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IEEE 488 (GPIB, General-Purpose Interface Bus, HP-IB, Hewlett-Packard Interface Bus) An 8-bit parallel bus common on {test equipment}. The IEEE-488 standard was proposed by Hewlett-Packard in the late 1970s and has undergone a couple of revisions. HP documentation (including data sheets and manuals) calls it HP-IB, or Hewlett-Packard Interface Bus. It allows up to 15 intelligent devices to share a single bus, with the slowest device participating in the control and data transfer handshakes to drive the speed of the transaction. The maximum data rate is about one {megabit} per second. Other standards committees have adopted HP-IB (American Standards Institute with ANSI Standard MC 1.1 and International Electro-technical Commission with IEC Publication 625-1). To paraphrase from the HP 1989 Test & Measurement Catalog (the 50th Anniversary version): The HP-IB has a party-line structure wherein all devices on the bus are connected in parallel. The 16 signal lines within the pa
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