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Intel 4004


Bild: Board with Intel 4004
           <<<    >>>    ^^^
Manufacturer:Telxon, Houston Texas
Type:unbekannt
Year:1976
Technology:Microprozessor C4004

In the beginning the copyright for the microprocessor i4004 belonged to the customer, the japanese "Busicom". Later, when this company ran in financial troubles, Intel bought it back for $55.000 with one restriction: The chipset was not allowed to be used in desktop- or pocket-calculators. But this kind of programmable logic had many applications like this controller of Telxon.

The processor itself is very small it has only 16 pins. With the 6-time multiplexed bus the wiring was very simple. 12 of the 16 pins could be directly to the 4002 RAM and the 4001 ROM. The remaining 4 pins served as I/O-ports. Later, when static memories like 1702-EROMs came up, intel developped the 4289, a demultiplexer. It has 40 pins, much more than the 4004 CPU.