Intel 4040

The Intel 4040 was the successor to the Intel 4004. It was introduced in 1974.

Table of contents

1 New Features
2 Extensions
3 New Support chips

New Features

Interrupt
Single Step

Extensions

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

New Support chips

4201 - Clock Generator
4308 - 1K byte 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 - 2K byte ROM
4101 - 256 4-bit word RAM

See also List of Intel microprocessors