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Path: bloom-beacon.mit.edu!hookup!europa.eng.gtefsd.com!howland.reston.ans.net!EU.net!sun4nl!tudelft.nl!liberator.et.tudelft.nl!einstein.et.tudelft.nl!offerman
From: offerman@einstein.et.tudelft.nl (Aad Offerman)
Newsgroups: comp.sys.ibm.pc.hardware.chips,comp.answers,news.answers
Subject: Personal Computer CHIPLIST 3.0
Followup-To: poster
Date: 23 Mar 1994 17:10:01 GMT
Organization: Delft University of Technology, Dept. of Electrical Engineering
Lines: 2833
Approved: news-answers-request@MIT.EDU
Message-ID: <2mpt59$kii@liberator.et.tudelft.nl>
NNTP-Posting-Host: einstein.et.tudelft.nl
Summary: This list contains the various CPU's and NPX's and their features,
used in the IBM PC, IBM PC/XT, IBM PC/AT, IBM PS/2 and compatibles,
and the differences between them.
Keywords: PC, CPU, NPX
X-Newsreader: NN version 6.5.0 #2 (NOV)
Xref: bloom-beacon.mit.edu comp.sys.ibm.pc.hardware.chips:4287 comp.answers:4306 news.answers:16783
Archive-name: pc-hardware-faq/chiplist
Last-modified: 1994/03/18
Version: 3.0
CHIP LIST 3.0 by Aad Offerman, 23-03-94.
A. Offerman
Bonnweg 40
3137NE Vlaardingen
The Netherlands
Since there are a lot of questions about the differences between the various
chips used in the IBM PC, IBM PC/XT, IBM PC/AT, IBM PS/2 and compatibles, this
list, containing their CPU's and NPX's, has been compiled for the benefit of
the net community. I hope it can answer some questions.
This list is the result of collecting many snippets of information from
Usenet and data books, and from information of various contributors of course.
Any corrections, additions, or comments are welcome. Please reply by E-mail
to:
offerman@einstein.et.tudelft.nl.
Contents:
1 Introduction
1.1 Identification
1.2 Packages
1.3 Semiconductor processes
1.4 VESA Local Bus (VLB)
1.5 SMM (System Management Mode)
1.6 JEDEC (Joint Electronic Device Engeneering Council)
1.7 Manufacturers
1.7.1 Intel
1.7.2 AMD
1.7.3 IBM (International Bussiness Machines)
1.7.4 Chips & Technologies
1.7.5 Cyrix
1.7.6 Texas Instruments
1.7.7 IIT (International Information Technologies)
1.7.8 DEC (Digital Equipment Corporation)
2 CPU (Central Processing Unit)
2.1 Introduction
2.2 Intel i4004 CPU
2.3 Intel i4040 CPU
2.4 Intel i8008 CPU
2.5 Intel i8080/i8080A CPU
2.6 Zilog Z80 CPU
2.7 Intel i8085A/i8085AH CPU
2.8 Intel i8086A/i80C86A CPU, Intel i8088A/i80C88A CPU
2.8.1 Intel i8086A/i80C86A CPU
2.8.2 Intel i8088A/i80C88A CPU
2.9 AMD Am8086/Am80C86 CPU, AMD Am8088/Am80C88 CPU
2.9.1 AMD Am8086/Am80C86 CPU
2.9.2 AMD Am8088/Am80C88 CPU
2.10 Harris HS80C86/883 CPU, Harris HS80C88/883 CPU
2.10.1 Harris HS80C86/883 CPU
2.10.2 Harris HS80C88/883 CPU
2.11 Intel i80186/i80C186 CPU, Intel i80188/i80C188 CPU
2.11.1 Intel i80186/i80C186 CPU
2.11.2 Intel i80188 CPU
2.12 NEC V30/V20 CPU
2.12.1 NEC V30 CPU
2.12.2 NEC V20 CPU
2.13 Intel i80886 CPU
2.14 Intel i80286 CPU
2.15 AMD Am80286/Am80C286 CPU
2.16 Harris 80C286 CPU
2.17 Siemens SAB80286 CPU
2.18 Intel i80386 CPU
2.18.1 Intel i80386/i80386DX CPU
2.18.2 Intel i80386SX CPU
2.18.3 Intel i80386SL CPU
2.18.4 Intel RapidCAD CPU
2.18.5 Intel i386SX microprocessor
2.18.6 Intel i386CX microprocessor
2.18.7 Intel i386EX microprocessor
2.19 AMD Am386 CPU
2.19.1 AMD Am386DX CPU
2.19.2 AMD Am386DXL CPU
2.19.3 AMD Am386DXLV CPU
2.19.4 AMD Am386SX CPU
2.19.5 AMD Am386SXL CPU
2.19.6 AMD Am386SXLV CPU
2.20 IBM 386 CPU
2.20.1 IBM 386SLC CPU
2.21 Chips & Technologies 386 CPU
2.21.1 Chips & Technologies Super386 38600DX CPU
2.21.2 Chips & Technologies 38605DX CPU
2.21.3 Chips & Technologies 38600SX CPU
2.22 IBM 386/486 hybrid CPU
2.22.1 IBM 486DLC CPU
2.22.2 IBM 486DLC2 CPU
2.22.3 IBM 486SLC CPU
2.22.4 IBM 486SLC2 CPU
2.22.5 IBM 486BLX CPU (Blue Lightening)
2.22.6 IBM 486BLX2 CPU (Blue Lightening)
2.22.7 IBM 486BLX3 CPU (Blue Lightening)
2.23 Cyrix 386/486 hybrid CPU
2.23.1 Cyrix Cx486DLC CPU
2.23.2 Cyrix Cx486SLC CPU
2.23.3 Cyrix Cx486SLC/e CPU
2.23.4 Cyrix Cx486SLC/e-V CPU
2.23.5 Cyrix Cx486DLC / Cx486SLC CPU incompatibilities
2.23.6 Cyrix Cx486DRu2 CPU
2.23.7 Cyrix Cx486DRx2 CPU
2.23.8 Cyrix Cx486SLC2 CPU
2.23.9 Cyrix Cx486SRx2 CPU
2.24 Texas Instruments 386/486 hybrid CPU
2.24.1 Texas Instruments TI486DLC CPU
2.24.2 Texas Instruments TI486SLC CPU
2.24.3 Texas Instruments TI486SXL-S-GA CPU (Potomac)
2.24.4 Texas Instruments TI486SXL-VS-GA CPU (Potomac)
2.24.5 Texas Instruments TI486SXL2-S-GA CPU (Potomac)
2.24.6 Texas Instruments TI486SXL2-VS-GA CPU (Potomac)
2.24.7 Texas Instruments TI486SXLC-PAF CPU (Potomac)
2.24.8 Texas Instruments TI486SXLC-V-PAF CPU (Potomac)
2.24.9 Texas Instruments TI486SXLC2-PAF CPU (Potomac)
2.24.10 Texas Instruments TI486SXLC2-V-PAF CPU (Potomac)
2.24.11 Texas Instruments announcements
2.25 Intel i80486 CPU
2.25.1 Intel i80486DX CPU
2.25.2 Intel i80486SL CPU
2.25.3 Intel i80486DXL CPU
2.25.4 Intel i80486SX CPU
2.25.5 Intel i80486SXL CPU
2.25.6 Intel i80486DX2 CPU
2.25.7 Intel i80486DX4 P24C CPU (announced)
2.25.8 Intel i80486 CPU announcements
2.26 AMD Am486 CPU
2.26.1 AMD Am486DX CPU
2.26.2 AMD Am486DXL CPU
2.26.3 AMD Am486DXLV CPU
2.26.4 AMD Am486DX2 CPU
2.26.5 AMD Am486DX3 CPU (announced)
2.26.6 AMD Am486SX CPU
2.26.7 AMD Am486SXLV CPU
2.26.8 AMD Am486SX2 CPU
2.26.9 AMD Am486 CPU announcements
2.27 IBM 80486 CPU
2.27.1 IBM 80486DX CPU
2.27.2 IBM 80486SX CPU
2.28 Cyrix Cx486 CPU
2.28.1 Cyrix FasCache Cx486D CPU
2.28.2 Cyrix FasCache Cx486S CPU
2.28.3 Cyrix FasCache Cx486S-V CPU
2.28.4 Cyrix FasCache Cx486S2 CPU
2.28.5 Cyrix FasCache Cx486S2-V CPU
2.28.6 Cyrix FasCache Cx486DX CPU
2.28.7 Cyrix FasCache Cx486DX-V33 CPU
2.28.8 Cyrix FasCache Cx486DX2 CPU
2.28.9 Cyrix FasCache Cx486DX2-V33 CPU
2.29 Texas Instruments TI486 CPU
2.29.1 Texas Instruments TI486SXL-GA CPU (Potomac)
2.29.2 Texas Instruments TI486SXL-V-GA CPU (Potomac)
2.29.3 Texas Instruments TI486SXL2-GA CPU (Potomac)
2.29.4 Texas Instruments TI486SXL2-V-GA CPU (Potomac)
2.30 Intel Overdrive CPU for Intel i80486 CPU
2.30.1 Intel i80486DX2 CPU for Intel i80486DX CPU (ODPR)
2.30.2 Intel i80486DX2 CPU for Intel i80486SX CPU (ODPR)
2.30.3 Intel i80486DX2 CPU for Intel i80486DX CPU or Intel i80486SX CPU (ODP)
2.30.4 Intel Pentium P24T CPU (ODP) (anounced)
2.31 Intel Pentium CPU
2.31.1 Intel Pentium P5 CPU
2.31.2 Intel Pentium P54C CPU
2.31.3 Intel Pentium CPU announcements
2.32 Intel Overdrive CPU for Intel Pentium CPU
2.32.1 Intel Pentium P54M CPU
2.33 Other CPU's
2.33.1 DEC Alpha APX CPU
2.33.2 MIPS R4000 CPU
2.33.3 MIPS R4200 CPU
2.33.4 MIPS R4400 CPU
2.33.5 MIPS R4600 CPU
2.33.6 IBM & Motorola PowerPC CPU
3 NPX (Numerical Processor eXtension)
3.1 Intel i8087 NPX
3.2 Intel i80287 NPX
3.3 AMD Am80287 NPX
3.3.1 AMD Am80C287 NPX
3.3.2 AMD Am80EC287 NPX
3.4 Cyrix Cx287 NPX
3.5 Intel i80187 NPX
3.6 Intel i80287XL NPX
3.7 Cyrix Cx82S87 NPX
3.8 IIT IIT-2C87 NPX
3.9 Intel i80387 NPX
3.9.1 Intel i80387 NPX
3.9.2 Intel i80387DX NPX
3.9.3 Intel i80387SX NPX
3.9.4 Intel i80387SL Mobile NPX
3.9.5 Intel i80X87SL Mobile NPX
3.10 Chips & Technologies SuperMath 38700 NPX
3.10.1 Chips & Technologies SuperMath 38700DX NPX
3.10.2 Chips & Technologies SuperMath 38700SX NPX
3.11 Cyrix 80387 NPX
3.11.1 Cyrix FasMath Cx83D87 NPX
3.11.2 Cyrix FasMath Cx387+ NPX
3.11.3 Cyrix FasMath EMC87 NPX
3.11.4 Cyrix FasMath 83S87 NPX
3.11.5 Cyrix Cx387DX NPX
3.11.6 Cyrix Cx387SX NPX
3.12 IIT IIT-3C87 NPX
3.12.1 IIT IIT-3C87 NPX
3.12.2 IIT IIT-3C87SX
3.12.3 IIT IIT-3C87 NPX announcements
3.13 ULSI Math*Co 83C87 NPX
3.14 ULSI Math*Co 83S87 NPX
3.15 Weitek Abacus 1167 NPX
3.16 Weitek Abacus 3167 NPX
3.17 Cyrix Cx4C87DLC NPX
3.18 IIT IIT-4C87 NPX
3.18.1 IIT IIT-4C87DLC NPX
3.18.2 IIT IIT-4C87 NPX announcements
3.19 Intel i80487 NPX
3.19.1 Intel i80487SX NPX
3.19.2 Intel i80487 NPX
3.20 Cyrix Cx487S NPX
3.21 Weitek Abacus 4167 NPX
1 Introduction
1.1 Identification
Manufacturer: name and/or logo.
