DEC LSI-11
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. 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.

Members

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

Design

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References

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