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Intel i386 DX

Intel A80386-16 ΣΣ

Intel A80386DX-16 ΣΣ

Intel A80386DX-16 ΣΣ, i386 logo

Intel A80386-20 ΣΣ

Intel A80386DX-20 ΣΣ

Intel A80386DX-20 ΣΣ, i386 logo

Intel A80386DX-20 IV

Intel A80386DX-25 IV ΣΣ

Intel A80386DX-25 IV

Intel A80386DX-25 IV, i386 DX logo, ©'85

Intel A80386DX-33 IV

Intel A80386DX-33 IV, i386 DX logo, ©'85

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The Intel 386 Processor

The Intel 80386, introduced in October 1985, was the successor to the 80286 processor and the first Intel processor with 32-bit data and address busses. It allows multiple application programs to run at the same time (when running under 386-specific operating systems) using Protected Mode. The 386 can address four gigabytes (2^32 bytes) of memory using Enhanced Mode, a 32-bit extension of Protected Mode. As it was in the 80286, segment registers were used to index inside a segment table that described the division of memory. Unlike the 286, however, inside each segment one could use 32-bit offsets, which allowed every application to access the 4GB of memory. However, 16 megabytes was a typical maximum in IBM PCs.
In addition, Enhanced Mode supported paging, a mechanism which made it possible to use virtual memory.

The first IBM compatible to use the 386 was the Compaq 386, before IBM used it in high-end models of their PS/2 series.

With the 386, Intel introduced the 'DX' - 'SX' naming system. DX stands for Double-word eXternal, SX for Single-word eXternal. The SX versions therefore are lower-speed version of the 386(DX), introduced in 1989. They use a 16-bit instead of a 32-bit data bus.

Intel A80386-16 ΣΣ


A80386-16 S40344 L8111117 (m)(c)i '85 '86 Sigma Sigma	373642000AA MALAY B 10

Some 386DX 16MHz Intel processors had a small bug which appeared as a software problem. The bug involved occurred when running true 32-bit code in a program such as within OS/2 2.x, UNIX/386, or Windows in Enhanced mode. The bug would cause the system to lock up and is a difficult issue to determine without having Intel actually look at the chip. Chips that passed the test, and all subsequent chips which were bug-free, were marked with a double-sigma symbol. 386DX chips that are not marked with these symbols may have not been tested by Intel and may be defective.

Comment by Grampa (webmaster[at]cpu-museum.de):

Chips having an 'IV' marking also don't have this bug.

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Core Frequency:	16 MHz
Board Frequency:	16 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	October 17, 1985
Manufactured:	week 11/1988
Made in:	Malaysia
CPU Code:	i386 DX
Package Type:	Ceramic PGA-132

Intel A80386DX-16 ΣΣ


A80386DX-16 L8300401 (m)(c)i '85 '86 Sigma Sigma	8819666SAA MALAY O 827

With the 386, Intel introduced the 'DX' - 'SX' naming system. DX stands for Double-word eXternal, SX for Single-word eXternal.
This is the first processor with the DX marking.

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Core Frequency:	16 MHz
Board Frequency:	16 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	October 17, 1985
Manufactured:	week 30/1988
Made in:	Malaysia
CPU Code:	i386 DX
Package Type:	Ceramic PGA-132

Intel A80386DX-16 ΣΣ, i386 logo


A80386DX-16 SX213 L9290977 INTEL (m)(c) '85 Sigma Sigma	0918728GEB AI 25 KOREA

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Core Frequency:	16 MHz
Board Frequency:	16 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	October 17, 1985
Manufactured:	week 29/1989
Made in:	Korea
CPU Code:	i386 DX
Intel S-Spec:	SX213
Package Type:	Ceramic PGA-132

Intel A80386-20 ΣΣ


A80386-20 S40362 L8140211 (m)(c)i '85 '86 Sigma Sigma	38041550AA MALAY B 812

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Core Frequency:	20 MHz
Board Frequency:	20 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	February 16, 1987
Manufactured:	week 14/1988
Made in:	Malaysia
Package Type:	Ceramic PGA-132

Intel A80386DX-20 ΣΣ


A80386DX-20 L8510683 (m)(c)I '85 '86 Sigma Sigma	8843562SEA AI 48 KOREA

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Core Frequency:	20 MHz
Board Frequency:	20 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	February 16, 1987
Manufactured:	week 51/1988
Made in:	Korea
CPU Code:	i386 DX
Package Type:	Ceramic PGA-132

Intel A80386DX-20 ΣΣ, i386 logo


A80386DX-20 SX214 L9080650 (m) (c)INTEL '85 Sigma Sigma	8851707SAB MALAY O 907

Donated by Christian Lederer. Thanks a lot!

