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1991: Intel
  week 14, 1991: Intel A80486DX-25
  week 16, 1991: Intel NG80386SX-20 C STEP
  week 17, 1991: Intel A80486SX-20
  week 29, 1991: Intel A80386DX-33 IV
  week 31, 1991: Intel A80860XR-33
  week 40, 1991: Intel KU80386SLBA-25, Engineering Sample
  week 44, 1991: Intel A80386DX-25 IV, i386 DX logo, '85
  week 49, 1991: Intel NG80386SX-20
  week 50, 1991: Intel SAB 80286-8R
» Intel overview
» all chips made in 1991
 
Intel A80486DX-25
Intel A80486DX-25 Top Side
A80486DX-25
SX328
L1141153
INTEL (M) (C) 1989
Intel A80486DX-25 Back Side
90446471CD
USA
L 03
Donated by Christian Lederer. 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:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:April 10, 1989
Manufactured:week 14/1991
Made in:USA
L1 Cache:8 KB
CPU Code:i486 DX
P4
Intel S-Spec: SX328
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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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
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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
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Intel A80486SX-20
Intel A80486SX-20 Top Side
A80486SX-20
L1173927
SX406
INTEL (M) (c) 1989
Intel A80486SX-20 Back Side
91043031CD
USA
EE 15
Donated by SOFTWERK. Thanks a lot!  
Comment by Wingzero (wingzeroismine[at]yahoo.com):
The 486SX processors were the same as their DX counterparts in design, but the built in math co processor was disabled. There was a 487 which was actually a 486 with the math co processor enabled. If the motherboard had this slot for the 487, the SX cpu would be disabled and the 487 cpu would take over all processing.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Was the i486SX "Cripple-chip" really a planned release, or was it actually as rumoured to be, a genuine i486DX -33, that failed the FPU production-line tests???? I was donated an i486SX-20, and I was also donated a "full-size-AT form-factor" 486-33 m/board. This crazy-large m/board had an 80486 socket, and 4167 socket too. It also had sixteen (count them, 16) SIMM sockets, cause, what was a 16MByte SIMM??? It only understood 256kByte and 1MByte SIMMs, and it only understood the 9-chip SIMMs, not the later 3-chip SIMMs. This proved to be a bane to me, as the 9-chip SIMMs cost more than the newer/faster 3-chip units.
I put two-and-two together, and that little PGA SX-20 chip ran at 33MHz just fine. As a test, I tried to smoke-it-out by covering it with cardboard etc. to fry the thing. It would not stop running normally! (Without the cardboard), I ran it at 33MHz for years, before I sold that sytem. Last I heard, it still was fine.
 
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:April 1991
Manufactured:week 17/1991
Made in:USA
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX406
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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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
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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
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
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Intel A80860XR-33
Intel A80860XR-33 Top Side
A80860XR-33
SX352
I1312511
INTEL(M)(C)'88'89
Intel A80860XR-33 Back Side
90414171CD
USA
K 50
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:2,500,000
Circuit Size:0.80
Introduced:1988
Manufactured:week 31/1991
L1 Cache:4+8 KB
CPU Code:N10
Intel S-Spec: SX352
Package Type:Ceramic
PGA-168
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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
 
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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
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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)
 
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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
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
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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
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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
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Intel SAB 80286-8R
Intel SAB 80286-8R Top Side
SAB80286-8R
L1502429C
S50071
(M)(C)'82'85
Intel SAB 80286-8R Back Side
61211141AA
MALAY
BAF 139
An Intel 286 with Siemens SAB marking...
 
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Core Frequency:8 MHz
Board Frequency:8 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:134,000
Circuit Size:1.50
Voltage:5 V
Introduced:02/1982
Manufactured:week 50/1991
Package Type:Ceramic
LCC-68
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