Editing Intel 4004 (section)

===The 8008===
The 4004 became the first commercial microprocessor available for general use.{{efn|Several microprocessors had been designed or built by this point, but were not available for purchase outside the products they were part of.}} This was almost not the case.{{sfn|Faggin|Hoff|Mazor|Shima|1996|p=18}}

In December 1969, Intel was approached by Computer Terminal Corporation (CTC) to produce a custom bipolar memory chip for a [[computer terminal]] they were designing, the [[Datapoint 2200]]. Mazor and Hoff considered their CPU design and concluded it was not much more complicated than the 4004, and that it could be implemented as a single-chip 8-bit CPU.{{sfn|Faggin|Hoff|Mazor|Shima|1996|p=15}} A few weeks before they hired Faggin, in March 1970 Intel hired Hal Feeney to design the [[Intel 8008]], at that time called the 1201, following Intel's naming convention. However, CTC decided to initially proceed with a conventional TTL implementation of their CPU and the project was lowered in priority. Feeney was assigned to other projects and ultimately ended up helping Faggin with testing the 4000 family chips.{{sfn|Faggin|Hoff|Mazor|Shima|1996|p=19}}

In January 1971, Feeney was reassigned back to the 1201 under Faggin's supervision and production chips were available in March 1972. In May, Hoff and Mazor went on a speaking tour to introduce the two CPU designs around the USA. The tradeoffs between the two designs were that with the 4004 and its memory and I/O chips it was much easier to build a complete computer system while the 8008 was more flexible, had a larger 16&nbsp;kB address space, and offered more instructions. A significant difference is that while a minimal 4004 system could be built using only two chips, one 4004 and one 4001 (256-byte ROM), the 8008 would require at least 20 additional TTL components for interfacing with memory and I/O functions.{{sfn|Faggin|Hoff|Mazor|Shima|1996|p=19}}

The two designs found themselves being used in different roles. The 4004 was used where the cost of implementation was the major concern, and became widely used in embedded controllers for applications like [[microwave oven]]s or traffic lights and similar roles. The 8008 instead found itself mostly used in user-programmable applications, such as [[computer terminal]]s, [[microcomputer]]s and similar roles. This split in functionality remains to this day, with the former being known as a [[microcontroller]].{{sfn|Faggin|Hoff|Mazor|Shima|1996|p=19}}