Progress Slot ESIA, ISA and PCI

A computer can not be separated from the motherboard, other than a place to install the processor and memory, there are also other places such as installing card VGA Card, Sound Card, Modem Card, Lan Card, etc..

In its development, computers have evolved, as well as for the slot VGA, had been developed from the EISA slots using Mono chrome VGA card, and then developed with a color VGA ISA slot, VGA and continue to grow apart from the ISA slot into Slot AGP 2x, 4x to AGP 8x, and had been developed until now known as PCI-Express slot for VGA card.

For others like Sound card, Lan Card, to model today's motherboards are already using Onboard facilities, even to the vga also onboard. So the smaller the motherboard because the slot ESIA was not there and only has as many as 2 ISA slots.

To know the development of card slots on the computer let's try to discuss it:


Bus EISA (Extended / Enhanced Industry Standard Architecture) is a bus I / O, introduced in September 1988 as a response from the launch of IBM's MCA bus, considering that IBM wanted to "monopolize" the bus MCA to require other parties to pay royalties to license the MCA. This standard was developed by several vendors IBM PC Compatible, in addition to IBM, although that greatly contributed to the Compaq Computer Corporation. Compaq EISA, too, who form the Committee, a nonprofit organization designed specifically to manage the development of the EISA bus. In addition to Compaq, there are several other companies that develop EISA which if sorted, then the collection company can be called as WATCHZONE:

    * Wyse
    * AT & T
    * Tandy Corporation
    * Compaq Computer Corporation
    * Hewlett-Packard
    * Zenith
    * Olivetti
    * NEC
    * Epson

Although offering significant development in comparison with 16-bit ISA, EISA-based cards only a few on the market (or developed). That was just a hard disk array controller card (SCSI / RAID) cards and network servers.

EISA bus is basically a 32-bit versions of ordinary ISA bus. Not as MCA from IBM is really new (architecture and design of their slots), users can still use ISA cards 8-bit or 16-bit long into the EISA slots, so this has added value: backward compatibility (backward compatibility .) As with the MCA bus, EISA EISA cards also allow configuration automatically using the software, so that it can be said EISA and MCA are the pioneers of "plug-and-play", although still primitive.


Bus ISA (Industry Standard Architecture) is a bus architecture with the data bus width of 8-bit IBM PC was introduced in 5150 on August 12, 1981. ISA bus is updated by adding the data bus width to 16-bit on IBM PC / AT in 1984, so the ISA bus type in circulation was divided into two parts, namely the ISA 16-bit and 8-bit ISA. ISA is the basic and most common bus used in IBM PC until 1995, before finally being replaced by PCI bus, which was launched in 1992.

8-bit ISA

8-bit ISA bus is a variant of the ISA bus, the bus width of 8-bit data, used in IBM PC 5150 (initial PC model). This bus had been abandoned in modern systems to top, but Intel 286/386 systems still have it. This bus speed is 4.77 MHz (same as Intel 8088 processor in the IBM PC), before it was increased to 8:33 MHz on an IBM PC / AT. Because it has a bandwidth of 8-bit, then it has a maximum transfer rate is only 4.77 MByte / sec or 8:33 MByte / sec. Despite having a slow transfer rate, this bus including sufficient time, because the buses I / O such a serial port, parallel port, floppy disk controller, keyboard controller and the other very slow. This slot has 62 connectors.

Although a simple design, IBM did not immediately publish the specifications when it launched in 1981, but had to wait until 1987, so that the support device manufacturers struggling to make the device somewhat 8-bit ISA-based.

16-bit ISA

16-bit ISA bus is an ISA bus has a bandwidth of 16-bit, thus allowing the transfer rate is two times faster than the 8-bit ISA at the same pace. This bus was introduced in 1984, when IBM released the IBM PC / AT with Intel 80286 microprocessor in it. Why IBM improve to 16-bit ISA is because the Intel 80286 has a data bus which has a width of 16-bit, so that communication between processors, memory, and motherboard should be done in 16-bit ordinal. Although this processor can be installed on the motherboard that has a bus I / O with 8-bit bandwidth, this can lead to bottlenecks on the system bus concerned.

Instead of creating a bus I / O is a new, IBM was just a little break from design ISA 8-bit long, ie, by adding a connector 16-bit extensions (which add 36 connectors, so to 98 connector), which was first launched in August In 1984, the same year when IBM PC / AT was released. This is also the reason why the ISA 16-bit is called the AT-bus. This is indeed create interference with some 8-bit ISA cards, so IBM had to leave this design, to a design in which two slots are combined into one slot.


PCI (an extension of the English language: Peripheral Component Interconnect) bus which is designed to handle some hardware. PCI bus standard was developed by the PCI Special Interest Group consortium formed by the Intel Corporation and several other companies, in 1992. The purpose of this bus is to replace the bus ISA / EISA computers previously used in its IBM PC or compatible.

Old computer using ISA slot, which is a slow bus. Since its emergence around 1992, the PCI bus is still used today, to exit the latest version of PCI Express (add-on).

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