This is one of the first chips to use the i386 logo, introduced by Intel in 1989.

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Core Frequency:	20 MHz
Board Frequency:	20 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	February 16, 1987
Manufactured:	week 08/1989
Made in:	Malaysia
CPU Code:	i386 DX
Intel S-Spec:	SX214
Package Type:	Ceramic PGA-132

Intel A80386DX-20 IV


A80386DX-20 IV SX217 L0201850 (m) (c)INTEL '85	90121931AE MALAY BZ 019

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Core Frequency:	20 MHz
Board Frequency:	20 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	February 16, 1987
Manufactured:	week 20/1990
Made in:	Malaysia
CPU Code:	i386 DX
Intel S-Spec:	SX217
Package Type:	Ceramic PGA-132

Intel A80386DX-25 IV ΣΣ


A80386DX-25 IV SX133 L9330795 INTEL (m) (c) '85 Sigma Sigma	98502518AC MALAY A0 932

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Core Frequency:	25 MHz
Board Frequency:	25 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	April 4, 1988
Manufactured:	week 33/1989
Made in:	Malaysia
CPU Code:	i386 DX
Intel S-Spec:	SX133
Package Type:	Ceramic PGA-132

Intel A80386DX-25 IV


A80386DX-25 IV SX218 L1264103 INTEL (m) (c) '85	90445893AA MALAY BZ 051

Donated by Jorge Segovia. Thanks a lot!

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Core Frequency:	25 MHz
Board Frequency:	25 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	April 4, 1988
Manufactured:	week 52/1990
Made in:	Malaysia
CPU Code:	i386 DX
Intel S-Spec:	SX218
Package Type:	Ceramic PGA-132


A80386DX-25 IV L1441968 SX218 INTEL (M)(C)'85	8132532WEI CH 40 KOREA

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Core Frequency:	25 MHz
Board Frequency:	25 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	April 4, 1988
Manufactured:	week 44/1991
Made in:	Korea
CPU Code:	i386 DX
Intel S-Spec:	SX218
Package Type:	Ceramic PGA-132


A80386DX-25 IV L2193356 SX543 INTEL (m) (c) 1985 1987	8206724SEA DJ 15 KOREA

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Core Frequency:	25 MHz
Board Frequency:	25 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.50 µ
Voltage:	5 V
Introduced:	April 4, 1988
Manufactured:	week 19/1992
Made in:	Korea
CPU Code:	i386 DX
Intel S-Spec:	SX543
Package Type:	Ceramic PGA-132

Intel A80386DX-33 IV


DX-Logo A80386DX-33 IV SX366 L1293710 INTEL (M)(C) '85	8206728AED DJ 16 KOREA

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Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.00 µ
Voltage:	5 V
Introduced:	April 10, 1989
Manufactured:	week 29/1991
Made in:	Korea
CPU Code:	i386 DX
Intel S-Spec:	SX366
Package Type:	Ceramic PGA-132


DX-Logo A80386DX-33 IV SX366 L2102423 INTEL (M)(C) '85	8132536WEC CH 40 KOREA

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Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.00 µ
Voltage:	5 V
Introduced:	April 10, 1989
Manufactured:	week 10/1992
Made in:	Korea
CPU Code:	i386 DX
Intel S-Spec:	SX366
Package Type:	Ceramic PGA-132


DX-Logo A80386DX-33 IV L2182837 SX544 (M)(C)1985 1987	8206728AED DJ 16 KOREA

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Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	275,000
Circuit Size:	1.00 µ
Voltage:	5 V
Introduced:	April 10, 1989
Manufactured:	week 18/1992
Made in:	Korea
CPU Code:	i386 DX
Intel S-Spec:	SX544
Package Type:	Ceramic PGA-132