Part number.
Revision number, step level.
Date: often the week number and the year of manufacturing.
Memory chips: capacity: 64, 256 kbit,
1, 4, 16 Mbit,
speed: 10 15, 20, 40, 60, 70, 80, 100, 120, 150 ns.
Orientation: indicated by a hole or a dot; from this indication the pin
numbering starts contra clock-wise with number 1.
For microprocessors at boot the chip mask revision number is often left in one
of the control registers.
1.2 Packages
DIP (Dual In-line Package): o o o o o o o o
o o o o o o o o
PGA (Pin Grid Array): o o o o o o o o
o o o o o o o o
o o o o
o o o o
o o o o
o o o o
o o o o o o o o
o o o o o o o o
ZIP (Zigzag In-line Package): o o o o o o o o
o o o o o o o o
SIMM (Single In-line Memory Module) (Wang): contains a complete RAM bank.
MAC SIMM's are only 8 bits wide; they don't contain a parity bit.
However, there are Personal Computers around in which the RAM chips for parity
checking are build-in on the motherboard, that need 8 bit SIMM's.
9-chip SIMM: 9 chips of 1 bit wide
8-chip SIMM: 8 chips of 1 bit wide (MAC)
3-chip SIMM: 2 chips of 4 bits wide and 1 chip of 1 bit wide
2-chip SIMM: 2 chips of 4 bits wide (MAC)
If the correct refresh is supplied SIMM's with a different number of chips and
different speed can be used together.
SIP (Single In-line Package): contains a complete RAM bank.
The orientation of SIMM's and SIP's is indicated by a hole. Starting from this
indication the numbering of the pins starts with number 1. Apart from the pins
there is no difference at all between SIMM's and SIP's.
The normal SIMM's and SIP's have 30 pins/pads. There are also 36 pin SIMM's and
SIP's. The extra pins are used for speed detection by the motherboard.
There are also 72 pin SIMM's. These are 32 bits and 4 parity bits wide. 4 pins
are assigned for speed detection. They are mostly used in Personal Computers
with an EISA bus (Extended Industry Standard Architecture).
Capacity: 1, 2, 4, 8, 16 Mwords.
1.3 Semiconductor processes
RTL (Resistor-Transistor Logic): SSI (Small Scale Integration).
DTL (Diode-Transistor Logic): SSI (Small Scale Integration).
TTL (Transistor-Transistor Logic) (Texas Instruments, 1965): bipolair,
SSI, MSI (Medium Scale Integration), LSI (Large Scale Integration).
7400 series: 0 - 70 C.
5400 series: -55 - 125 C (military).
5400, 7400: 10 ns propagation time,
54L00, 74L00: Low power: higher resistances, less dissipation: longer
propagation time,
54H00, 74H00: High power: lower resistances, more dissipation: less
sensitivity for noise,
54S00, 74S00: Schottky-clamped: faster switching by using Schottky diodes
to prevent the transistors from saturation,
54LS00, 74LS00: Low power, Schottky-clamped,
54AS00, 74AS00: Advanced Schottky: faster switching, less dissipation,
54ALS00, 74ALS00: Advanced Low power Schottky.
I2L (Integrated Injection Logic) (1972): bipolair,
LSI, VLSI.
Vcc: 0.8 V.
Propagation time: 20 - 50 ns.
Speed-power: 0.5 pJ.
ECL (Emitter Coupled Logic, Current Mode Logic): bipolair.
Propagation time: 0.5 - 2 ns.
Dissipation: 3 - 10 times higher than TTL.
MOS (Metal Oxide Semiconductor): FET (Field-Effect Transistors).
Maximum frequency: 25 MHz.
low-capacitance (CMOS-SOS (Silicon On Sapphire)): 100 MHz.
PMOS: LSI, VLSI (Very Large Scale Integration).
NMOS: LSI, VLSI.
HMOS: LSI, VLSI.
CMOS (Complementary Metal Oxide Semiconductor): LSI, VLSI, ULSI (Ultra Large
Scale Integration).
1.4 VESA Local Bus (VLB)
The original VESA Local Bus was designed to work with CPU's using the
Intel i80386DX CPU, Intel i80486DX CPU and Intel i80486SX CPU pinout (32 bit
data bus), running up to 40 MHz. There are also Pentium motherboards with
VESA Local Bus compatible slots.
A new version of the VESA Local Bus specification was released in 1993.
1.5 SMM (System Management Mode)
SMM can be used to manage the CPU's power demands. When a CPU enters SMM it
saves its current state in a special memory area, SMRAM (System Management
RAM) and then runs a program, also stored in in SMRAM, the SMM handler. Static
core is necessary.
SMM is implemented in all Intel i...SL CPU's. In June 1993, Intel announced
it was discontinuing its SL range and instead making all its current
processors SL enhanced. Intel has also introduced an Auto Idle state for its
clock doubled CPU's: the internal clock can be dropped down to the external
clock speed while the processor is waiting for data, returning to full speed
as soon as the data arrives.
1.6 JEDEC (Joint Electronic Device Engeneering Council)
JEDEC has suggested a new standard of 3.3 V for all electronic components,
including CPU's. CPU's operating at 3.3 V comsume less than 50 % of the power
of their 5 V equivalents. Intel currently uses a manufacturing process with a
resolution of .8 micron, but is starting production with a .6 micron process.
This produces chips that can only operate reliably at 3.3 V, which means that
all its future CPU's are likely to operate only at this lower voltage.
1.7 Manufacturers
1.7.1 Intel
Intel makes the base models: i8086/i8088, i80286, i80386, i80486, Pentium,
i8087, i80287, i80387.
Intel lost its claim to the '386' and '486' trademarks, which is why the
Pentium is not called the '586'.
Currently, Intel is fighting to protect its various patents and its copyright
of the 386 and 486 microcode. The legal situation is complicated by various
license agreements made by Intel in the past.
Intel just opened its $750,000,000 costing Fab 10 in Leixlip, Ireland. There
the 0.6 micron CMOS Intel i80486DX4 CPU and Intel Pentium CPU series are
produced. In the future the Intel P6 CPU and Intel P7 CPU series will be
produced here too.
Intel has agreed to invest $7,000,000,000 in Ireland over the next five years.
1.7.2 AMD
AMD holds a second source license which dates back to the 8086. In the early
days mainframe companies had a rule that no chip would be used in a design,
unless it could be bought from at least two companies.
AMD invented a CMOS process that was faster than Intel's and vendors started
using them as a primary source.
In the future DEC will manufacture 486 chips for AMD, increasing AMD's
production.
1.7.3 IBM (International Bussiness Machines)
IBM's licensing arrangements with Intel preclude them from selling their CPU's
directly. They can only sell these CPU's as long as they are sold with a
minimum amount of 'added value'.
IBM is not allowed to produce any FPU's.
1.7.4 Chips & Technologies
Chips & Technologies has dropped its development of X86 clones.
1.7.5 Cyrix
Cyrix implemented the chips they wanted to manufacture from the specifications
of the originals (clean room). They had Texas Instruments produce these chips
for them. A certain number is going to Cyrix to be resold, and the rest is
sold by Texas Instruments directly.
