The Cyrix Cx486DLC is an x86 desktop microprocessor developed by Cyrix. It was Cyrix's second CPU offering, released years after selling math coprocessors that competed with Intel's units and offered better performance at a comparable or lower price. It was released in June of 1992, with a price of $119 for computer manufacturers.[1][2]
The 486DLC is a 486 desktop CPU from Cyrix, intended to compete with the Intel 486SX and DX. Texas Instruments, who manufactured the 486DLC for Cyrix, later released its own version of the chip, the TI486SXL, with 8 KB internal cache vs 1 KB of the original Cyrix design.[3] The similarly named IBM 486DLC, 486DLC2, 486DLC3 (aka Blue Lightning) are often confused with the Cyrix chips, but are not related and are instead based on Intel's i486 design.
Like the later and more famous Cyrix Cx5x86, it is a hybrid CPU, incorporating features of a new CPU (the Intel 80486) while plugging into its predecessor's (386DX) PGA132 socket. It runs at speeds of 25, 33, and 40 MHz.[4]
The 486DLC can be described as a 386DX with the 486 instruction set and 1 KB of on-board L1 cache added. Because it uses the 386DX bus (unlike its 16-bit cousin, the 486SLC), it is a fully 32-bit chip. Like the 386 and 486SX, it has no on-board math coprocessor, but unlike the 486SX, it can make use of an Intel 387DX or compatible numeric x87 coprocessor. Due to the smaller L1 cache, the 486DLC can not compete on a clock-for-clock basis with the 486SX, but a 33 MHz 486DLC can keep pace with a 25 MHz 486SX, cost less, and offers the ability to upgrade further with the addition of a math coprocessor.
While advertisements from smaller manufacturers touted the superiority of their 486DLC over name-brand computers sporting a 486SX, the only advantage the 486DLC offers over the 486SX is the ability to add a math coprocessor. The Intel 487 "math coprocessor" for 486SX users is a CPU replacement—a 486DX with a different pinout—and originally cost several hundred dollars more than a 387.
As prices on Intel's 486 line fell, Cyrix found it more and more difficult for its 486SLC and DLC CPUs to compete and released a fully pin-compatible version of the 486SX and DX in 1993.
The 486DLC did not see widespread use among large OEMs, but it was widely known among the hardware enthusiast community that an AMD 386DX-40 or Cyrix 486DLC-33 could keep up with a 486SX-25 at a lower cost, so it gained a small following among budget-minded enthusiasts. It was also sometimes used as a replacement for a 386 CPU to give a small speed boost. However, the 486DLC was not designed to be a direct CPU replacement and could lead to stability problems in older boards it was not intended for. "Cyrix-aware" motherboards usually had a few extra cache control lines to maintain cache coherency, as well as CPU register control in the BIOS to enable/disable the on-board cache. Cyrix later released a clock-doubled "direct replacement" upgrade package for 386DX systems called the Cx486DRu2. This kit included a standard 486DLC with an extra "dingus" that sits between the CPU and socket and provides the control lines for cache coherency. These kits were quickly superseded by the Cx486DRx2 CPU, which integrates the cache coherency circuitry into the CPU itself. The Cx486DRx2 appeared on the market in 1994, by which time the 486 was already being displaced by the Pentium. Sales were poor due to the high price and the underwhelming performance compared to a true Intel 486DX2. It was often cheaper to purchase a new 486 motherboard than to invest in an upgrade CPU.[5]
† - Can operate at nonclock-doubled 40 MHz or clock-doubled 20/40 MHz.
• - Runs at 3.3V but can tolerate 5V operation.
Cx486DRx2edit
Cx486DRx2/Cx486SRx2 Datasheet
Model
Bus Speed
Frequency
Cache
Voltage
Notes
Cx486DRx2-25/50
25 MHz
50 MHz
1 KB
5V
Upgrade version of the DLC, compatible with 386DX-16, 20, or 25 MHz systems.
Cx486DRx2-33/66
33 MHz
66 MHz
1 KB
5V
Upgrade version of the DLC, compatible with 386DX-33 MHz systems.
See alsoedit
Cyrix Cx486SLC - The notebook computer version of the 486DLC.
Referencesedit
^Quinlan, Tom (8 June 1992). "Cyrix 486DX clone hits Intel hard on price". InfoWorld. Vol. 14, no. 23. InfoWorld Media Group, Inc. p. 17. ISSN 0199-6649. Retrieved 18 February 2022.
