engineering sample samples qualification cpu processor prozessor information mhz pictures core frequency chip packaging info ic x86 museum collection amd cyrix harris ibm idt iit intel motorola nec sgs sgs-thomson siemens ST signetics mhs ti texas instruments ulsi hp umc weitek zilog 4004 4040 8008 808x 8085 8088 8086 80188 80186 80286 286 80386 386 i386 Am386 386sx 386dx 486 i486 586 486sx 486dx overdrive 80187 80287 387 487 pentium 586 5x86 386dlc 386slc 486dx2 mmx ppro pentium-pro pro athlon duron z80 sparc alpha dec dirk oppelt
home
Intel 386
  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-25 IV, i386 DX logo, 1985 1987
  Intel A80386DX-33 IV
  Intel A80386DX-33 IV, i386 DX logo, '85
  Intel A80386DX-33 IV, i386 DX logo, 1985 1987
  Intel NG80386SX-16, no logo
  Intel NG80386SX-16 C STEP
  Intel NG80386SX-16
  Intel NG80386SX-20 C STEP
  Intel NG80386SX-20
  Intel NG80386SX-25
  Intel NG80386SX33
  Intel KU80386EX25
  Intel KU80386SLBA-25, Engineering Sample
» Intel overview
» all 386 chips
 
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
Intel A80386-16 ΣΣ Top Side
A80386-16
S40344
L8111117
(m)(c)i '85 '86
Sigma Sigma
Intel A80386-16 ΣΣ Back Side
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.
 
add comment
Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:October 17, 1985
Manufactured:week 11/1988
Made in:Malaysia
CPU Code:i386 DX
Package Type:Ceramic
PGA-132
top of page
Intel A80386DX-16 ΣΣ
Intel A80386DX-16 ΣΣ Top Side
A80386DX-16
L8300401
(m)(c)i '85 '86
Sigma Sigma
Intel A80386DX-16 ΣΣ Back Side
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.
 
add comment
Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:October 17, 1985
Manufactured:week 30/1988
Made in:Malaysia
CPU Code:i386 DX
Package Type:Ceramic
PGA-132
top of page
Intel A80386DX-16 ΣΣ, i386 logo
Intel A80386DX-16 ΣΣ, i386 logo Top Side
A80386DX-16
SX213
L9290977
INTEL (m)(c) '85
Sigma Sigma
Intel A80386DX-16 ΣΣ, i386 logo Back Side
0918728GEB
AI 25
KOREA
add comment
Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
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
top of page
Intel A80386-20 ΣΣ
Intel A80386-20 ΣΣ Top Side
A80386-20
S40362
L8140211
(m)(c)i '85 '86
Sigma Sigma
Intel A80386-20 ΣΣ Back Side
38041550AA
MALAY
B 812
add comment
Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:February 16, 1987
Manufactured:week 14/1988
Made in:Malaysia
Package Type:Ceramic
PGA-132
top of page
Intel A80386DX-20 ΣΣ
Intel A80386DX-20 ΣΣ Top Side
A80386DX-20
L8510683
(m)(c)I '85 '86
Sigma Sigma
Intel A80386DX-20 ΣΣ Back Side
8843562SEA
AI 48
KOREA
add comment
Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:February 16, 1987
Manufactured:week 51/1988
Made in:Korea
CPU Code:i386 DX
Package Type:Ceramic
PGA-132
top of page
Intel A80386DX-20 ΣΣ, i386 logo
Intel A80386DX-20 ΣΣ, i386 logo Top Side
A80386DX-20
SX214
L9080650
(m) (c)INTEL '85
Sigma Sigma
Intel A80386DX-20 ΣΣ, i386 logo Back Side
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.
 
add comment
Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
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
top of page
Intel A80386DX-20 IV
Intel A80386DX-20 IV Top Side
A80386DX-20 IV
SX217
L0201850
(m) (c)INTEL '85
Intel A80386DX-20 IV Back Side
90121931AE
MALAY
BZ 019
add comment
Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
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
top of page
Intel A80386DX-25 IV ΣΣ
Intel A80386DX-25 IV ΣΣ Top Side
A80386DX-25 IV
SX133
L9330795
INTEL (m) (c) '85
Sigma Sigma
Intel A80386DX-25 IV ΣΣ Back Side
98502518AC
MALAY
A0 932
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
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
top of page
Intel A80386DX-25 IV
Intel A80386DX-25 IV Top Side
A80386DX-25 IV
SX218
L1264103
INTEL (m) (c) '85
Intel A80386DX-25 IV Back Side
90445893AA
MALAY
BZ 051
Donated by Jorge Segovia. Thanks a lot!  
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
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
top of page
Intel A80386DX-25 IV, i386 DX logo, '85
Intel A80386DX-25 IV, i386 DX logo, '85 Top Side
A80386DX-25 IV
L1441968
SX218
INTEL (M)(C)'85
Intel A80386DX-25 IV, i386 DX logo, '85 Back Side
8132532WEI
CH 40
KOREA
In 1991 Intel had another logo change for the 386 and introduced the i386 DX logo. This is an early version, still having the old '85. (1985 1987 on newer versions)
 