1.7.6 Texas Instruments
Texas Instruments used to be Cyrix's major producer (SGS-Thomson is the other
one). Recently, Texas Instruments stopped producing chips for Cyrix and now
make their own chips under license from Cyrix. Texas Instruments has rights to
make modifications to these chips.
1.7.7 IIT (International Information Technologies)
1.7.8 DEC (Digital Equipment Corporation)
2 CPU (Central Processing Unit)
2.1 Introduction
2.2 Intel i4004 CPU
4 bit data bus.
12 bit address bus (multiplexed).
1970.
Technology: PMOS.
Die size: 24 mm2.
2250 transistors.
First CPU ever build.
2.3 Intel i4040 CPU
Intel i4004 CPU with extra features: more instructions,
interrupt support.
4 bit data bus.
12 bit address bus (multiplexed).
1972.
Technology: PMOS.
2.4 Intel i8008 CPU
8 bit data bus.
16 bit address bus.
April 1972.
Technology: PMOS.
3300 transistors.
2.5 Intel i8080/i8080A CPU
8 bit data bus.
16 bit address bus.
Data and address bus are multiplexed.
Intel i8080 CPU: 2 MHz, PMOS.
Intel i8080A-2 CPU: 2.67 MHz, NMOS.
Intel i8080A-1 CPU: 3.125 MHz, NMOS.
Intel iM8080A: military (-55 - 125 C).
Package: 40 pin CERDIP (CERamic Dual In-line Package).
Intel i8080 CPU: 1973, PMOS, 4500 transistors.
Intel i8080A CPU: 1976, NMOS, 4000 transistors.
2.6 Zilog Z80 CPU
Intel i8080 CPU upward instruction compatible.
Not Intel i8080 CPU pin compatible (included: clock generator).
2.5 MHz: NMOS.
4 MHz: NMOS.
6 MHz: NMOS.
8 MHz: NMOS.
10 MHz: CMOS.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
2.7 Intel i8085A/i8085AH CPU
Intel i8080 CPU upward instruction compatible.
Extra instructions: SIM (Set Interrupt Mask),
RIM (Read Interrupt Mask).
Extra interrupt lines, including NMI (Non-Maskable Interrupt).
8 bit data bus.
16 bit address bus.
Data and address bus are multiplexed.
1976.
Intel i8085A CPU: 3 MHz, NMOS.
Intel iM8085A CPU: military (-55 - 125 C), NMOS.
Intel i8085AH-2 CPU: 5 MHz, HMOS.
Intel i8085AH-1 CPU: 6 MHz, HMOS.
Intel iM8085AH CPU: military (-55 - 125 C), HMOS.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
6200 transistors.
2.8 Intel i8086A/i80C86A CPU, Intel i8088A/i80C88A CPU
1 Mbyte address space, 64 kbyte per segment.
2.8.1 Intel i8086A/i80C86A CPU
16 bit internal data bus.
16 bit external data bus.
20 bit address bus.
Data and address bus are multiplexed.
1978.
Intel i8086A CPU: 4 MHz, NMOS.
Intel i8086AH CPU: 5 MHz, HMOS.
Intel i8086AH-2 CPU: 8 MHz, HMOS.
Intel i8086AH-1 CPU: 10 MHz, HMOS.
Intel i80C86A CPU: 5 MHz, CMOS.
Intel i80C86A-2 CPU: 8 MHz, CMOS.
Intel i80C86A-1 CPU: 10 MHz, CMOS.
12 Mhz: CMOS.
Intel iM80C86A CPU: military (-55 - 125 C).
Used in IBM PC clones, IBM PC/XT clones.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
29E3 transistors.
2.8.2 Intel i8088A/i80C88A CPU
16 bit internal data bus.
8 bit external data bus (can co-operate with all Intel i8085 CPU
periphery chips).
20 bit address bus.
Data and address bus are multiplexed.
1979.
Intel i80C88A CPU: 5 MHz, CMOS.
Intel i80C88A-2 CPU: 8 MHz, CMOS.
Intel i80C88A-1 CPU: 10 MHz, CMOS.
12 MHz: CMOS.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
Used in IBM PC (Personal Comuter), IBM PC/XT (eXtended Technology).
2.9 AMD Am8086/Am80C86 CPU, AMD Am8088/Am80C88 CPU
2.9.1 AMD Am8086/Am80C86 CPU
Intel i8086 CPU instruction/pin compatible.
AMD Am8086-1 CPU: 10 MHz, HMOS.
AMD Am80C86 CPU: 5 MHz, CMOS.
AMD Am80C86-2 CPU: 8 MHz, CMOS.
AMD Am80C86-1 CPU: 10 MHz, CMOS.
2.9.2 AMD Am8088/Am80C88 CPU
Intel i8088 CPU instruction/pin compatible.
AMD Am8088 CPU: 5 MHz, HMOS.
AMD Am8088-2 CPU: 8 MHz, HMOS.
AMD Am8088-1 CPU: 10 MHz, HMOS.
2.10 Harris HS80C86/883 CPU, Harris HS80C88/883 CPU
2.10.1 Harris HS80C86/883 CPU
Intel i8086 CPU instruction/pin compatible.
Harris HS80C86/883 CPU: 5 MHz, CMOS.
Harris HS80C86-2/883 CPU: 8 MHz, CMOS.
Harris HS80C86-1/883 CPU: 10 MHz, CMOS.
Harris HSMD80C86 CPU: military (-55 - 125 C), CMOS.
2.10.2 Harris HS80C88/883 CPU
Intel i8088 CPU instruction/pin compatible.
Harris HS80C88/883 CPU: 5 MHz, CMOS.
Harris HS80C88-2/883 CPU: 8 MHz, CMOS.
Harris HS80C88-1/883 CPU: 10 MHz, CMOS.
2.11 Intel i80186/i80C186 CPU, Intel i80188/i80C188 CPU
Intel i8086 CPU / Intel i8088 CPU with extra features:
2 programmable DMA controllers (Direct Memory Access),
3 timers,
PIC (Programmable Interrupt Controller),
integrated clock generator,
extra instructions: all of the Intel i80286 CPU real mode instructions.
2.11.1 Intel i80186/i80C186 CPU
16 bit internal data bus.
16 bit external data bus.
20 bit address bus.
1983.
Intel i80186 CPU: 6 MHz, NMOS.
Intel i80186 CPU: 8 MHz, NMOS.
Intel i80C186 CPU: 16 MHz, CMOS.
2.11.2 Intel i80188 CPU
16 bit internal data bus.
8 bit external data bus (can co-operate with all Intel i8085 CPU
periphery chips).
20 bit address bus.
1983.
6 MHz.
8 MHz.
Technology: NMOS.
2.12 NEC V30/V20 CPU
Intel i80186 CPU / Intel i80188 CPU upward instruction compatible.
Extra features: extra instructions: BCD,
Intel i8080 CPU simulation,
fewer CPI (Cycles Per Instruction).
2.12.1 NEC V30 CPU
Intel i8086 CPU pin compatible.
10 MHz: $10.
2.12.2 NEC V20 CPU
Intel i8088 CPU pin compatible.
8 MHz.
10 MHz: $10.
Also made by Sony under license from NEC.
2.13 Intel i80886 CPU
2.14 Intel i80286 CPU
Real mode: Intel i8086/i8088 CPU mode.
Protected mode: 16 MByte address space, 64 kbyte per segment,
1 Gbyte virtual memory.
16 bit data bus.
24 bit address bus.
1982.
6 MHz.
8 MHz: PLCC (Plastic Leaded Chip Carrier), $4.
10 MHz: PLCC (Plastic Leaded Chip Carrier), $8.
12 MHz: PLCC (Plastic Leaded Chip Carrier), $6.
16 MHz: PLCC (Plastic Leaded Chip Carrier), $9.
20 MHz.
Package: 68 pin CERDIP (CERamic Dual In-line Package).
Used in IBM PC/AT (Advanced Technology).
Technology: HMOS.
134E3 transistors.
2.15 AMD Am80286/Am80C286 CPU
Intel i80286 CPU instruction/pin compatible.
AMD Am80286 CPU: 8 MHz, HMOS.
AMD Am80286 CPU: 10 MHz, HMOS.
AMD Am80286 CPU: 12 MHz, HMOS.
AMD Am80286 CPU: 16 MHz, HMOS.
AMD Am80C286 CPU: 10 MHz, CMOS.
AMD Am80C286 CPU: 12 MHz, CMOS.
AMD Am80C286 CPU: 16 MHz, CMOS.
AMD Am80C286 CPU: 20 MHz, CMOS.
AMD Am80EC286 CPU: low power version of the AMD Am80C286 CPU.
2.16 Harris 80C286 CPU
Intel i80286 CPU instruction/pin compatible.
10 MHz.
12.5 MHz.
16 MHz.
20 MHz.
25 MHz.
Technology: CMOS.
2.17 Siemens SAB80286 CPU
Intel i80286 CPU instruction/pin compatible.
Siemens SAB80286 CPU: 8 MHz.
Siemens SAB80286-1 CPU: 10 MHz.
Siemens SAB80286-12 CPU: 12 MHz.
Siemens SAB80286-16 CPU: 16 MHz.
2.18 Intel i80386 CPU
Real mode: Intel i8086/i8088 CPU mode.
Protected mode: 64 Tbyte virtual memory, 4 Gbyte per segment.
Virtual 8086 mode (V86 mode): parallel simulation of more virtual
Intel i8086/i8088 CPU's.
POPAD bug: EAX register is trashed when there is a memory access instruction
directly after the POPAD instruction.
