Datasheet[edit]. DX2 Microprocessor Data Book (February ) · Intel DX2 Microprocessor Data Book (July ) · DX. The exposed die of an Intel DX2 microprocessor The Intel (“four- eighty-six”), also known as the i or is a higher .. Intel datasheets. The Intel , also known as the i or , is a higher performance follow- up to the Intel .. Intel datasheets · Low power SX and DX with variable freq.

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The Intelalso known as the i oris a higher performance follow-up to the Intel microprocessor. The was introduced in and was the first tightly [a] pipelined x86 design as well as the first x86 chip to use more than a million transistors, due to a large on-chip cache and an integrated floating-point unit.

It represents a fourth generation of binary compatible CPUs since the original of The i does not have the usual prefix because of a court ruling that prohibits trademarking numbers such as Later, with the introduction of the Pentium brand, Intel began branding its chips with words rather than numbers. The was announced at Spring Comdex in April At the announcement, Intel stated that samples would be available in the third quarter of and production quantities would ship in the fourth quarter of The instruction set of the i is very similar to its predecessor, the Intelwith the addition of only a few extra instructions, such as CMPXCHG which implements a compare-and-swap atomic operation and XADD, a fetch-and-add atomic operation returning the original value unlike a standard ADD which returns flags only.

From a performance point of view, the architecture of the i inyel a vast improvement over the It has an on-chip unified instruction and data cachean on-chip floating-point unit FPU and an enhanced bus interface unit. Due to the tight pipelining, sequences of simple instructions such as ALU reg,reg and ALU reg,im could sustain a single dstasheet cycle throughput one instruction completed every clock.

These improvements yielded a rough doubling in integer ALU performance over the at the same clock rate. Virtual addresses were then normally mapped onto physical addresses by the paging system except when it was disabled.

intel :: 80486 :: i486 Microprocessor Data Sheet Apr89

Real mode had no virtual addresses. Just as with thecircumventing memory segmentation could substantially improve performance in some operating systems and applications. The address bus used bits A However, problems continued when the DX was installed in local-bus systems due to the high bus speed, making it rather unpopular with mainstream consumers, as local-bus video was considered a requirement at the time, though it remained popular with users of EISA systems.


More powerful iterations such as the OverDrive and DX4 were less popular the latter available as an OEM part onlyas they came out after Intel had released the next-generation P5 Pentium processor family. Some were clones identical at the microarchitectural levelothers were clean room implementations of the Intel instruction-set.

IBM’s multiple source requirement is one of the reasons behind its xmanufacturing since the Intel and IBM have broad cross-licenses of these patents, and AMD was granted rights to the relevant patents in the settlement of a lawsuit between the companies.

Cyrix made a variety of compatible processors, positioned at the cost-sensitive desktop and low-power laptop markets. Unlike AMD’s clones, the Cyrix processors were the result of clean-room reverse-engineering. The Motorolawhile not compatible with thewas often positioned as the ‘s equivalent in features and performance.

Clock-for-clock basis the Motorola could significantly outperform the Intel chip. The Motorola performance lagged behind the later production systems. Especially older peripheral cards normally worked well at such speeds as they often used standard MSI chips instead of slower at the time custom VLSI designs.

This could give significant performance gains such as for old video cards moved from a or computer, for example. EISA offered a number of attractive features such as increased bandwidth, extended addressing, IRQ sharing, and card configuration through software rather than through jumpers, DIP switches, etc.

However, EISA cards were expensive and therefore mostly employed in servers and workstations. The VL-Bus operated at the same clock speed as the ibus basically being a local bus while the PCI bus also usually depended on the i clock but sometimes had a divider setting available via the BIOS. Even overseas in the United States it was popularised as “The World’s First ” in the September issue of Byte magazine shown right.

Later boards also supported Plug-And-Playa specification designed by Microsoft that began as a part of Windows 95 to make component installation easier for consumers. The introduction of 3D computer graphics spelled the end of the ‘s reign, because 3D graphics make heavy use of floating-point calculations and require a faster CPU cache and more memory bandwidth.

Developers began to target the P5 Pentium processor family almost exclusively with x86 assembly language optimizations e. Many of these games required the speed of the P5 Pentium processor family’s double-pipelined architecture. In the general-purpose desktop computer role, based machines remained in use into the early s, especially as Windows 95, Windows 98, and Windows NT 4.

Still, a number of machines have remained in use today, mostly for backward compatibility with older programs most notably gamesespecially since many of them have problems running on newer operating systems. However, DOSBox is also available for current operating systems and provides emulation of the instruction set, as well as full compatibility with most DOS-based programs.


Although the was eventually overtaken by the Pentium for personal computer applications, Intel had continued production for use in embedded systems.

In May Intel announced that production of the would stop at the end of September This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November and incorporated under the “relicensing” terms of the GFDLversion 1.

From Wikipedia, the free encyclopedia. Intel The exposed die of an Intel DX2 microprocessor. This section possibly contains original research.

Please improve it by verifying the claims made and adding inline citations. Statements consisting only of original research should be removed.

September Learn datashfet and when to remove this template message. In contrast loosely pipelined implies that some kind of buffering is used to decouple the units and allow them to work more independently.

Both the original and the xchips of today are “loosely pipelined” in this sense, while the and the original Pentium worked in a “tightly pipelined” manner for typical instructions. Also, leaving off the bit extension to the ISA connector allowed use of some early 8-bit ISA cards that otherwise could not be used due to the PCB “skirt” hanging down into that bit extension space.

The New York Times. Retrieved May 5, The Intel vs. Retrieved May 20, Archived from the original on December 5, Retrieved from ” https: Intel microprocessors Computer-related introductions in Intel x86 microprocessors. Webarchive template wayback links CS1 German-language sources de Use mdy dates from October All articles with unsourced statements Articles with unsourced statements from July Articles that may contain original research from September All articles that may contain original research Wikipedia articles with LCCN identifiers.

Views Read Edit View history. In other projects Wikimedia Commons. This page was last edited on 19 Decemberat By using this site, you agree to the Terms of Use and Privacy Policy. The exposed die of an Intel DX2 microprocessor. Floating-point registers 80 bits.

Early variants were parts with disabled defective FPUs. The internal processor clock runs at twice the clock rate of the external bus clock.

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Designed to run at triple clock rate not quadruple, as often believed; the DX3, which was meant to run at 2. This CPU is for embedded battery-operated and hand-held applications. Discontinued BCD oriented 4-bit