IBM PC Compatible

IBM PC compatible computers are those generally similar to the original IBM PC, XT, and AT. Such computers used to be referred to as PC clones, or IBM clones. They duplicated almost exactly all the significant features of the PC architecture, facilitated by various manufacturers' ability to reverse engineer the BIOS using a "clean room design" technique. Columbia Data Products built the first clone of the IBM personal computer by a clean room implementation of its BIOS.

Many early IBM PC compatibles used the same computer bus as the original PC and AT models. The IBM AT compatible bus was later named the Industry Standard Architecture bus by manufacturers of compatible computers. The term "IBM PC compatible" is now a historical description only, since IBM has ended its personal computer sales.

Descendants of the IBM PC compatibles comprise the majority of personal computers on the market presently, although interoperability with the bus structure and peripherals of the original PC architecture may be limited or non-existent.

Read more about IBM PC CompatibleOrigins, Compatibility Issues, The Decreasing Influence of IBM, Expandability, "IBM PC Compatible" Becomes "Wintel", Design Limitations and More Compatibility Issues, Challenges To Wintel Domination, The IBM PC Compatible Today

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Influence Of The IBM PC On The Personal Computer Market - Systems Launched Shortly After The IBM PC - X86-based Systems (using OEM-specific Versions of MS-DOS)
... Early after the launch of the IBM PC in 1981, there were still dozens of systems that were not IBM PC-compatible, but did use Intel x86 chips ... an OEM version of MS-DOS (as opposed to the OEM version customized for IBM's use) ... they generally made no attempt to copy the IBM PC's architecture, so these machines had different I/O addresses, a different system bus, different video ...
FATX - Technical Design - Boot Sector
... the first 11 bytes used by most FAT versions for IBM compatible x86-machines since DOS 2.0 are Byte Offset Length (bytes) Description 0x000 3 Jump instruction ... For backward compatibility MS-DOS, PC DOS and DR-DOS also accept a jump (0x69 0x?? 0x??) on removable disks ... JMPS sequence starting with an NOP (0x90 0xEB 0x??), whereas MS-DOS/PC DOS do not ...
The IBM PC Compatible Today
... The term 'IBM PC compatible' is not commonly used presently because all current mainstream computers are based on the PC architecture, and IBM no longer makes PCs ... The processor speed and memory capacity of modern PCs are many orders of magnitude greater than they were for the original IBM PC and yet backwards compatibility has ...
Kinds of Boot Sectors
... Several major kinds of boot sectors could be encountered on IBM PC compatible hard disks, floppy disks and similar storage devices A Master Boot ... The presence of an IBM PC compatible boot loader for x86-CPUs in the boot sector is by convention indicated by a two-byte hexadecimal sequence 0x55, 0xAA (called the boot sector ... The signature is checked for by most System BIOSes since (at least) the IBM PC/AT (but not by the original IBM PC and some other machines) ...
Programmable Interval Timer - IBM PC Compatible
8253 PIT was the original timing device used on IBM PC compatibles ... access memory refreshes and timer 2 for the PC speaker ...

Famous quotes containing the word compatible:

    I have no ambition to surprise my reader. Castles with unknown passages are not compatible with my homely muse.
    Anthony Trollope (1815–1882)