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and white with gray traces" specimen belongs to the initial CERDIP type series manufactured in 1971.]]
The Intel 4004, a 4-bit Central Processing Unit (CPU) released by Intel Corp. in 1971 , is widely considered to be the world's first commercial single- Chip Microprocessor .

Although originally designed to be a component in an Intel customer's Calculator products, the 4004 soon found many uses as a flexible replacement for collections of simple logic chips in a variety of applications, thus indicating that there existed an untapped market for microprocessors as such. This prompted Intel and some other Integrated Circuit manufacturers to embark on a path of developing steadily more capable microprocessors—a trend that eventually created the multibillion-dollar microprocessor and microcomputer industries of today.


HISTORY AND DESCRIPTION


The 4004 was released in 16-pin CERDIP packaging on November 15th , 1971 . The 4004 is the first computer processor designed and manufactured by Chip maker Intel , which previously made Semiconductor memory chips. The chief designers of the chip were Ted Hoff and Federico Faggin of Intel and Masatoshi Shima of Busicom (later of ZiLOG ).

Originally designed for the Japanese company Busicom to be used in their line of Calculator s, the 4004 was also provided with a family of custom support chips (e.g., each "Program ROM " internally latched for its own use the 4004's 12-bit program address, which allowed 4 KB memory access from the 4-bit Address Bus if all 16 ROMs were installed). The 4004 circuit was built of 2,300 Transistor s, and was followed the next year by the first ever 8-bit microprocessor, the 3,300 transistor 8008 (and the 4040 , a revised 4004).

As its fourth entry in the microprocessor market, Intel released the CPU that started the Microcomputer revolution — the 8080 .


TECHNICAL SPECIFICATIONS



  • Maximum Clock Speed is 740 KHz


    • Separate program and data storage (i.e., a Harvard Architecture ). Contrary to most Harvard architecture designs, however, which use separate Bus es, the 4004, with its need to keep pin count down, uses a single Multiplexed 4-bit bus for transferring:

    • --- 12-bit addresses

    • --- 8-bit instructions, not to be placed in the same memory as

    • --- 4-bit data Word s

    • Instruction Set contains 46 instructions (of which 41 are 8 bits wide and 5 are 16 bits wide)

    • Register set contains 16 registers of 4 bits each

    • Internal Subroutine Stack is 3 levels deep



    MICROARCHITECTURE AND PINOUT

    ''Click the pictures to view the full-size versions''.


    CUSTOM SUPPORT CHIPS


    • 4001: 256- Byte ROM (256 8-bit ''program'' instructions), and one built-in 4-bit I/O port---

    • 4002: 40-byte RAM (80 4-bit ''data'' words), and one built-in 4-bit output port; the RAM portion of the chip is organized into four "registers" of twenty 4-bit words:

    • ---16 data words (used for Mantissa digits in the original calculator design)

    • ---4 status words (used for Exponent digits and signs in the original calculator design)

    • 4003: 10-bit parallel output Shift Register for scanning keyboards, displays, printers, etc.

    • 4008: 8-bit address latch for access to standard memory chips, and one built-in 4-bit chip select and I/O port---

    • 4009: program and I/O access converter to standard memory and I/O chips---


    • ) Note: a 4001 ROM+I/O chip cannot be used in a system along with a 4008/4009 pair.



    COLLECTABILITY


    The Intel 4004, naturally, is one of world's most sought-after collectable/antique chips. Of highest value are 4004's that are gold and white, with visible so called 'grey traces' on the white portion (the original package type). As Of 2006 , such chips reached around US$1000 each on EBay . The slightly less valuable white and gold chips without grey traces typically reach $300 to $500. Those chips without a 'date code' underneath are earlier versions, and therefore worth slightly more. Other valuable chips include the Intel 4040 .


    NOTES