MCS-4
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.
Intel
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Part |
Description | Photo |
|---|---|---|
| 4001 | ROM |   |
| 4002 | RAM |   |
| 4003 | shift register |   |
| 4004 | MPU |
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| 4008 | Address latch | |
| 4009 | I/O Interface |  |
White Ceramic
| C4001 | C4002-1 | C4002-2 | C4003 | C4004 | |
| Grey Trace |  |
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| Normal | |
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Half Round Key |
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| Black Dot |  |
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| 5 Series Left Grounding |
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| 5 Series Right Grounding |
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Grey Ceramic
| C4001 | C4002-1 | C4002-2 | C4003 | C4004 |
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Plastic
| C4001 | C4002-1 | C4002-2 | C4003 | C4004 | |
| Black |  |
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| Grey |  |
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| Yellow Print |  |
Plastic MCS-4 - Full Set
National Semiconductor (2nd Source)
White Ceramic
| Variant | INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
| No Grounding |  |
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| Left Grounding |  |
Gold
| INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
Purple Ceramic
| Variant | INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
| Gold Pins - SL |  |
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| Silver Pins - NS |  |
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| Silver Pins - SL |  |
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Grey Ceramic
| INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
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Plastic
| Logo | INS4001D | INS4002-1D | INS4002-2D | INS4003D | INS4004D |
| NS Logo |  |
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| Squiggly Line |  |