^"Cyrix unveils desktop chip". Victoria Advocate. 6 June 1992. Retrieved 21 February 2022.
^"New TI Chips". Computerworld. 11 October 1993. p. 16. Retrieved 21 February 2022.
^"Competition benefits consumers, Advancing technology produces good buys on computer chips". Argus-Leader. 16 April 1993. p. 36. Retrieved 21 February 2022.
cyrix, cx486dlc, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, january, 2. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Cyrix Cx486DLC news newspapers books scholar JSTOR January 2021 Learn how and when to remove this template message The Cyrix Cx486DLC is an x86 desktop microprocessor developed by Cyrix It was Cyrix s second CPU offering released years after selling math coprocessors that competed with Intel s units and offered better performance at a comparable or lower price It was released in June of 1992 with a price of 119 for computer manufacturers 1 2 Cyrix Cx486DLCCyrix Cx486DLC microprocessorGeneral informationMarketed byCyrix Texas InstrumentsDesigned byCyrixCommon manufacturer s Texas Instruments SGS ThomsonPerformanceMax CPU clock rate25 MHz to 66 MHzFSB speeds25 MHz to 40 MHzCacheL1 cache1 KB Cx486 8 KB TI486SXL Architecture and classificationApplicationDesktopInstruction setIA 32 x86Physical specificationsCores1HistorySuccessor s Cyrix Cx486 Contents 1 Specifications 2 Versions 2 1 Cx486DLC 2 2 TI486DLC 2 3 TI486SXL 2 4 Cx486DRx2 3 See also 4 ReferencesSpecifications editThe 486DLC is a 486 desktop CPU from Cyrix intended to compete with the Intel 486SX and DX Texas Instruments who manufactured the 486DLC for Cyrix later released its own version of the chip the TI486SXL with 8 KB internal cache vs 1 KB of the original Cyrix design 3 The similarly named IBM 486DLC 486DLC2 486DLC3 aka Blue Lightning are often confused with the Cyrix chips but are not related and are instead based on Intel s i486 design Like the later and more famous Cyrix Cx5x86 it is a hybrid CPU incorporating features of a new CPU the Intel 80486 while plugging into its predecessor s 386DX PGA132 socket It runs at speeds of 25 33 and 40 MHz 4 The 486DLC can be described as a 386DX with the 486 instruction set and 1 KB of on board L1 cache added Because it uses the 386DX bus unlike its 16 bit cousin the 486SLC it is a fully 32 bit chip Like the 386 and 486SX it has no on board math coprocessor but unlike the 486SX it can make use of an Intel 387DX or compatible numeric x87 coprocessor Due to the smaller L1 cache the 486DLC can not compete on a clock for clock basis with the 486SX but a 33 MHz 486DLC can keep pace with a 25 MHz 486SX cost less and offers the ability to upgrade further with the addition of a math coprocessor While advertisements from smaller manufacturers touted the superiority of their 486DLC over name brand computers sporting a 486SX the only advantage the 486DLC offers over the 486SX is the ability to add a math coprocessor The Intel 487 math coprocessor for 486SX users is a CPU replacement a 486DX with a different pinout and originally cost several hundred dollars more than a 387 As prices on Intel s 486 line fell Cyrix found it more and more difficult for its 486SLC and DLC CPUs to compete and released a fully pin compatible version of the 486SX and DX in 1993 The 486DLC did not see widespread use among large OEMs but it was widely known among the hardware enthusiast community that an AMD 386DX 40 or Cyrix 486DLC 33 could keep up with a 486SX 25 at a lower cost so it gained a small following among budget minded enthusiasts It was also sometimes used as a replacement for a 386 CPU to give a small speed boost However the 486DLC was not designed to be