Non User
Index: > A B C D E F G H I J K L M N O P Q R S T U V W X Y Z	Business Non User Industries Finance Tax

Home > Intel 80386

The processor was a significant evolution in a long line of processors that stretched back to the Intel 8008. The predecessor of the 80386 was the Intel 80286, a 16-bit processor with a segment-based memory management and protection system. The 80386 added a 32-bit architecture and a paging translation unit, which made it much easier to implement operating systems which used virtual memoryVirtual memory is a computer design feature that permits software to use more memory than the computer physically possesses. In technical terms, it allows software to run in a memory address space whose size and addressing are not necessarily tied to the.

Intel later introduced the 80486The Intel 80486 i486 486 is a range of Intel CISC microprocessors which is part of the Intel x86 family of processors. From a software point of view, the instruction set of the 486 family is very similar to its immediate predecessor, the Intel 80386, with, but neither it nor its successors under the PentiumThe Pentium is a fifth-generation x86 architecture microprocessor by Intel which first shipped on March 22, 1993. It is the successor to the 486 line. The Pentium was originally to be named 80586 or i586, but the name was changed to Pentium because number name were as big a step for Intel as the 32-bit flat addressing made possible by the 80386 (other microprocessor architectures, such as the Motorola 68000The Motorola 68000 is a CISC microprocessor, the first member of a successful family of microprocessors from Motorola, which were all mostly software compatible. The entire series was often referred to as the m68k or simply 68k History Originally, the MC6, had long since supported this form of addressing). Most applications running on Intel-based personal computers in 20032003 is a common year starting on Wednesday (link will take you to calendar), and also: The International Year of Freshwater The European Disability Year Summary Perhaps the defining global event of the year 2003 was the Invasion of Iraq launched by the U will run on the older 80386, albeit slowly; there were relatively few instructions added to the main instruction set in later generations, and in most cases their usage can be avoided. Building a program for the 80286 was often much harder.

Late in the 80386’s production run, Intel introduced the 80386SX, which was meant to be a low cost version of the i386. The SX series of chips was 32 bits internally, but had a 16 bit external bus (in much the same way that the 8088 in the original IBM PC was a lower cost version of the 8086). The original 80386 was subsequently renamed the 80386DX to avoid confusion. Also, due to this new 16 bit bus, Intel released a version of the 80386 called SX Now! which was pin-compatible with the 80286. This enabled many 80286 owners to upgrade to the 80386 without buying a new motherboard.

Because of the high degree of compatibility, the range of processors compatible with the 80386 is often collectively termed the i386 architecture; the instruction set for the architecture is now known as IA-32IA-32 sometimes generically called x86 or even x86-32. Within various programming language directives it is also referred to as " i386"; this directive would inform the compiler to generate code only for the IA-32 instruction set. It is the instruction se or, informally, i386.

From a business perspective, the i386 was significant because it was the first significant microprocessor to be single-sourced – i.e., it was available only from Intel Corp. Prior to this, the difficulty of making chips and the uncertainty of reliable supply required that any mass-market semiconductor be multi-sourced , that is, made by two or more manufacturers, the second and subsequent ones manufacturing under license from the designer. Single-sourcing the i386 allowed Intel greater control over its development and substantially greater profits in later years. However, AMD introduced its compatible Am386 processor in March 1991 after overcoming legal obstacles, thus breaking Intel’s monopoly.

Politics	Business	Finance

Topics: Intel 80386 I386 Processor 80286 Version Microprocessor Cost...

---