A CDE Definition
The first microprocessor from Intel. Designed by Marcian E. "Ted" Hoff at Intel in 1971, it was a 4-bit, general-purpose CPU initially developed for the Japanese Busicom calculator. Running at a clock rate of 740 kHz, the 4004 could address 4KB of ROM for a program and 640 bytes of RAM for input/output.
A Small But Great Start
Given the tiny amount of RAM the 4004 supported, it was limited to calculator-like applications. Nevertheless, it was the beginning of a long line of microprocessors. The 4040 successor added interrupts, 24 index registers (up from 16) and a second 4KB program bank.
The 4004 CPU
The 4004-Based Busicom Calculator
Before/After Your Search Term
|4-pass color printer||404 error|
|40 Gigabit Ethernet||40Gbe|
|400 Gigabit Ethernet||40x CD-ROM|
Terms By Topic
Click any of the following categories for a list of fundamental terms.