Intel 4040

Intel 4040 Central processing unit
An Intel D4040 Microprocessor
Produced:	From 1974 to 1981[1]
Manufacturer:	Intel
Max CPU clock:	500 kHz to 740 kHz
Instruction set:	4-bit BCD oriented
Package:	24 pin DIP

The Intel 4040 microprocessor was the successor to the Intel 4004. It was introduced in 1974. The 4040 employed a 10 μm silicon-gate enhancement load PMOS technology and could execute approximately 60,000 instructions per second.

New features

• Interrupt
• Single Step

Extensions

• Instruction Set expanded to 60 instructions
• Program memory expanded to 8 KB
• Registers expanded to 24
• Subroutine stack expanded to 7 levels deep

Designers

Federico Faggin proposed the project, formulated the architecture and led the design. The detailed design was done by Tom Innes.

New support chips

• 4201 - Clock Generator 500 to 740 kHz using 4 to 5.185 MHz crystals
• 4308 - 1 KB ROM
• 4207 - General Purpose byte Output port
• 4209 - General Purpose byte Input port
• 4211 - General Purpose byte I/O port
• 4289 - Standard Memory Interface (replaces 4008/4009)
• 4702 - 256 byte UVEPROM
• 4316 - 2 KB ROM
• 4101 - 256 4-bit word RAM

References

cs:Intel 4040

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