2.18.1 Intel i80386/i80386DX CPU
32 bit internal data bus.
32 bit external data bus (DX: Double-word eXternal).
32 bit address bus.
12 MHz: first 16 MHz CPU's had clock speed troubles and were released as
12 MHz items.
16 MHz: early Intel i80386 CPU's had a bug in the 32 bit MUL instruction (MUL
bug); it is fixed in the double-sigma step level.
20 MHz: $29.
25 MHz: $29.
33 MHz: 2000 mW, $39.
October 1985.
132 pin PGA (Pin Grid Array) package.
Technology: CMOS.
275E3 transistors.
2.18.2 Intel i80386SX CPU
32 bit internal data bus.
16 bit external data bus (SX: Single-word eXternal).
24 bit address bus.
June 1988.
16 MHz: $18.
20 MHz: $27.
25 MHz: $30.
33 MHz.
Package: 100 pin QFP (Quad Flat Package).
Technology: CMOS.
2.18.3 Intel i80386SL CPU
Low power version of the Intel i80386SX CPU: SMM (System Management Mode)
Static core.
Extra pins assigned for power management.
Intel i80386SX CPU upward pin compatible.
October 1990.
16 MHz.
20 MHz.
25 MHz.
33 MHz.
Technology: CMOS.
2.18.4 Intel RapidCAD CPU
Intel i80386 CPU with FPU (same implementation as Intel i80486DX CPU).
The Intel RapidCAD CPU consists of a set of 2 chips. The Intel RapidCAD-1
(132 pin PGA) contains the Intel i80386 CPU with FPU. The Intel RapidCAD-2
(68 pin PGA) fits in the Intel i80387DX NPX socket and contains a PLA for the
FERR signal generation.
Intel i80386DX CPU / Intel i80387DX NPX pin compatible.
1992.
25 MHz.
33 MHz: 3500 mW, $239.
Technology: CMOS.
2.18.5 Intel i386SX microprocessor
Embedded version of Intel i80386SX CPU.
Static core.
24 bit address bus.
16 MHz: 5 V, 0-16 MHz, 1993, $26.
20 MHz: 5 V, 0-20 MHz, 1993, $26.
25 MHz: 5 V, 0-25 MHz, 1993, $26.
Packaging: 100 pin PQFP (Plastic Quad Flat Package),
die,
military (-55 - 125 C).
Technology: CMOS.
2.18.6 Intel i386CX microprocessor
Embedded version of Intel i80386SX CPU.
Static core.
SMM (System Management Mode): system & power management: idle, powerdown,
powersave.
26 bit address bus.
12 MHz: 3 V, 0-12 MHz, 1993, $27.
20 MHz: 3.3 V, 0-20 MHz, 1993, $27.
25 MHz: 5 V, 0-25 MHz, 1993, $27.
Packaging: 100 pin PQFP (Plastic Quad Flat Package),
100 pin SQFP,
die,
military (-55 - 125 C).
Technology: CMOS.
2.18.7 Intel i386EX microprocessor
Embedded version of Intel i80386SX CPU.
Static core.
SMM (System Management Mode): system & power management: idle, powerdown,
powersave.
26 bit address bus.
16 MHz: 3 V, 0-16 MHz, 1994, $39.
20 MHz: 3.3 V, 0-20 MHz, 1994, $39.
25 MHz: 5 V, 0-25 MHz, 1994, $39.
Packaging: 132 pin PQFP (Plastic Quad Flat Package),
144 pin SQFP,
die,
military (-55 - 125 C).
Technology: CMOS.
2.19 AMD Am386 CPU
Intel i80386 CPU instruction compatible.
Same core and microcode as Intel i80386 CPU.
2.19.1 AMD Am386DX CPU
Low power.
Intel i80386DX CPU instruction/pin compatible.
March 1991.
16 MHz: 2-16 MHz.
20 MHz: 2-20 MHz.
25 MHz: 2-25 MHz.
33 MHz: 2-33 Mhz.
40 MHz: 2-40 MHz, $59.
Technology: CMOS.
2.19.2 AMD Am386DXL CPU
Low power version of AMD Am386DX CPU.
Static core.
Intel i80386DX CPU upward pin compatible.
March 1991.
20 MHz.
25 MHz.
33 MHz.
40 MHz.
Technology: CMOS.
2.19.3 AMD Am386DXLV CPU
Low power (SMM: System Management Mode), low voltage (3.3 V - 4.5 V) version
of AMD Am386DX CPU.
Static core.
Intel i80286DX CPU upward pin compatible.
October 1991.
25 MHz.
33 MHz.
Technology: CMOS.
2.19.4 AMD Am386SX CPU
Low power.
Extra pins assigned for power management.
Intel i80386SX CPU upward pin compatible.
July 1991.
16 MHz: 2-16 MHz.
20 MHz: 2-20 MHz.
25 MHz: 2-25 MHz, $30.
33 MHz: 2-33 MHz.
40 MHz: 2-40 MHz.
Technology: CMOS.
2.19.5 AMD Am386SXL CPU
Low power version of AMD Am386SX CPU.
Static core.
July 1991.
20 MHz: 0-20 MHz.
25 MHz: 0-25 MHz.
33 MHz: 0-33 MHz.
40 MHz: 0-40 MHz.
Technology: CMOS.
2.19.6 AMD Am386SXLV CPU
Low power (SMM: System Management Mode), low voltage (3.3 V - 4.5 V) version
of AMD Am386SX CPU.
Static core.
October 1991.
20 MHz.
25 MHz.
33 MHz.
Technology: CMOS.
2.20 IBM 386 CPU
Intel i80386 CPU instruction compatible
Some instructions are executed faster than when executed by the
Intel i80386 CPU.
2.20.1 IBM 386SLC CPU
Low power.
Extra pins assigned for power management.
8 kbyte cache.
To be enabled via software.
October 1991.
16 MHz.
20 MHz.
25 MHz: 2.5 W.
Intel i80386SX CPU upward pin compatible (100 pin MQFP).
Technology: CMOS.
Die size: 161 mm2.
2.21 Chips & Technologies 386 CPU
Intel i80386 CPU instruction compatible, including undocumented
LOADALL386 instruction.
Own microcode (clean room).
Some instructions are executed faster than when executed by the
Intel i80386 CPU.
2.21.1 Chips & Technologies Super386 38600DX CPU
Co-operation with an appropriate NPX causes communication problems, which
cause the over-all performance to drop below that of an Intel i80386DX CPU
with NPX.
Intel i80386DX CPU pin compatible.
33 MHz: $80.
40 MHz: 1650 mW.
No longer available.
Technology: CMOS.
2.21.2 Chips & Technologies 38605DX CPU
512 byte instruction cache.
32 bit internal data bus.
32 bit external data bus.
32 bit address bus.
Not Intel i80386DX CPU pin compatible.
No longer available.
144 pin PGA.
Technology: CMOS.
2.21.3 Chips & Technologies 38600SX CPU
Intel i80386SX CPU pin compatible.
Never released.
Technology: CMOS.
2.22 IBM 386/486 hybrid CPU
Intel i80486 CPU instruction compatible, no FPU (Floating Point Unit).
Intel i80386 CPU bus interface.
2.22.1 IBM 486DLC CPU
Intel i80386 CPU core, enhanced by IBM.
16 kbyte cache: 4-way set associative, write through.
To be enabled via software (BIOS).
32 bit internal data bus.
32 bit external data bus.
32 bit address bus.
Not Intel i80386DX CPU pin compatible.
Technology: CMOS.
2.22.2 IBM 486DLC2 CPU
Clock doubled version of the IBM 486DLC CPU.
Intel i80386 CPU core, enhanced by IBM.
16 kbyte cache: 4-way set associative, write through.
To be enabled via software (BIOS).
Intel i80386DX CPU pin compatible.
November 1993.
33/66 MHz.
Technology: CMOS.
2.22.3 IBM 486SLC CPU
Intel i80386 CPU core, enhanced by IBM.
16 kbyte cache: 4-way set associative, write through.
To be enabled via software (BIOS).
32 bit internal data bus.
16 bit external data bus.
24 bit address bus.
Not Intel i80386SX CPU pin compatible.
16 MHz.
20 MHz.
20 MHz: 3.3 V, 1.0 W.
25 MHz.
25 MHz: 3.3 V, 1.3 W.
Technology: CMOS.
2.22.4 IBM 486SLC2 CPU
Clock doubled version of the IBM 486SLC CPU.
Low voltage: 3.3 V.
Intel i80386 CPU core, enhanced by IBM.
16 kbyte cache: 4-way set associative, write through, 16 byte line size.
To be enabled via software (BIOS).
Intel i80386SX CPU pin compatible (100 pin MQFP).
December 1992.
16/32 MHz.
20/40 MHz: 1.7 W.
25/50 MHz: 1993, 2.3 W.
33/66 MHz: 1993.
40/80 MHz: 1993.
1.349E6 transistors.
Die size: 69 mm2.
2.22.5 IBM 486BLX CPU (Blue Lightening)
Intel i80486 CPU core and microcode.
16 kbyte cache: 4-way set associative, write through, 16 byte line size.
To be enabled via software (BIOS).
Low power (3.3 V).
Power management: SMM (System Management Mode).
Static core.
15 MHz.
20 Mhz.
25 MHz.
33 MHz.
Intel i80386DX CPU upward pin compatible / AMD Am386DXL/Am386DXLV CPU pin
compatible (132 MQFP).
Technology: .8 micron CMOS.
Die size: 82 mm2.
1.4E6 transistors.
2.22.6 IBM 486BLX2 CPU (Blue Lightening)
Clock doubled version of the IBM 486BLX CPU.
15/30 MHz.
20/40 MHz.
25/50 MHz: 1993.
