Editing intel/mcs-4

{{intel title|MCS-4}}
{{ic family
| title             = Intel MCS-4
| image             = MCS-4.jpg
| caption           = The entire MCS-4 chipset: [[/4001|4001]], [[/4002|4002]], [[/4003|4003]], and [[/4004|4004]].
| developer         = Intel
| manufacturer      = Intel
| type              = Microprocessors
| production start  = 1971
| production end    = 1982
| release           = November 15, 1971
| arch              = 4-bit word, 8-bit instruction, BCD-oriented
| word              = 4 bit
| proc              = 10 μm
| tech              = pMOS
| clock min         = 500 kHz
| clock max         = 740 kHz
| package           = DIP16

| succession       = Yes
| predecessor      = 
| predecessor link = 
| successor        = MCS-40
| successor link   = intel/mcs-40
}}
The '''MCS-4''' ('''Micro-Computer Set-4''') or '''4000 Series''' or '''Busicom Chip Set''' was a [[microprocessor family|family]] of [[4-bit architecture|4-bit]] microprocessor chipsets developed by [[Intel]]. The chipset, which was made of four individual chips included the [[/4004|4004]] CPU, the first commercial microprocessor. MCS-4 was completed by March 1971, entered production in June, and introduced into the market on November 15, 1971.

== History ==
[[File:1971 Intel Advertisement.jpg|250px|thumbnail|right|An ad for the MCS-4 in the Nov. 15, 1971 issue of [[Wikipedia:Electronic News|Electronic News]]]]
Before Federico Faggin joined Intel in 1970, the development of the 4004 was rather slow. Federico developed several design innovations at Intel that made it possible to fit the microprocessor in one chip, including new methodology for random logic chip design using silicon gate technology<ref>Faggin. Il padre del chip intelligente, Angelo Gallippi, 2002, 88-7118-149-2</ref>. Faggin developed the 4004 testing tool, chip and logic design concurrently with the layout of all the chips of the entire MCS-4 system.

At the time, Intel was only known for their memory chips. On 15 November 1971, they publicly announced the first commercial microprocessor in the 15th issue of [[Wikipedia:Electronic News|Electronic News]]. The prophetic ad read: ''"Announcing a new era in integrated electronics"''. The chip was designed by Federico Faggin, Ted Hoff and Masatoshi Shima; it received U.S. Patent [http://www.google.com/patents/US3821715 #3,821,715].

All the MCS-4 components were packaged in 16-pin ceramic [[Dual in-line package|DIP]]. The 16-pin package, which proved to be the most problematic  restriction was imposed by management.

== Components ==
The MCS-4 can be minimally functioning with just the [[/4001|4001]] [[ROM]] and the [[/4004|4004]] [[CPU]], however its designed to be fully functioning with [[RAM]] and [[shift register]]. Additionally two more chips, the [[/4008|4008]] and [[/4009|4009]], expand the system to work with any of Intel's existing memory chip selections.

{| class="wikitable"
! Part !! Description
|-
| [[/4001|4001]] || [[ROM]]
|-
| [[/4002|4002]] || [[RAM]]
|-
| [[/4003|4003]] || [[shift register]]
|-
| [[/4004|4004]] || [[MPU]]
|-
| [[/4008|4008]] || Address latch
|-
| [[/4009|4009]] || I/O Interface
|}

== Architecture==
{{empty section}}
[[File:intel mcs-4.svg|800px]]

== Lead Designers ==
Lead designers for the MCS-4 family were:
* [[designer::Ted Hoff]]
* [[designer::Federico Faggin]]
* [[designer::Stan Mazor]]
* [[designer::Masatoshi Shima]]

== Documents==
* [[:File:MCS-4 Manual.pdf|MCS-4 Manual]]
* [[:File:Intel MCS-4 Data Sheet.pdf|MCS-4 Data Sheet]]

== References ==
{{reflist}}

== See Also ==
* {{intel|MCS-8}}



{{stub}}
designer	Intel +, Ted Hoff +, Federico Faggin +, Stan Mazor + and Masatoshi Shima +
full page name	intel/mcs-4 +
instance of	microprocessor family +
main designer	Intel +
manufacturer	Intel +
name	Intel MCS-4 +
package	DIP16 +
process	10,000 nm (10 μm, 0.01 mm) +
technology	pMOS +
word size	4 bit (0.5 octets, 1 nibbles) +