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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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| TCP (Tape Carrier Package) Pentiums on adaptor boards to be plugged onto notebook connectors. Before the introduction of the MMC-1 (Mobile Module Connector 1) there were many methods to connect the CPU to a notebook. Some of them were soldered on directly, making it almost impossible to upgrade them, some used standard desktop size sockets (which took a lot of space), some were fixed on a small daughter board and attached to the mainboard. A variety of proprietary module connectors was introduced, providing a possibility to upgrade to a higher clocked version of the initial processor. |
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Intel Pentium PP100 Mobile Module |
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PP100 Y020
C626168W
I (c)'92'93 |  |
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| Core Frequency: | 100 MHz | | Board Frequency: | 66 MHz |
| Clock Multiplier: | 1.5 | | Data bus (ext.): | 64 Bit | | Address bus: | 32 Bit | | Transistors: | 3,300,000 | | Circuit Size: | 0.35 µ | | Voltage: | 2.9 V | | Introduced: | 1992 | | Manufactured: | week 26/1996 | | L1 Cache: | 16+16 KB | | Intel S-Spec: |
Y020 |
| Package Type: | Plastic
TCP-320 |
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Intel Pentium PP133 Mobile Module |
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PP133 Y019
86360135
I (c)'92'93 |  |
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| Core Frequency: | 133 MHz | | Board Frequency: | 66 MHz |
| Clock Multiplier: | 2.0 | | Data bus (ext.): | 64 Bit | | Address bus: | 32 Bit | | Transistors: | 3,300,000 | | Circuit Size: | 0.35 µ | | Voltage: | 2.9 V | | Introduced: | 1992 | | Manufactured: | week 36/1996 | | L1 Cache: | 16+16 KB | | Intel S-Spec: |
Y019 |
| Package Type: | Plastic
TCP-320 |
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Intel Pentium PP133 Mobile Module, variant |
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PP133 Y019
86450176
I (c)'92'93 |  |
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| Core Frequency: | 133 MHz | | Board Frequency: | 66 MHz |
| Clock Multiplier: | 2.0 | | Data bus (ext.): | 64 Bit | | Address bus: | 32 Bit | | Transistors: | 3,300,000 | | Circuit Size: | 0.35 µ | | Voltage: | 2.9 V | | Introduced: | 1992 | | Manufactured: | week 45/1996 | | L1 Cache: | 16+16 KB | | Intel S-Spec: |
Y019 |
| Package Type: | Plastic
TCP-320 |
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