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
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
top of page
Intel A80386DX-25 IV, i386 DX logo, 1985 1987
Intel A80386DX-25 IV, i386 DX logo, 1985 1987 Top Side
A80386DX-25 IV
L2193356
SX543
INTEL (m) (c) 1985 1987
Intel A80386DX-25 IV, i386 DX logo, 1985 1987 Back Side
8206724SEA
DJ 15
KOREA
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.50
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
top of page
Intel A80386DX-33 IV
Intel A80386DX-33 IV Top Side
DX-Logo
A80386DX-33 IV
SX366
L1293710
INTEL (M)(C) '85
Intel A80386DX-33 IV Back Side
8206728AED
DJ 16
KOREA
add comment
Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.00
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
top of page
Intel A80386DX-33 IV, i386 DX logo, '85
Intel A80386DX-33 IV, i386 DX logo, '85 Top Side
DX-Logo
A80386DX-33 IV
SX366
L2102423
INTEL (M)(C) '85
Intel A80386DX-33 IV, i386 DX logo, '85 Back Side
8132536WEC
CH 40
KOREA
add comment
Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.00
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
top of page
Intel A80386DX-33 IV, i386 DX logo, 1985 1987
Intel A80386DX-33 IV, i386 DX logo, 1985 1987 Top Side
DX-Logo
A80386DX-33 IV
L2182837
SX544
(M)(C)1985 1987
Intel A80386DX-33 IV, i386 DX logo, 1985 1987 Back Side
8206728AED
DJ 16
KOREA
add comment
Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:1.00
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
top of page
The Intel i386 SX Processor
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-bit 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. Neither CPU included a math coprocessor (most motherboards included a socket for an 80387), though the naming would cause some head-scratching later when the 486 came in a DX variant that did include floating-point capability (while the 486SX did not).
 
References:  i386 Manuals and Datasheets  Wikipedia  Intel
Intel NG80386SX-16, no logo
Intel NG80386SX-16, no logo Top Side
NG80386SX-16
I8422004
(m)(c) '85 '87
Intel NG80386SX-16, no logo Back Side
38281500
CA 840
129
add comment
Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:June 16, 1988
Manufactured:week 42/1988
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
top of page
Intel NG80386SX-16 C STEP
Intel NG80386SX-16 C STEP Top Side
NG80386SX-16
C STEP
L0242425
(m) (c) '85 '87
Intel NG80386SX-16 C STEP Back Side
5002060G
CE 022
EE
Donated by Sven Brotkorb. Thanks a lot!  
add comment
Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:June 16, 1988
Manufactured:week 24/1990
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
top of page
Intel NG80386SX-16
Intel NG80386SX-16 Top Side
NG80386SX-16
L9430274
(M)(C) '85 '87
Intel NG80386SX-16 Back Side
8932221M
CB 939
E
Donated by Jorge Segovia. Thanks a lot!  
add comment
Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:June 16, 1988
Manufactured:week 40/1990
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
top of page
Intel NG80386SX-20 C STEP
Intel NG80386SX-20 C STEP Top Side
NG80386SX-20
C STEP
L1164186
(m)(c) '85 '87
Intel NG80386SX-20 C STEP Back Side
81036040
CB 114
BA
add comment
Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:January 25, 1989
Manufactured:week 16/1991
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
top of page
Intel NG80386SX-20
Intel NG80386SX-20 Top Side
NG80386SX-20
C 1490217
(m) (c) '85 '87
i386 SX
Intel NG80386SX-20 Back Side
7139534N
CD 145
CG
add comment
Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:January 25, 1989
Manufactured:week 49/1991
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
top of page
Intel NG80386SX-25
Intel NG80386SX-25 Top Side
NG80386SX-25
L2403222
(m) (c) '85 '87
i386 SX
Intel NG80386SX-25 Back Side
8231701W
AF AL38
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:October 26, 1992
Manufactured:week 40/1992
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
top of page
Intel NG80386SX33
Intel NG80386SX33 Top Side
NG80386SX33
L8221204E
(m) (c) '85 '87
i386 SX
Intel NG80386SX33 Back Side
9 04261S
QC CX 29
AF AL38
add comment
Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:October 26, 1992
Manufactured:week 22/1988
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
top of page
The Intel 386 EX Processor
The 80386 EX microprocessor is designed for embedded applications that require high integration and low power. Key features include power management, low-voltage operation, and on-chip integration of numerous common peripherals such as interrupt controllers, chip selects, counters and timers.
 
References:  Datasheet    User's Manual
Intel KU80386EX25
Intel KU80386EX25 Top Side
KU80386EX25
L4371441A
SA
(M)(C)'85'91
i386 EX
Intel KU80386EX25 Back Side
842862F
AB FS37
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:275,000
Circuit Size:0.80
Voltage:5 V
Manufactured:week 37/1994
CPU Code:i386 EX
Package Type:Plastic
PQFP-132
top of page
The Intel 386 SL Processor
In October 1990, Intel released the 80386SL, which was basically an 855,000 transistor version of the 386SX processor, with cache, bus, and memory controllers, ISA compatibility and power management circuitry. It added a special system management mode (SMM), in which the BIOS could more easily perform power management and other functions without requiring OS support. The 386SL was the first chip specifically made for portable computers.
Intel KU80386SLBA-25, Engineering Sample
Intel KU80386SLBA-25, Engineering Sample Top Side
KU80386SLBA-25
I1402112 ES
ISA SXE89
INTEL(m)(c)'85'90
Intel KU80386SLBA-25, Engineering Sample Back Side
81314GBW
CD 139
B EE
 
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:855,000
Circuit Size:1.00
Voltage:5 V
Introduced:Sept. 30, 1991
Manufactured:week 40/1991
CPU Code:i386 SL
Intel S-Spec: SXE89
Package Type:Plastic
PQFP-132
top of page