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Ibm Rev 1.2 Motherboard User Manual

The 8088 motherboard was designed in 40 days,[22] with a working prototype created in four months,[23] demonstrated in January 1981. The design was essentially complete by April 1981, when it was handed off to the manufacturing team.[24] PCs were assembled in an IBM plant in Boca Raton, with components made at various IBM and third party factories. The monitor was an existing design from IBM Japan; the printer was manufactured by Epson.[25] Because none of the functional components were designed by IBM, they obtained no patents on the PC.[26]

Ibm Rev 1.2 Motherboard User Manual


Sales exceeded IBM's expectations by as much as 800%, with the company at one point shipping as many as 40,000 PCs per month.[40] IBM estimated that home users made up 50 to 70% of purchases from retail stores.[41] In 1983, IBM sold more than 750,000 machines,[42] while Digital Equipment Corporation, one of the companies whose success had spurred IBM to enter the market, sold only 69,000.[43]

The PC is built around a single large circuit board called a motherboard which carries the processor, built-in RAM, expansion slots, keyboard and cassette ports, and the various peripheral integrated circuits that connected and controlled the components of the machine.

The PC motherboard included a second, empty socket, described by IBM simply as an "auxiliary processor socket", although the most obvious use was the addition of an Intel 8087 math coprocessor, which improved floating-point math performance.[53]

From the factory the PC was equipped with either 16 KB or 64 KB of RAM. RAM upgrades were provided both by IBM and third parties as expansion cards, and could upgrade the machine to a maximum of 256 KB on the motherboard, and 640 KB total.[51]

The BIOS is the firmware of the IBM PC, occupying one 8 KB chip on the motherboard. It provides bootstrap code and a library of common functions that all software can use for many purposes, such as video output, keyboard input, disk access, interrupt handling, testing memory, and other functions. IBM shipped three versions of the BIOS throughout the PC's lifespan.

At release, IBM did not offer any hard disk drive option[51] and adding one was difficult - the PC's stock power supply had inadequate power to run a hard drive, the motherboard did not support BIOS expansion ROMs which was needed to support a hard drive controller, and both PC DOS and the BIOS had no support for hard disks. After the XT was released, IBM altered the design of the 5150 to add most of these capabilities, except for the upgraded power supply. At this point adding a hard drive was possible, but required the purchase of the IBM 5161 Expansion Unit, which contained a dedicated power supply and included a hard drive.[60]

The motherboard includes five 62-pin card edge connectors which are connected to the CPU's I/O lines. IBM referred to these as "I/O slots," but after the expansion of the PC clone industry they became retroactively known as the ISA bus. At the back of the machine is a metal panel, integrated into the steel chassis of the system unit, with a series of vertical slots lined up with each card slot.

This document tries to provide a starting point for those whowant to run FreeBSD on an Alpha-based machine. It is aimed atproviding background information on the various hardware designs.It is not a replacement for the systems manuals.

Using 8 SIMMs for a 256bit wide memory can yield interestingspeedups over a 4 SIMM/128bit wide memory. Obviously all 8 SIMMsmust be of the same type to make this work. The system must beexplicitly setup to use the 8 SIMM memory arrangement. You musthave 8 SIMMs, 4 SIMMs distributed over 2 banks will not work. Forthe AlphaPC164 you can have a maximum of 1Gbyte of RAM, using 8128Mbyte SIMMs. The manual indicates the maximum is 512 Mbyte.

Where possible, the drivers applicable to each device or classof devices is listed. If the driver in question has a manual pagein the FreeBSD base distribution (most should), it is referencedhere. Information on specific models of supported devices,controllers, etc. can be found in the manual pages.

Note: The device lists in this document are beinggenerated automatically from FreeBSD manual pages. This means thatsome devices, which are supported by multiple drivers, may appearmultiple times.

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language. 350c69d7ab


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