Depending on the form factor of the motherboard and case, around one to seven expansion cards can be added to a computer system.
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Some single-board computers made no provision for expansion cards, and may only have provided IC sockets on the board for limited changes or customization.IBM PC and descendants edit IBM introduced what would retroactively be called the Industry Standard Architecture (ISA) bus with the IBM PC in 1981.7 Daughterboards often have plugs, sockets, pins or other attachments for other boards.Other families edit Most other computer lines, including those from Apple Inc.The PCI bus was introduced in 1991 as a replacement for ISA.For their 1000 EX and 1000 HX models, Tandy Computer designed the plus expansion interface, an adaptation of the XT-bus supporting cards of a smaller form factor.At that time, the technology was called the PC bus.Examples of daughterboard-style expansion cards include: Enhanced Graphics Adapter piggyback board, adds memory beyond 64 KB, up to 256 KB 10 Expanded memory piggyback board, adds additional memory to some EMS and eems boards 11 ADD daughterboard raid daughterboard Network interface controller (NIC) daughterboard CPU.
8-bit ISA or XT-ISA a passive adapter can be made to connect XT cards to a plus expansion connector.The IBM XT, introduced in 1983, used the same bus (with slight exception).Daughterboard edit A sound card with a midi daughterboard attached A daughterboard for Inventec server platform that acts as a raid controller based on LSI 1078 chipset A daughterboard, daughtercard, mezzanine board or piggyback board is an expansion card that attaches to a system directly.The original ExpressCard standard acts like it is either a USB.0 peripheral or a PCI Express.x x1 device.2714470, Registered office: Gaugemaster House, Ford Road, arundel, West Sussex, BN18 0BN, United Kingdom.They establish the electrical contact between negotiable certificate of deposit definition finance the electronics on the card and on the motherboard.An expansion bus is a computer bus which moves information between the internal hardware of a computer system (including the.

Eisa, the 32-bit extended version of ISA championed by Compaq, was used on some PC motherboards until 1997, when Microsoft declared it a "legacy" subsystem in the PC 97 industry white-paper.
Expansion cards allowed a processor system to be adapted to the needs of the user, allowing variations in the type of devices connected, additions to memory, or optional features to the central processor (such as a floating point unit ).
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