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The Intel Pentium Processor
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The Intel Pentium is a fifth-generation x86 architecture microprocessor, introduced on March 22, 1993. It is the successor to the 486 line. The Pentium was originally to be named 80586 or i586, but the name was changed to Pentium because numbers could not be trademarked. 586 is however, used in programming referring to all the early Pentium processors, and Pentium-like processors made by the Intel competition.
The original Pentium microprocessor had the internal code name P5, and was a pipelined in-order superscalar microprocessor, produced using a 0.8 µm process. It was followed by the second generation Pentium P54, a shrink of the P5 to a 0.6 µm process, which was dual-processor ready and had an internal clock speed different from the front side bus (it's much more difficult to increase the bus speed than to increase the internal clock). In turn, the P54 was followed by the 3rd generation P54C, which used a 0.35 µm process - a pure CMOS process, as opposed to the Bipolar CMOS process that was used for the earlier Pentiums.
The early versions of 60-100 MHz Pentiums had a problem in the floating point unit that, in rare cases, resulted in reduced precision of division operations. This bug, discovered in 1994, became known as the Pentium FDIV bug and caused great embarrassment for Intel, which created an exchange program to replace the faulty processors with corrected ones. The 60 and 66 Mhz 0.8 µm versions of the Pentium processors were also known for their fragility and their (for the time) high levels of heat production.
FDIV-Bug
Following S-Spec numbers are affected:
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| P5-50: |
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Q0399 |
| P5-60: |
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Q0352, Q0394, Q0400, Q0412, Q0466, SX753, SX835, SZ949 |
| P5-66: |
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Q0353, Q0395, Q0413, Q0467, SX754, SX837, SZ950 |
| P54-75: |
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Q0540, Q0541, Q0601, Q0606, SX951 |
| P54-90: |
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Q0542, Q0543, Q0611, Q0612, Q0613, Q0628, SX679, SX874, SX885, SX909, SX921, SX922, SX923, SX942, SX943, SX944, SZ951 |
| P54-100: |
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Q0563, Q0587, Q0614, Q0677, SX886, SX910, SX960 |
References:
Ars Technica: An Architectural History
Pentium at Wikpedia |
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Intel Pentium A80501-60 |
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A80501-60
L3281604
SX753
INTEL (M) (c) 1992 |  |
53160220NA
MALAY
ES 328
INTEL (M) (C) 1992 |
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| Core Frequency: | 60 MHz | | Board Frequency: | 60 MHz |
| Data bus (ext.): | 64 Bit | | Address bus: | 32 Bit | | Transistors: | 3,100,000 | | Circuit Size: | 0.80 µ | | Voltage: | 5 V | | Introduced: | March 22, 1993 | | Manufactured: | week 28/1993 | | Made in: | Malaysia | | L1 Cache: | 8+8 KB | | CPU Code: | Pentium
P5 | | Intel S-Spec: |
SX753 |
| Package Type: | Ceramic
PGA-273 |
| Socket: |
4 |
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Intel Pentium A80501-60 Goldcap, 'Processor'-Marking |
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A80501-60
SX835
L4050009
INTEL (M) (C) 1992 |  |
53430560AA
MALAY
F 405
INTEL (M) (C) 1992 |
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| Core Frequency: | 60 MHz | | Board Frequency: | 60 MHz |
| Data bus (ext.): | 64 Bit | | Address bus: | 32 Bit | | Transistors: | 3,100,000 | | Circuit Size: | 0.80 µ | | Voltage: | 5 V | | Introduced: | March 22, 1993 | | Manufactured: | week 05/1994 | | Made in: | Malaysia | | L1 Cache: | 8+8 KB | | CPU Code: | Pentium
P5 | | Intel S-Spec: |
SX835 |
| Package Type: | Ceramic
PGA-273
Goldcap |
| Socket: |
4 |
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Intel Pentium A80501-60 Goldcap |
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A80501-60 SX974
ICOMP INDEX=510
L4473529-0948
INTEL (M) (c) 1992 |  |
94421454NA
MALAY 452 R
INTEL (M) (c) 1992
A80501-60
SX974 |
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| Core Frequency: | 60 MHz | | Board Frequency: | 60 MHz |
| Data bus (ext.): | 64 Bit | | Address bus: | 32 Bit | | Transistors: | 3,100,000 | | Circuit Size: | 0.80 µ | | Voltage: | 5 V | | Introduced: | March 22, 1993 | | Manufactured: | week 47/1994 | | Made in: | Malaysia | | L1 Cache: | 8+8 KB | | CPU Code: | Pentium
P5 | | Intel S-Spec: |
SX974 |
| Package Type: | Ceramic
PGA-273
Goldcap |
| Socket: |
4 |
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Intel Pentium A80501-66 Goldcap |
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A80501-66 SX950
ICOMP INDEX=567
L50111934-0636
INTEL (M) (C) 1992 |  |
94393716AA
MALAY 511 S
INTEL (M) (C) 1992
A80501-66
SX950 |
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| Core Frequency: | 66 MHz | | Board Frequency: | 66 MHz |
| Data bus (ext.): | 64 Bit | | Address bus: | 32 Bit | | Transistors: | 3,100,000 | | Circuit Size: | 0.80 µ | | Voltage: | 5 V | | Introduced: | March 22, 1993 | | Manufactured: | week 01/1995 | | Made in: | Malaysia | | L1 Cache: | 8+8 KB | | CPU Code: | Pentium
P5 | | Intel S-Spec: |
SX950 |
| Package Type: | Ceramic
PGA-273
Goldcap |
| Socket: |
4 |
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