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{{national title|IMP-4}}
 
{{national title|IMP-4}}
The '''National IMP-4''' is a [[microprocessor family|family]] of multi-chip [[4-bit architecture|4-bit]] [[bit-slice microprocessor|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 {{national|IMP-8}} and {{national|IMP-16}} families were made using the IMP-4 logic. The IMP-4 had 2 chips: a {{national|IMP-4A/521|control unit}} and an ALU, some systems used the {{national|IMP-00A/520|RALU}} with custom control circuitry. The {{national|IMP-00A/520|RALU}} was the first [[bit-slice microprocessor|bit-slice]] microprocessor - predating both the {{intel|3000}} and the {{amd|am2900}}.
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The '''National IMP-4''' (originally '''National GPC/P''') is a [[microprocessor family|family]] of multi-chip [[4-bit architecture|4-bit]] [[bit-slice microprocessor|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 {{national|IMP-8}} and {{national|IMP-16}} families were made using the IMP-4 logic. The IMP-4 had 2 chips: a {{national|IMP-4A/521|control unit}} and an ALU, some systems used the {{national|IMP-00A/520|RALU}} with custom control circuitry. The {{national|IMP-00A/520|RALU}} was the first [[bit-slice microprocessor|bit-slice]] microprocessor - predating both the {{intel|3000}} and the {{amd|am2900}}.
  
 
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Revision as of 19:19, 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)

Design

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