Semiconductor & Computer Engineering
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Difference between revisions of "national semiconductor/imp-4"
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| {{national|IMP-00A/520}} || {{national|IMP-00A/420}} || Register and Arithmetic Logic Unit (RALU) | | {{national|IMP-00A/520}} || {{national|IMP-00A/420}} || Register and Arithmetic Logic Unit (RALU) | ||
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| + | ==2nd sources== | ||
| + | [[Rockwel]] was the only 2nd source for the IMP-4 series. Some USSR clones are known to exist. | ||
== Design == | == Design == | ||
Revision as of 18:21, 5 November 2015
The National IMP-4 (originally National GPC/P) 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) |
2nd sources
Rockwel was the only 2nd source for the IMP-4 series. Some USSR clones are known to exist.
Design
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