Intel 4040
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| Intel 4040 Central processing unit |
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 An Intel D4040 Microprocessor |
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| 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, was made up of 3,000 transistors[2] and could execute approximately 60,000 instructions per second.
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[edit] New features
- Interrupt
- Single Step
[edit] Extensions
- Instruction Set expanded to 60 instructions
- Program memory expanded to 8 KB
- Registers expanded to 24
- Subroutine stack expanded to 7 levels deep
[edit] Designers
Federico Faggin proposed the project, formulated the architecture and led the design. The detailed design was done by Tom Innes.
[edit] 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
[edit] References
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