a direct CPU replacement and could lead to stability problems in older boards it was not intended for Cyrix aware motherboards usually had a few extra cache control lines to maintain cache coherency as well as CPU register control in the BIOS to enable disable the on board cache Cyrix later released a clock doubled direct replacement upgrade package for 386DX systems called the Cx486DRu2 This kit included a standard 486DLC with an extra dingus that sits between the CPU and socket and provides the control lines for cache coherency These kits were quickly superseded by the Cx486DRx2 CPU which integrates the cache coherency circuitry into the CPU itself The Cx486DRx2 appeared on the market in 1994 by which time the 486 was already being displaced by the Pentium Sales were poor due to the high price and the underwhelming performance compared to a true Intel 486DX2 It was often cheaper to purchase a new 486 motherboard than to invest in an upgrade CPU 5 nbsp Die shot of Cx486DLC nbsp Cyrix Cx486DRx2 nbsp Die shot of Cx486DRx2 nbsp Cyrix 486DLC Cyrix 486DRx2 and TI 486DLC E nbsp TI TX486DLCVersions editCx486DLC edit TI486DLC edit Model Bus Speed Frequency Cache Voltage NotesTX486DLC 25 GA 25 MHz 25 MHz 1 KB 5V 132 pin PGA package TX486DLC 33 BGA 33 MHz 33 MHz 1 KB 5VTX486DLC E 33 GA 33 MHz 33 MHz 1 KB 5V Advanced power management 132 pin PGA package TX486DLC E V33 GA 33 MHz 33 MHz 1 KB 3 3V Advanced power management low voltage 132 pin PGA package TX486DLC 40 BGA 40 MHz 40 MHz 1 KB 5V 132 pin PGA package TX486DLC E 40 GA 40 MHz 40 MHz 1 KB 5V Advanced power management 132 pin PGA package TI486SXL edit The TI486SXL was Texas Instrument s version of the Cx486DLC They had 8 KB of cache over the original 1 KB and a 32 bit bus Reference Guide Model Bus Speed Frequency Cache Voltage NotesTI486SXL 040S GA 20 40 MHz 40 MHz 8 KB 5V 132 pin PGA package TI486SXL2 050S GA 25 MHz 50 MHz 8 KB 5VTI486SXL 040 PCE 20 40 MHz 40 MHz 8 KB 5V 144 pin TEP package TI486SXL G40 HBN 20 40 MHz 40 MHz 8 KB 3 3 5V 144 pin QFP ceramic package TI486SXL2 G50 HBN 25 MHz 50 MHz 8 KB 3 3 5V TI486SXL 040 HBN 20 40 MHz 40 MHz 8 KB 5VTI486SXL2 050 HBN 25 MHz 50 MHz 8 KB 5VTI486SXL G40 GA 20 40 MHz 40 MHz 8 KB 3 3 5V 168 pin PGA package TI486SXL2 G50 GA 25 MHz 50 MHz 8 KB 3 3 5V TI486SXL2 G66 GA 33 MHz 66 MHz 8 KB 3 3 5V TI486SXL V40 GA 20 40 MHz 40 MHz 8 KB 3 3V Low power version 168 pin PGA package TI486SXL2 V50 GA 25 MHz 50 MHz 8 KB 3 3VTI486SXL 040 GA 20 40 MHz 40 MHz 8 KB 5V 168 pin PGA package TI486SXL2 050 GA 25 MHz 50 MHz 8 KB 5V Can operate at nonclock doubled 40 MHz or clock doubled 20 40 MHz Runs at 3 3V but can tolerate 5V operation Cx486DRx2 edit Cx486DRx2 Cx486SRx2 Datasheet Model Bus Speed Frequency Cache Voltage NotesCx486DRx2 25 50 25 MHz 50 MHz 1 KB 5V Upgrade version of the DLC compatible with 386DX 16 20 or 25 MHz systems Cx486DRx2 33 66 33 MHz 66 MHz 1 KB 5V Upgrade version of the DLC compatible with 386DX 33 MHz systems See also editCyrix Cx486SLC The notebook computer version of the 486DLC References edit Quinlan Tom 8 June 1992 Cyrix 486DX clone hits Intel hard on price InfoWorld Vol 14 no 23 InfoWorld Media Group Inc p 17 ISSN 0199 6649 Retrieved 18 February 2022 Cyrix unveils desktop chip Victoria Advocate 6 June 1992 Retrieved 21 February 2022 New TI Chips Computerworld 11 October 1993 p 16 Retrieved 21 February 2022 Competition benefits consumers Advancing technology produces good buys on computer chips Argus Leader 16 April 1993 p 36 Retrieved 21 February 2022 Robert Lock October 1995 Motherboard Buying Guide Computer Retrieved 17 October 2018 Retrieved 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