and were first separately offered by Conner Peripherals as the CP342 in June 1987. The first such drives appeared internally in Compaq PCs in 1986. Together with Control Data Corporation (the hard drive manufacturer) and Compaq Computer (the initial customer), they developed the connector, the signaling protocols and so on, with the goal of remaining software compatible with the existing ST-506 hard drive interface. The first version of what is now called the ATA/ATAPI interface was developed by Western Digital under the name Integrated Drive Electronics (IDE). A single 2-drive ATA interface and a floppy interface was added to this system via the 16-bit ISA card. Such basic motherboards could have been outfitted with either the ST-506 or ATA interface, but usually not both. They were replaced by SATA interfaces.Įxample of a 1992 80386 PC motherboard with nothing built in other than memory, keyboard, processor, cache, realtime clock, and slots. Called the "primary" and "secondary" ATA interfaces, they were assigned to base addresses 0x1F0 and 0x170 on ISA bus systems. Physical ATA interfaces became a standard component in all PCs, initially on host bus adapters, sometimes on a sound card but ultimately as two physical interfaces embedded in a Southbridge chip on a motherboard. When a newer Serial ATA (SATA) was introduced in 2003, the original ATA was renamed to Parallel ATA, or PATA for short. The "AT" in the IBM PC/AT referred to "Advanced Technology" so ATA has also been referred to as "Advanced Technology Attachment". The original ATA specifications published by the standards committees use the name "AT Attachment". The standard was originally conceived as the "AT Bus Attachment," officially called "AT Attachment" and abbreviated "ATA" because its primary feature was a direct connection to the 16-bit ISA bus introduced with the IBM PC/AT. 5.1 ATAPI Removable Media Device (ARMD).5 Related standards, features, and proposals.4.1 Features introduced with each ATA revision.4 ATA standards versions, transfer rates, and features.2.6 Two devices on one cable-speed impact.2.5 Serialized, overlapped, and queued operations.It has largely been replaced by SATA in newer systems. For many years, ATA provided the most common and the least expensive interface for this application. Because of this limit, the technology normally appears as an internal computer storage interface. Parallel ATA cables have a maximum allowable length of 18 in (457 mm). After the introduction of Serial ATA (SATA) in 2003, the original ATA was renamed to Parallel ATA, or PATA for short. As a result, many near-synonyms for ATA/ATAPI and its previous incarnations are still in common informal use, in particular Extended IDE ( EIDE) and Ultra ATA ( UATA). The ATA interface itself evolved in several stages from Western Digital's original Integrated Drive Electronics ( IDE) interface. The Parallel ATA standard is the result of a long history of incremental technical development, which began with the original AT Attachment interface, developed for use in early PC AT equipment. It uses the underlying AT Attachment ( ATA) and AT Attachment Packet Interface ( ATAPI) standards. The standard is maintained by the X3/ INCITS committee. The connection is used for storage devices such as hard disk drives, floppy disk drives, and optical disc drives in computers. It was first developed by Western Digital and Compaq in 1986 for compatible hard drives and CD or DVD drives. Parallel ATA ( PATA), originally AT Attachment, also known as ATA or IDE is standard interface for IBM computers. Two ATA motherboard sockets on the left, with an ATA connector on the right.
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