1971-11-15 Intel 4004 The world's first microprocessor, the 4004 was released in 1971 by Intel. It was developed for an electronic calculator developed for Busicom (if my memory serves me right), but some foresighted engineer realized that it would be smarter to develop a generic microprocessor than making a calculator-specific chip. Intel also managed to convince the customer that Intel would keep the rights to the 4004, and the first step to a new industry was taken.
1974-04-01 Intel 8080 This early 8-bit microprocessor was used in the Altair computer and for controlling traffic ligths according to Intel.
1979-06-01 Intel 8088
1993-03-22 Intel Pentium New architecture launched at 60 and 66 MHz
1995-11-13 Intel Pentium Pro Pentium Pro launched in a two-chip package.
2000-11-20 Intel Pentium 4 P6, formerly known as Willamette, enhanced for speed in a number of ways, for example added decoders, execution units, larger buffers, a longer pipeline, an "instruction trace cache", and 256KB of on die L2 cache. The core runs at twice the clock speed and uses two ALUs. Uses a 400 MHz front side bus. Starts at 0.18 um shrinking to 0.13 later while clock speed moves from 1.5 GHz and up. Pricing 1.4 GHz: $625, 1.5 GHz: $795. Speeds up to 1.7 GHz in Q1 2001, and at or above 2 GHz in Q3.
2002-01-07 Intel Pentium 4 2.2 Willamette core shrunk to 0.13 um starting at 2.2 GHz introduced at $562. Uses the 478 pin socket and the Tehama or Brookdale North Bridge. Includes 512 kB cache.