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LSI-11 - DEC
< dec

The 4-chip LSI-11 and an ISA extension
Developer Digital Equipment Corporation, Western Digital
Manufacturer Western Digital
Production 1975-1985
Architecture 8-bit with 16-bit emulation
Word size 8 bit
1 octets
2 nibbles
Technology nMOS
Clock 3 MHz-7 MHz
Package DIP40

The LSI-11 was a family of 8-bit multi-chip microprocessor developed jointly by Digital Equipment Corporation and Western Digital. The LSI-11 was DEC's first large-scale integration project and was introduced to the market in 1975. The chipset was manufactured by Western Digital in nMOS technology under a $6.3M contract[1]. Originally designed for the PDP-11, Western Digital later re-branded it and sold it separately as the MCP-1600 which ended up being used in numerous other systems. The MCP-1600 went on to influence the design of other MPUs such as General Instrument's CP1600 microprocessor.


The PDP-11 only needed 4 chips for a complete minicomputer system. The 3015 added the extended instruction set capabilities.

Part Description MCP-1600-derived part
3007 Instruction Set ROM (1) CP1631-07
3010 Instruction Set ROM (2) CP1631-10
3015 Extended IS/FPU CP1631-15
1611 Data path CP1611
2007 Control unit CP1621


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  1. (1975, February 26) "Western Digital to Supply DEC". Computerworld, 43.

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Facts about "LSI-11 - DEC"
designerDigital Equipment Corporation + and Western Digital +
full page namedec/lsi-11 +
instance ofintegrated circuit family +
main designerDigital Equipment Corporation +
manufacturerWestern Digital +
nameDEC LSI-11 +
packageDIP40 +
technologynMOS +
word size8 bit (1 octets, 2 nibbles) +