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| | Great Microprocessors of the Past and Present (V 13.4.0) |
 | | Texas Instruments followed the Intel 4004/4040 closely with the 4-bit TMS 1000, which was the first microprocessor to include enough RAM, and space for a program ROM, and I/O support on a single chip to allow it to operate without multiple external support chips, making it the first microcontroller. |
 | | The 8080 was the successor to the 8008 (April 1972, intended as a terminal controller, and similar to the 4040). |
 | | Intel updated the design with the 8085 (1976), which added two instructions to enable/disable three added interrupt pins (and the serial I/O pins), and simplified hardware by only using +5V power, and adding clock generator and bus controller circuits on-chip. |
| www.cpushack.net /CPU/cpu1.html (3452 words) |
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