33/66 MHz: 1993.
2.22.7 IBM 486BLX3 CPU (Blue Lightening)
Clock tripled version of the IBM 486BLX CPU.
15/45 MHz.
20/60 MHz.
25/75 MHz: 1993.
33/99 MHz: 1993.
2.23 Cyrix 386/486 hybrid CPU
Intel i80486 CPU instruction compatible, no FPU (Floating Point Unit).
Own core (clean room): not 100% compatible.
Intel i80386 CPU bus interface.
2.23.1 Cyrix Cx486DLC CPU
First generation 40 MHz CPU's had a bug: using a NPX (Cyrix EMC87 NPX,
Cyrix Cx83D87 NPX (until nov. 1991), IIT IIT-3C87 NPX) caused crashes. These
are caused by synchronisation errors in FSAVE and FSTOR instructions. Later,
improved CPU's have an AB prefix printed in the lower right corner. The
Cyrix 387+ NPX (European name for Cyrix Cx83D87 NPX from nov. 1991) causes
no trouble when co-operating with a bad Cyrix Cx486DLC CPU.
Static core.
1 kbyte unified cache: write through, direct mapped / 2-way set associative,
maximum of 4 non-cachable areas.
Hit rate: 65% without support of cache by motherboard, because of flush at
DMA,
85% with support of cache by motherboard (Cache Coherency Support).
To be enabled via software (BIOS).
Intel i80386DX CPU upward pin compatible.
June 1992.
25 MHz: $55.
33 MHz: $69.
40 MHz: 2800 mW, $89.
Clock Skewing Correction Circuit.
Contains a fast extra 16x16 bit multiplier.
Extra pins assigned for cache, power and A20 management:
cache management: KEN#,
FLUSH#,
RPLSET#,
RPLVAL#,
power management: SUSP#,
SUSPA#,
A20 management: A20M#.
Technology: CMOS.
2.23.2 Cyrix Cx486SLC CPU
Static core.
1 kbyte unified cache: write through, direct mapped / 2-way set associative,
maximum of 4 non-cachable areas.
hit rate: 65% without support of cache by motherboard, because of flush at
DMA,
85% with support of cache by motherboard (Cache Coherency Support).
To be enabled via software (BIOS).
Intel i80386SX CPU upward pin compatible.
March 1992.
20 MHz.
25 MHz: $128.
33 MHz: $159.
40 MHz.
Clock Skewing Correction Circuit.
Contains a fast extra 16x16 bit multiplier.
Extra pins assigned for cache, power and A20 management:
cache management: KEN#,
FLUSH#,
RPLSET#,
RPLVAL#,
power management: SUSP#,
SUSPA#,
A20 management: A20M#.
Technology: CMOS.
2.23.3 Cyrix Cx486SLC/e CPU
Low power (SMM: System Management Mode) version of Cyrix Cx486SLC CPU.
Static core.
1 kbyte unified cache: write through, direct mapped / 2-way set associative,
maximum of 4 non-cachable areas.
hit rate: 65% without support of cache by motherboard, because of flush at
DMA,
85% with support of cache by motherboard (Cache Coherency Support).
To be enabled via software (BIOS).
Intel i80386SX CPU upward pin compatible.
December 1992.
25 MHz: $128.
33 MHz: $159.
Clock Skewing Correction Circuit.
Contains a fast extra 16x16 bit multiplier.
Extra pins assigned for cache, power and A20 management:
cache management: KEN#,
FLUSH#,
RPLSET#,
RPLVAL#,
power management: SUSP#,
SUSPA#,
A20 management: A20M#.
Technology: CMOS.
2.23.4 Cyrix Cx486SLC/e-V CPU
Low power (SMM: System Management Mode), low voltage (3.3 V) version of
Cyrix Cx486SLC CPU.
Static core.
1 kbyte unified cache: write through, direct mapped / 2-way set associative,
maximum of 4 non-cachable areas.
hit rate: 65% without support of cache by motherboard, because of flush at
DMA,
85% with support of cache by motherboard (Cache Coherency Support).
To be enabled via software (BIOS).
Intel i80386SX CPU upward pin compatible.
December 1992.
20 MHz.
25 MHz.
Clock Skewing Correction Circuit.
Contains a fast extra 16x16 bit multiplier.
Extra pins assigned for cache, power and A20 management:
cache management: KEN#,
FLUSH#,
RPLSET#,
RPLVAL#,
power management: SUSP#,
SUSPA#,
A20 management: A20M#.
Technology: CMOS.
2.23.5 Cyrix Cx486DLC / Cx486SLC CPU incompatibilities
Same registers.
Same instruction set.
Differences in execution time of various instructions, average CPI (Cycles
Per Instruction) about equal.
Crashes with: NextStep,
DBOS 1.0 DOS extender of Salford FTN/386,
Fortran compiler.
2.23.6 Cyrix Cx486DRu2 CPU
Direct Replacement Unit.
'Clock doubled' version of the Cyrix Cx486DLC CPU.
In fact a Cyrix Cx486DLC CPU with some additional hardware on a little PCB
that fits in a PGA.
2 kbyte cache.
Intel i80386DX CPU upward pin compatible.
16/32 MHz.
20/40 MHz.
25/50 MHz.
2.23.7 Cyrix Cx486DRx2 CPU
Clock doubled version of the Cyrix Cx486DLC CPU.
Incompatibilities: AT&T / Olivetti 386DX-16 and 386DX-20 systems,
Sun i386 systems,
Memorex 386 systems,
IBM PS/2 Model 70/16 MHz (85 ns memory required),
early Compaq Deskpro 386/16 MHz systems with 287 NPX (NPX
to be removed).
September 1993.
16/32 MHz: $279.
20/40 MHz: heat sink, $329.
25/50 MHz: heat sink, $379.
Technology: CMOS.
2.23.8 Cyrix Cx486SLC2 CPU
Clock doubled version of the Cyrix Cx486SLC CPU
Power Management: SMM (System Management Mode).
Static core.
November 1993.
25/50 MHz.
Technology: CMOS.
2.23.9 Cyrix Cx486SRx2 CPU
Intel i80486 CPU instruction compatible, no FPU (Floating Point Unit).
Clock doubled.
The chip is placed over the surface mounted 80386SX CPU. The original CPU is
disabled by using the FLOAT pin. Older 16 MHz 80386SX CPU's can not be
upgraded (Cyrix can supply a compatibilty test program).
1 kbyte cache.
December 1993.
20 MHz: $300.
25 MHz: $300.
Technology: CMOS.
2.24 Texas Instruments 386/486 hybrid CPU
2.24.1 Texas Instruments TI486DLC CPU
Cyrix Cx486DLC CPU.
2.24.2 Texas Instruments TI486SLC CPU
Cyrix Cx486SLC CPU.
2.24.3 Texas Instruments TI486SXL-S-GA CPU (Potomac)
Intel i80486 CPU instruction compatible, no FPU.
Intel i80386DX CPU bus interface.
8 kbyte cache: write through, 2-way set associative, 1024 sets,
4 bytes per line.
40 MHz: february 1994.
Package: Ceramic PGA (Pin Grid Array).
Technology: CMOS.
2.24.4 Texas Instruments TI486SXL-VS-GA CPU (Potomac)
Low power (3.3 V) version of the Texas Instruments TI486SXL-S-GA CPU.
33 MHz: february 1994.
Technology: CMOS.
2.24.5 Texas Instruments TI486SXL2-S-GA CPU (Potomac)
Clock doubled version of the Texas Instruments TI486SXL-S-GA CPU.
20/40 MHz: february 1994, $100 (preliminary).
25/50 MHz: february 1994, $170 (preliminary).
Technology: CMOS.
2.24.6 Texas Instruments TI486SXL2-VS-GA CPU (Potomac)
Clock doubled, low power (3.3 V) version of the
Texas Instruments TI486SXL-S-GA CPU.
20/40 MHz: february 1994.
Technology: CMOS.
2.24.7 Texas Instruments TI486SXLC-PAF CPU (Potomac)
Intel i80486 CPU instruction compatible, no FPU.
Intel i80386SX CPU bus interface.
8 kbyte cache: write through, 2-way set associative, 1024 sets,
4 bytes per line.
33 MHz: february 1994.
Package: QFP (Quad Flat Package).
Technology: CMOS.
2.24.8 Texas Instruments TI486SXLC-V-PAF CPU (Potomac)
Low power (3.3 V) version of the Texas Instruments TI486SXLC-PAF CPU.
25 MHz: february 1994.
33 MHz: february 1994.
Technology: CMOS.
2.24.9 Texas Instruments TI486SXLC2-PAF CPU (Potomac)
Clock doubled version of the Texas Instruments TI486SXLC-PAF CPU.
20/40 MHz: february 1994.
25/50 MHz: february 1994.
Technology: CMOS.
2.24.10 Texas Instruments TI486SXLC2-V-PAF CPU (Potomac)
Clock doubled, low power (3.3 V) version of the
Texas Instruments TI486SXLC-PAF CPU.
20/40 MHz: february 1994.
Technology: CMOS.
2.24.11 Texas Instruments announcements
Rio Grande series: Potomac series follow-up.
2.25 Intel i80486 CPU
Intel i80386 CPU upward instruction compatible.
Extra instructions.
8 kbyte unified cache: write through, 4-way set associative, 128 sets,
16 bytes per cache line, 4 write buffers,
only invalidation of a complete cache line,
96 % hit rate.
32 bit internal data bus.
32 bit external data bus.
32 bit address bus.
Execution unit:
5-stage pipeline,
barrel shifter,
branch taken / not taken prediction (BTB: Branch Target Buffer).
Burst mode memory access: first access: 2 clock cycles,
every next access: 1 clock cycle.
