MCS4 > IntelD4004

Modified: April 23, 2005, 8:50 pm

Manufacturer:	Intel
Model:	D4004
Speed:	740KHz
Type:	4004
Data Code:	7647
Introduced:	1971
Transistors:	2300
Package:	16 CDIP
Process:	10 Micron
Architecture:	4 Bit
Used in:	Calculators
Description:	The first microprocessor in history, Intel 4004 was a 4-bit CPU designed for usage in calculators, or, as we say now, designed for "embedded applications". Clocked at 740 KHz, the 4004 executed up to 92,000 single word instructions per second, could access 4 KB of program memory and 640 bytes of RAM. Although the Intel 4004 was perfect fit for calculators and similar applications it was not very suitable for microcomputer use due to its somewhat limited architecture. The 4004 lacked interrupt support, had only 3-level deep stack, and used complicated method of accessing the RAM. Some of these shortcomings were fixed in the 4004 successor - Intel 4040.