Semiconductor & Computer Engineering
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IMP-4 - National Semiconductor
The National IMP-4 is a family of multi-chip 4-bit bit-slice microprocessor developed by National Semiconductor and introduced in 1974. Units could be combined to implement systems with 4 to 32-bit words. The IMP-8 and IMP-16 families were made using the IMP-4 logic. The IMP-4 had 2 chips: a control unit and an ALU, some systems used the RALU with custom control circuitry. The RALU was the first bit-slice microprocessor - predating both the 3000 and the am2900.
| Family Members | ||
|---|---|---|
| Part (Commercial) |
Part (Military) |
Description |
| IMP-4A/520 | IMP-4A/420 | Bundled Kit, CROM + RALU |
| IMP-4A/521 | IMP-4A/421 | Control and Read-only Memory (CROM) |
| IMP-00A/520 | IMP-00A/420 | Register and Arithmetic Logic Unit (RALU) |
Design
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Facts about "IMP-4 - National Semiconductor"
| designer | National Semiconductor + |
| full page name | national semiconductor/imp-4 + |
| instance of | integrated circuit family + |
| main designer | National Semiconductor + |
| manufacturer | National Semiconductor + |
| name | National IMP-4 + |
| package | DIP24 + |
| process | 10,000 nm (10 μm, 0.01 mm) + |
| technology | pMOS + |
| word size | 4 bit (0.5 octets, 1 nibbles) + |