2.25.1 Intel i80486DX CPU
Build-in FPU (Floating Point Unit).
April 1989.
20 MHz: CMOS.
25 MHz: 2600 mW, CHMOS IV, $219.
33 MHz: 3500 mW, CHMOS IV, $275.
50 MHz: 1991, 3875 mW, CHMOS V, $499.
Upgrading: Intel i80486DX2 CPU (ODPR), Intel Overdrive CPU (ODP:
Intel i80486DX2), Intel Overdrive CPU (ODPR: Intel Pentium CPU with
Intel i80486DX CPU bus interface), Intel Overdrive CPU (ODP:
Intel Pentium CPU).
Package: 168 pin PGA (Pin Grid Array).
1.2E6 transistors.
From June 1993:
SL Enhanced.
33 MHz.
50 MHz.
2.25.2 Intel i80486SL CPU
Intel i80486DX CPU with extra features:
DRAM controller,
ISA controller,
local PI-bus controller (Peripheral Interconnect),
power management: SMM (System Management Mode).
Static core.
25 Mhz.
33 MHz.
Not Intel i80486DX CPU pin compatible.
196 pin PQFP (Plastic Quad Flat Package).
Technology: CMOS.
From June 1993 replaced by Intel i80486DX CPU:
Low voltage: 3.3 V.
SL Enhanced.
2.25.3 Intel i80486DXL CPU
Intel i80486DX CPU with extra features: SMM (System Management Mode),
stop clock,
power saving features.
Static core.
Technology: CMOS.
2.25.4 Intel i80486SX CPU
No build-in FPU (Floating Point Unit):
Intel i80486DX CPU die with (defective) FPU disabled,
currently FPU not implemented (resulting in a smaller chip, plastic package).
One extra pin assigned to allow an Intel i80487SX NPX to dissable this CPU.
Not Intel i80486DX CPU upward pin compatible.
168 pin PGA (Pin Grid Array).
April 1991.
16 MHz: 1991.
20 MHz: 1991.
25 MHz: 1991, $85.
33 MHz: 1991, $129.
3.3 V.
Upgrading: Intel i80486DX CPU (ODPR: Intel i80486DX CPU with
Intel i80486SX CPU pin layout), Intel i80486DX2 CPU (ODPR:
Intel i80486DX2 CPU with Intel i80486SX CPU pin layout),
Intel Overdrive CPU (ODP: Intel i80486DX2 CPU), Intel Overdrive CPU
(ODPR: Intel Pentium CPU with Intel i80486SX CPU bus interface),
Intel Overdrive CPU (ODP: Intel Pentium CPU).
Package: 208 pin PQFP (Plastic Quad Flat Package).
Technology: CMOS.
From June 1993:
SL Enhanced.
25 MHz.
33 MHz.
From June 1993:
SL Enhanced.
Low Power: 3.3 V.
25 MHz.
33 MHz.
2.25.5 Intel i80486SXL CPU
Intel i80486SX CPU with extra features: SMM (System Management Mode),
stop clock,
power saving features.
static core.
Technology: CMOS.
2.25.6 Intel i80486DX2 CPU
Clock doubled version of the Intel i80486DX CPU.
Intel i80486DX CPU pin compatible.
March 1992.
20/40 MHz.
25/50 MHz: 4000 mW, $299.
33/66 MHz: 4875 mW, $360.
40/80 MHz (announced).
50/100 MHz (announced).
Upgrading: Intel Overdrive CPU (ODPR: Intel Pentium CPU with
Intel i80486DX CPU bus interface), Intel Overdrive CPU (ODP:
Intel Pentium CPU).
Technology: CMOS.
From June 1993:
SL Enhanced.
25/50 MHz.
33/66 MHz.
From Nov 1993:
SL Enhanced.
Low power: 3.3 V.
20/40 MHz.
25/50 MHz.
2.25.7 Intel i80486DX4 P24C CPU (announced)
Clock tripled version of the Intel i80486DX CPU.
5 V external, 3.3 V internal.
16 kbyte cache.
25/75 MHz: 3.3 V, 1994, $500.
33/99 MHz: 3.3 V, 1994, $500.
SL Enhanced Intel i80486DX CPU pin compatible.
Technology: 4 layer metal, 0.6 micron biCMOS.
2.25.8 Intel i80486 CPU announcements
3.3 V versions of existing and new Intel i80486 CPU's.
2.26 AMD Am486 CPU
Same core and microcode as Intel i80486 CPU's. Currently working on an own
implementation. In between there are CPU's with recompiled 486 microcode.
Intel i80486 CPU instruction compatible.
2.26.1 AMD Am486DX CPU
Intel i80486DX CPU instruction/pin compatible.
April 1993.
33 MHz: 8-33 MHz, 1993, $306.
40 MHz: 8-40 MHz, 1993, $306.
Technology: CMOS.
2.26.2 AMD Am486DXL CPU
Low power version of the AMD Am486DX CPU.
October 1993.
40 MHz.
Technology: CMOS.
2.26.3 AMD Am486DXLV CPU
Low power (SMM: System Management Mode), low voltage (3.0 V) version of the
AMD Am486DX CPU.
Static core.
October 1993.
33 MHz: 0-33 MHz, 1993.
Technology: CMOS.
2.26.4 AMD Am486DX2 CPU
Clock doubled version of the AMD Am486DX CPU.
April / October 1993.
25/50 MHz: 1993, $255.
33/66 MHz: $389.
40/80 MHz (announced).
Technology: CMOS.
2.26.5 AMD Am486DX3 CPU (announced)
Clock tripled version of the AMD Am486DX CPU.
33/99 MHz.
40/120 MHz.
Technology: CMOS.
2.26.6 AMD Am486SX CPU
Intel i80486SX CPU instruction/pin compatible.
AMD microcode.
July 1993.
33 MHz: 1993.
40 MHz: 1993.
Technology: CMOS.
2.26.7 AMD Am486SXLV CPU
Low power (SMM: System Management Mode), low voltage (3.0 V) version of the
AMD Am486SX CPU.
Static core.
AMD microcode.
July 1993.
33 MHz.
Technology: CMOS.
2.26.8 AMD Am486SX2 CPU
Clock doubled version of the AMD Am486SX CPU.
25/50 MHz: February 1994, $167/1000.
2.26.9 AMD Am486 CPU announcements
3,3 V versions of the AMD Am486DX CPU and the AMD Am486SX CPU.
2.27 IBM 80486 CPU
Intel i80486 CPU instruction compatible.
2.27.1 IBM 80486DX CPU
Intel i80486DX CPU instruction/pin compatible.
Technology: CMOS.
2.27.2 IBM 80486SX CPU
Intel i80486SX CPU instruction/pin compatible.
16 kbyte cache.
Technology: CMOS.
2.28 Cyrix Cx486 CPU
2.28.1 Cyrix FasCache Cx486D CPU
Intel i80486 CPU instruction compatible, no build-in FPU (Floating Point
Unit).
Can piggy-back a Cyrix Cx487S NPX.
2 kbyte cache: write back.
Intel i80486SX CPU upward pin compatible.
On-chip ventilator.
40 MHz: 1993.
Technology: CMOS.
2.28.2 Cyrix FasCache Cx486S CPU
Intel i80486 CPU instruction compatible, no build-in FPU (Floating Point
Unit).
Low Power: SMM (System Management Mode).
Static core.
2 kbyte cache: write back.
Intel i80486SX CPU upward pin compatible.
May 1993.
33 MHz.
40 MHz: 1993.
50 MHz.
Technology: CMOS.
2.28.3 Cyrix FasCache Cx486S-V CPU
Low voltage (3.3 V) version of the Cyrix FasCache Cx486S CPU.
May 1993.
25 MHz.
33 MHz.
Technology: CMOS.
2.28.4 Cyrix FasCache Cx486S2 CPU
Clock doubled version of the Cyrix FasCache Cx486S CPU.
October 1993.
20/40 MHz.
25/50 MHz.
Technology: CMOS.
2.28.5 Cyrix FasCache Cx486S2-V CPU
Low voltage (3.3 V) version of the Cyrix FasCache Cx4862 CPU.
October 1993.
20/40 MHz.
25/50 MHz.
Technology: CMOS.
2.28.6 Cyrix FasCache Cx486DX CPU
Intel i80486DX instruction compatible, FPU (Floating Point Unit).
Low Power: SMM (System Management Mode).
Static core.
8 kbyte cache: write through / write back.
Intel i80486DX CPU upward pin compatible.
September 1993.
33 MHz: 1993.
40 MHz: 1993, $235.
50 MHz.
Technolgy: CMOS.
2.28.7 Cyrix FasCache Cx486DX-V33 CPU
Low voltage (3.3 V) version of the Cyrix FasCache Cx486DX CPU.
September 1993.
25 MHz.
33 MHz.
Technology: CMOS.
2.28.8 Cyrix FasCache Cx486DX2 CPU
Clock doubled Cyrix FasCache Cx486DX CPU.
September 1993.
20/40 MHz.
25/50 MHz.
Technology: CMOS.
2.28.9 Cyrix FasCache Cx486DX2-V33 CPU
Low voltage (3.3V) version of the Cyrix FasCache Cx486DX2 CPU.
Technology: CMOS.
2.29 Texas Instruments TI486 CPU
2.29.1 Texas Instruments TI486SXL-GA CPU (Potomac)
Intel i80486SX CPU instruction/pin compatible.
8 kbyte cache: write through, 2-way set associative, 1024 sets,
4 bytes per line.
40 MHz: february 1994.
Package: Ceramic PGA (Pin Grid Array).
Technology: CMOS.
