. An increasing number of external devices started employing their own bus systems as well.
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