Overall view	Circuit board
(263 kB)	(2.2 MB)
first desktop calculator with implemented microprocessor; fully functional	consists of 4001-001, 4001-0102, 4001-0203, 4001-304 2 x 4002-1, 2 x 4003, 1 x 4004

Intel P4001	Intel P4002-1	Intel P4003	Intel C4004
2048-bit ROM with a 4-bit programmable I/O port gold leads, special coating	4-registers x 20-locations x 4-bit RAM data memory with 4-bit output port tin leads, special coating	I/O expansion chip incl. static shift register gold leads, special coating,	4-bit CPU grey traces, special coating with some cracks

Busicom sold its desktop calculators through NCR, with their brand name, in the United States. They also exported the calculators to Europe and Asia.
Busicom chose Mostek and Intel for the development of the chipset since these were the only two companies, who were experienced in silicon gate MOS technology at this time.
Busicom's original design required several chips, Intel's proposal was to reduce it to four chips. Ted Hoff suggested a general-purpose processor that could be programmed for various applications. In the beginning of 1970 Busicom agreed and signed a contract whereby Intel would develop the calculator chips for $60,000.
The 4004 was forwarded to Japan in March or April 1971. During this year Busicom was able to sell about 100,000 calculators. The introduction of the 4004 to the general market started in November 1971 after Intel had recovered the rights to use the microprocessor design and to market it for non-calculator applications.

Clock in form of a small book (polished brass); chip die of 4004 fixed in front of dial, advertise booklet

Distributed in November 1996 to celebrate the 25th anniversary of the microprocessor 4004.
After years of economic and technical war between US and Japanese microprocessor manufacturers now a Japanese company is involved into the production of this Intel memorabilia clock (see backside).