2.29.2 Texas Instruments TI486SXL-V-GA CPU (Potomac)
Low power (3.3 V) version of the Texas Instruments TI486SXL-GA CPU.
33 MHz: february 1994.
Technology: CMOS.
2.29.3 Texas Instruments TI486SXL2-GA CPU (Potomac)
Clock doubled version of the Texas Instruments TI486SXL-GA CPU.
20/40 MHz: february 1994.
25/50 MHz: february 1994.
Technology: CMOS.
2.29.4 Texas Instruments TI486SXL2-V-GA CPU (Potomac)
Clock doubled, low power (3.3 V) version of the
Texas Instruments TI486SXL-GA CPU.
20/40 MHz: february 1994.
Technology: CMOS.
2.30 Intel Overdrive CPU for Intel i80486 CPU
Many 486 CPU motherboards contain an Intel Overdrive socket in which a more
powerful CPU can be placed (ODP: OverDrive Processor), this being an
Intel i80486DX2 CPU or an Intel Pentium CPU. It is possible to remove the old
CPU while upgrading. All output pins of the original CPU are put in 3-state
and the power consumption is reduced when the UP# pin (Upgrade Present) is
activated.
An Intel Overdrive CPU will be made available that will fit in the original
PGA (ODPR: OverDrive Processor Replacement), so motherboards without an
Intel Overdrive socket can be upgraded too.
At this moment it is still unsure if all motherboards with an
Intel Overdrive socket can indeed be upgraded to an Intel Pentium CPU. The
Intel P24T CPU, the Intel Pentium CPU upgrade for the blue 238 pin PGA
Overdrive socket, apears to produce too much heat for most thermally not
compliant systems. It is not even sure if there will ever be an
Intel Pentium CPU upgrade for those motherboards at all. For the newer
motherboards with a white 237 pin PGA Overdrive socket, that do satisfy the
heat specifications, there will be an Intel Pentium CPU at 3,3 V with a
ventilator on the IC.
ZIF socket (Zero Insertion Force).
2.30.1 Intel i80486DX2 CPU for Intel i80486DX CPU (ODPR)
20/40 MHz: $285.
25/50 MHz: $359.
33/66 MHz: $459.
SL Enhanced from June 1993.
Package: 168 pin PGA (Pin Grid Array).
Technology: CMOS.
2.30.2 Intel i80486DX2 CPU for Intel i80486SX CPU (ODPR)
20/40 MHz: $285.
25/50 MHz: $359.
33/66 MHz: $459.
SL Enhanced from June 1993.
Package: 168 pin PGA (Pin Grid Array).
Technology: CMOS.
2.30.3 Intel i80486DX2 CPU for Intel i80486DX CPU or Intel i80486SX CPU
(ODP)
20/40 MHz: &249.
25/50 MHz: &279.
33/66 MHz: &398.
SL Enhanced from June 1993.
Package: 169 pin PGA (Pin Grid Array).
Technology: CMOS.
2.30.4 Intel Pentium P24T CPU (ODP) (anounced)
2.31 Intel Pentium CPU
2-issue 5-stage superscalar with 8-stage pipelined FPU.
Intel i80486 CPU upward instruction compatible.
Multiprocessor support.
Upgrading: adding more Intel Pentium CPU's.
Parity checking at busses.
Branch prediction (BTB: Branch Target Buffer).
8 kbyte instruction cache, 8 kbyte data cache (Harvard architecture).
Both 2-way set associative.
32 bit internal data bus (CPU - MMU (Memory Management Unit, including cache))
64 bit external data bus (MMU (Memory Management Unit, including cache)
- memory).
32 bit address bus.
2.31.1 Intel Pentium P5 CPU
May 1993.
60 MHz: 17 W, $675 (First 66 MHz CPU's had heat troubles and were released as
60 MHz items).
66 MHz: 16 W.
Technology: .8 micron biCMOS.
3.1E6 transistors.
2.31.2 Intel Pentium P54C CPU
Low Power (3.3 V).
Upgrading: Intel Pentium P54M Overdrive (2 CPU's co-operating).
60/90 MHz (Intel Pentium 735/90 CPU): March 1994.
66/100 MHz (Intel Pentium 815/100 CPU): March 1994.
50/100 MHz: 1994, 4 W (announced).
50/150 MHz: 1994 (announced).
Technology: 4 layer metal, 0.6 micron biCMOS.
3.3E6 transistors.
2.31.3 Intel Pentium CPU announcements
3,3 V Intel Pentium-66/150 CPU,
P54T: 50/75 MHz, $680.
P6: 6E6 - 8E6 transistors, Oregon.
P7: 14E6 transistors, Santa Clara, CA.
2.32 Intel Overdrive CPU for Intel Pentium CPU
2.32.1 Intel Pentium P54M CPU
Overdrive for Intel Pentium P54C CPU.
Technology: CMOS.
2.33 Other CPU's
Recently IBM announced to increase their effort on the development of the
IBM & Motorola PowerPC CPU. They expect MicroSoft's Windows NT (New Technology)
running on a RISC (Reduced Instruction Set Computer) processor (theirs) to be
the MicroSoft MS-DOS / IBM PC/AT / Intel X86 CPU follow-up. In this section
the non Intel X86 CPU's for which MicroSoft's Windows NT is available are
described.
2.33.1 DEC Alpha APX CPU
RISC (Reduced Instruction Set Computer).
133 MHz: $400/3000.
150 MHz: $500/3000.
160 MHz: $610/4000.
182 MHz: $610/7000.
200 MHz: $610/10,000.
2.33.2 MIPS R4000 CPU
RISC (Reduced Instruction Set Computer).
64 bit data bus.
36 bit address bus.
8 kbyte instruction cache, 8 kbyte data cache (Harvard architecture).
100 MHz: 5V.
LSI Logic LR4000PC CPU: 50 MHz, .7 micron CMOS.
LSI Logic LR4000MC CPU: 1/12 MHz.
LSI Logic LR4000SC CPU: 50 MHz.
Also available from NEC, IDT and Toshiba.
2.33.3 MIPS R4200 CPU
80 MHz: 3.3 V (also available from NEC).
2.33.4 MIPS R4400 CPU
100 MHz: 5 V (also available from NEC, IDT and Toshiba).
100 MHz: 3.3 V (also available from NEC, IDT and Toshiba).
133 MHz: 5 V (also available from NEC, IDT and Toshiba).
133 MHz: 3.3 V (also available from NEC, IDT and Toshiba).
150 MHz: 5 V (also available from NEC, IDT and Toshiba).
150 MHz: 3.3 V (also available from NEC, IDT and Toshiba).
2.33.5 MIPS R4600 CPU
Designed by QED.
100 MHz: 5 V (also available from IDT).
100 MHz: 3.3 V (also available from Toshiba).
2.33.6 IBM, Motorola PowerPC CPU
RISC (Reduced Instruction Set Computer).
601: 60 MHz,
66 MHz,
80 MHz: 8 W,
used in Apple Power Macintosh,
100 MHz (announced).
603: low power.
620.
3 NPX (Numerical Processor eXtension)
3.1 Intel i8087 NPX
NPX for Intel i8086 CPU, Intel i8088 CPU, Intel i80186 CPU, Intel i80188 CPU.
5 MHz (8087-3): $45.
8 MHz (8087-2): $49, HMOS.
10 MHz (8087-1): 2400 mW, $85.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
Technology: NMOS.
3.2 Intel i80287 NPX
NPX for Intel i80286 CPU, Intel i80386 CPU.
1983.
6 MHz.
8 MHz.
10 MHz: 2400 mW.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
Technology: NMOS.
3.3 AMD Am80287 NPX
3.3.1 AMD Am80C287 NPX
Intel i80287 NPX instruction/pin compatible.
Intel i80287 NPX core/microcode.
1989.
10 MHz: $50.
12 MHz: $50.
16 MHz: $50.
Package: 40 pin CERDIP (CERamic Dual In-line Package),
40 pin plastic DIP (Dual In-line Package),
44 pin PLCC (Plastic Leaded Chip Carrier).
Technoloy: CMOS.
3.3.2 AMD Am80EC287 NPX
AMD Am80C287 NPX with power management.
Technology: CMOS.
3.4 Cyrix Cx287 NPX
Intel i80287 NPX instruction/pin compatible.
8 MHz.
10 MHz.
12 MHz: $69.
16 MHz.
20 MHz.
3.5 Intel i80187 NPX
NPX for Intel i80C186 CPU.
Intel i80387 NPX core/microcode.
Intel i80387 NPX instruction compatible.
12.5 MHz: 1989, 675 mW.
16 MHz: 1989, 780 mW.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
44 pin PLCC (Plastic Leaded Chip Carrier).
Technology: CMOS.
3.6 Intel i80287XL NPX
NPX for Intel i80286 CPU, Intel i80386 CPU.
Intel i80387 NPX core/microcode.
Intel i80387 NPX instruction compatible.
Intel i80287 NPX pin compatible.
12.5 MHz: 1990, 675 mW, $85.
Package: 40 pin CERDIP (CERamic Dual In-line Package),
44 pin PLCC (Plastic Leaded Chip Carrier) (Intel i80287XLT NPX).
Technology: CMOS.
3.7 Cyrix Cx82S87 NPX
NPX for Intel i80286 CPU, Intel i80386 CPU.
Intel i80387 NPX instruction compatible.
Cyrix Cx83D87 NPX core/microcode (until november 1991)
Cyric Cx387+ NPX core/microcode (from november 1991).
6 MHz: 1991.
8 MHz: 1991.
10 MHz: 1991.
12 MHz: 1991, $69.
16 MHz: 1991.
20 MHz: 1991.
Package: 40 pin DIP (Dual In-line Package) (Intel i80287 NPX pin compatible),
44 pin PLCC (Plastic Leaded Chip Carrier) (Intel i80287XLT NPX pin
compatible).
