TheHP Precision bus (also calledHP-PB andHP-NIO)[1]is the data transferbus of the proprietaryHewlett Packard architectureHP 3000 and later many variants of the HP 9000 series of UNIX systems. This bus has a 32-bit data path with an 8MHzclock. It supports a maximum transfer rate of 23MB/s inburst mode. That bus was also used to directly support the Programmable Serial Interface (PSI) cards, which offered multi-protocol support for networking, notablyIBM Bisync and similar systems.The 920, 922 and 932 series supported up to three PSI cards, and up to five cards in the 948 and 958 series.
Two form factors/sizes of HP-PB expansion cards were sold: single and double.[2]
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