MCS-4/40 Family

The MCS-4 (Micro-Computer Set-4) or 4000 Series or Busicom Chip Set was a family of 4-bit microprocessor chipsets developed by Intel. The entire chipset was made of four individual chips, including the 4004 CPU which became the first commercial microprocessor. MCS-4 was completed by March 1971, entered production in June, and introduced into the market on November 15, 1971.

The MCS-40 (Micro-Computer Set-40) was a family of 4-bit microprocessor chipsets developed by Intel and introduced in 1974. The MCS-40 was an enhancement to the MCS-4. The entire chipset was made of four individual chips.

1.MCS-4/40 Family Products

Part	Description	Year	Photo
4001	2048-bit (256 x 8) ROM w/4-bit I/O Port	1971
4002	320-bit (4 x 80) RAM w/4-bit Output Port	1971
4003	10-bit Shift Register/Output Expander	1971
4004	4-bit Microprocessor	Nov 15 1971
4008	Standard Memory and I/O Interface for 4004	4th Qtr 1972
4009	Standard Memory and I/O Interface for 4004	4th Qtr 1972
4040	4-bit Microprocessor	4th Qtr 1974
4101	1024-bit (256 x 4) Static RAM w/Separate I/O	1974
4201	4 MHz Clock Generator	1st Qtr 1975
4201A	4 MHz Clock Generator	1976-77
4207	General Purpose Byte Output Port	1974
4209	General Purpose Byte Input Port	1974
4211	General Purpose Byte I/O Port	1974
4265	Programmable General Purpose I/O Device	1976
4269	Programmable Keyboard Display Device	1976
4289	Standard Memory Interface for MCS-4/40	1974
4308	8192-bit (1024 x 8) ROM w/4-bit I/O Ports	1974
4316	16384-bit (2048 x 8) Static ROM	1973-74
4316A	16384-bit (2048 x 8) Static ROM	1975-76
4702A	2048-bit (256 x 8) EPROM	1974
4801	5.185 MHz Clock Generator Crystal for 4004/4201A or 4040/4201A	1976-77

2. MCS4 Set

2.1 Intel

Grey Trace

Package	C4001	C4002-1	C4002-2	C4003	C4004
Grey Trace

White Ceramic

Package	C4001	C4002-1	C4002-2	C4003	C4004
Normal
Half Round Key
Black Dot
5 Series Left Grounding
5 Series Right Grounding

Grey Ceramic

D4001	D4002-1	D4002-2	D4003	D4004

Plastic

	P4001	P4002-1	P4002-2	P4003	P4004
Black
Grey
Yellow Print

Plastic MCS-4 - Full Set

2.2 National Semiconductor (2nd Source)

White Ceramic

Variant	INS4001D	INS4002-1D	INS4002-2D	INS4003D	INS4004D
No Grounding
Left Grounding

Gold

INS4001D	INS4002-1D	INS4002-2D	INS4003D	INS4004D

Purple Ceramic

Variant	INS4001D	INS4002-1D	INS4002-2D	INS4003D	INS4004D
Gold Pins - Squiggly Line
Silver Pins - Squiggly Line
Silver Pins - NS

Grey Ceramic

INS4001J	INS4002-1J	INS4002-2J	INS4003J	INS4004J

Plastic

Logo	INS4001N	INS4002-1N	INS4002-2N	INS4003N	INS4004N
NS Logo
Squiggly Line