Static core.
Technology: CMOS.
3.8 IIT IIT-2C87 NPX
NPX for Intel i80286 CPU, Intel i80386 CPU.
IIT IIT-3C87 NPX instruction compatible.
IIT IIT-3C87 NPX core/microcode.
Intel i80287 NPX pin compatible.
8 MHz: $29.
10 MHz: $39.
12 MHz: $60.
16 MHz.
20 MHz, 1989, 500 mW, $64.
Technology: CMOS.
3.9 Intel i80387 NPX
3.9.1 Intel i80387 NPX
NPX for Intel i80386/i80386DX CPU.
1986.
16 MHz: 750 mW.
20 MHz: 950 mW.
25 MHz: 1250 mW.
Package: 68 pin, 2 row ceramic PGA (Pin Grid Array).
Technology: 1.5 micron CHMOS III.
3.9.2 Intel i80387DX NPX
NPX for Intel i80386/i80386DX CPU.
Enhanced Intel i80387 NPX.
1989.
16 MHz: $75.
20 MHz: 525 mW, $75.
25 MHz: 625 mW, $75.
33 MHz: 750 mW, $75.
Package: 68 pin, 2 row PGA (Pin Grid Array).
Technology: CHMOS IV.
3.9.3 Intel i80387SX NPX
NPX for Intel i80386SX CPU.
Intel i80387 NPX core/microcode.
16 MHz: 740 mW, $75.
20 MHz: 1000 mW, $75.
25 MHz: $75.
33 MHz: &59.
Package: 68 pin PLCC (Plastic Leaded Chip Carrier).
3.9.4 Intel i80387SL Mobile NPX
NPX for Intel i80386SL CPU.
Intel i80387DX NPX core/microcode.
Extra features: cache controller,
programmable memory controller,
expanded memory support.
Static core.
Power management.
1992.
16 MHz.
20 MHz.
25 MHz: $75.
33 MHz.
Technology: CHMOS IV.
3.9.5 Intel i80X87SL Mobile NPX
NPX for Intel i80386SX CPU.
Intel i80387DX NPX core/microcode.
16 MHz.
20 MHz.
25 MHz.
3.10 Chips & Technologies SuperMath 38700 NPX
3.10.1 Chips & Technologies SuperMath 38700DX NPX
Intel i80387DX NPX instruction/pin compatible.
Power Management.
16 MHz: 1991.
20 MHz: 1991.
25 MHz: 1991.
33 MHz: 1991.
40 MHz: 1991.
No longer available.
Technology: 1.2 micron CMOS.
3.10.2 Chips & Technologies SuperMath 38700SX NPX
Intel i80387SX NPX instruction/pin compatible.
Power management.
16 MHz: 1991.
20 MHz: 1991.
25 MHz: 1991.
No longer available.
3.11 Cyrix 80387 NPX
3.11.1 Cyrix FasMath Cx83D87 NPX
Intel i80387DX NPX instruction/pin compatible.
Power management.
Computations are executed faster than by Intel i80387DX NPX.
Later versions (from november 1991) correctly co-operate with first generation
Cyrix Cx486DLC CPU's, which were having synchronization problems, when
co-operating with a NPX.
1989.
16 MHz: $64.
20 MHz: $64.
25 MHz: $64.
33 MHz: 500 mW, $64.
40 MHz: november 1991, $59.
Technology: CMOS.
3.11.2 Cyrix FasMath Cx387+ NPX
European name for Cyrix FasMath 83D87 NPX from november 1991.
40 MHz: november 1991.
3.11.3 Cyrix FasMath EMC87 NPX
Also know as Cyrix AutoMath.
Cyrix Cx83D87 NPX with extra features: memory-mapped mode.
25 MHz.
33 MHz: 2000 mW.
Package: 121 pin PGA (121 pin EMC: Extended Math Coprocessor)
Technology: CMOS.
3.11.4 Cyrix FasMath 83S87 NPX
Intel i80387SX NPX instruction/pin compatible.
Cyrix Cx387+ NPX core/microcode after november 1991
Power management.
Computations are executed faster than by Intel i80387SX NPX.
16 MHz: $57.
20 MHz: 350 mW, $57.
25 MHz: $57.
33 MHz: $75.
Technology: CMOS.
3.11.5 Cyrix Cx387DX NPX
Intel i80387DX NPX instruction/pin compatible.
16 MHz.
20 MHz.
25 MHz.
33 MHz.
40 MHz.
Technology: CMOS.
3.11.6 Cyrix Cx387SX NPX
Intel i80387SX NPX instruction/pin compatible.
16 MHz.
20 MHz.
25 MHz.
33 MHz.
Technology: CMOS.
3.12 IIT IIT-3C87 NPX
NPX for Intel i80386 CPU.
Not fully Intel i80387 NPX instruction compatible.
Extra features.
3.12.1 IIT IIT-3C87 NPX
NPX for Intel i80386/i80386DX CPU.
1989.
16 MHz: $69.
20 MHz: $69.
25 MHz: $69.
33 MHz: $69.
40 MHz: 600 mW, $69.
Intel i80387DX NPX pin compatible.
Technology: CMOS.
3.12.2 IIT IIT-3C87SX
16 MHz: $69.
20 MHz: $69.
25 MHz: $69.
33 MHz: $69.
40 MHz.
Intel i80387SX NPX pin compatible.
Technology: CMOS.
3.12.3 IIT IIT-3C87 NPX announcements
Clock doubled versions of IIT IIT-3C87 NPX and IIT IIT-3C87SX NPX.
3.13 ULSI Math*Co 83C87 NPX
Intel i80387DX NPX instruction/pin compatible.
1991.
20 MHz: 400 mW.
25 MHz: 500 mW.
33 MHz: 625 mW, $59.
40 MHz: 750 mW, $59.
Technology: CMOS.
3.14 ULSI Math*Co 83S87 NPX
Intel i80387SX NPX instruction/pin compatible.
Power management.
16 MHz: 300 mW.
20 MHz: 350 mW.
25 MHz: 400 mW.
3.15 Weitek Abacus 1167 NPX
NPX for Intel i80386DX CPU.
Not Intel i80387 NPX instruction compatible.
In fact a small PCB with three chips mounted on it.
Not Intel i80387DX NPX pin compatible.
3.16 Weitek Abacus 3167 NPX
NPX for Intel i80386DX CPU, Intel i80486 CPU.
Not Intel i80387 NPX instruction compatible.
Not Intel i80387DX NPX pin compatible.
121 pin, 3 row PGA (Pin Grid Array) (EMC socket).
Can be used together with Intel i80387DX NPX. If the motherboard has no apart
PGA for the Abacus, two NPX's can be used simultaniously by installing an
extra PCB, containing two PGA's, on the original PGA.
20 MHz: $29.
25 MHz: 1750 mW, $79.
33 MHz: 2250 mW, $169.
40 MHz: &199.
3.17 Cyrix Cx4C87DLC NPX
NPX for Cyrix Cx486DLC CPU.
25 MHz.
33 MHz.
40 MHz.
Intel 80387DX NPX pin compatible.
Technology: CMOS.
3.18 IIT IIT-4C87 NPX
3.18.1 IIT IIT-4C87DLC NPX
NPX for 486DLC CPU.
40 MHz.
Intel 80387DX NPX pin compatible.
Technology: CMOS.
3.18.2 IIT IIT-4C87 NPX announcements
Clock doubled versions of IIT-4C87DLC NPX.
3.19 Intel i80487 NPX
NPX for Intel i80486SX CPU.
3.19.1 Intel i80487SX NPX
In fact an Intel i80486DX with different pin layout (in Intel i80487SX NPX
socket) and one extra pin assigned to disable the Intel i80486SX CPU. The
Intel i80486SX CPU can be removed.
20 MHz: 3250 mW.
25 MHz: $329.
Package: 169 pin PGA (Pin Grid Array).
Technology: CMOS.
3.19.2 Intel i80487 NPX
In fact an Intel i80486DX with Intel i80486SX pin layout (in
Intel i80486SX CPU socket).
25 MHz: $329.
Technology: CMOS.
3.20 Cyrix Cx487S NPX
NPX for Cyrix FasCache Cx486D CPU.
Technology: CMOS.
3.21 Weitek Abacus 4167 NPX
NPX for Intel i80486 CPU.
Not Intel i80387 NPX instruction compatible.
25 MHz: 2500 mW, $299.
33 MHz: $529.
Package: 142 pin, 3 row PGA.
Credits: MarK E. Nijdam ;-),
Norbert Juffa (s_juffa@iravcl.ira.uka.de):
Performance Comparison Intel 386DX, Intel RapidCAD, C&T 38600DX,
Cyrix 486DLC (Usenet),
Everything You Always Wanted to Know about Math Coprocessors
(Usenet),
George Wang (georgew@pacsg.csg.mot.com),
Shark Yeuk-Hai Mok (yhmok@shark.mti.sgi.com),
Wayne Schlitt (backbone!wayne@tower.tssi.com).
Compiled, Copyright 1993, 1994 by A. Offerman. Permission to use, copy or
distribute this document for non-commercial use is hereby granted, provided
that this copyright and permission notice appear in all copies.
This document is provided "as is" without expressed or implied warranty.
The specific products and their respective manufacturers are not to be taken
as endorsements of, nor commercials for, the manufacturer.
--
*************************************************************************
* A. Offerman <offerman@einstein.et.tudelft.nl> *
* Delft University of Technology *
* Department of Electrical Engineering *
* Department of Computer Science *
* *
* The Golden Rule: "He who has the gold makes the rules". *
*************************************************************************
