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Notes on the Intel 8086 processor's arithmetic-logic unit

Ken Shirriff Blog · published 23 January 2026

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https://static.righto.com/images/8086-alu-notes/die-labeled2.jpg

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https://www.righto.com/2022/11/how-8086-processors-microcode-engine.html

righto.com

https://www.righto.com/2013/01/inside-alu-of-8085-microprocessor.html

righto.com

https://www.righto.com/2013/09/the-z-80-has-4-bit-alu-heres-how-it.html

righto.com

https://www.righto.com/2020/08/reverse-engineering-8086s.html

righto.com

https://static.righto.com/images/8086-alu-notes/alu-schematic.png

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https://static.righto.com/images/8086-alu-notes/logic-labeled.jpg

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https://bsky.app/profile/righto.com

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8086 microcode disassembled Read at the source ↗

Undocumented 8086 instructions, explained by the microcode Read at the source ↗

https://github.com/reenigne/reenigne/blob/master/8088/8086_microcode/8086_microcode.cpp

github.com

https://www.righto.com/2023/02/8086-modrm-addressing.html

righto.com

The Group Decode ROM: The 8086 processor's first step of instruction decoding Read at the source ↗

http://www.mlsite.net/8086/

mlsite.net

https://amzn.to/49JlB8M

amzn.to

https://static.righto.com/images/8086-alu-notes/signal-drive.png

static.righto.com

https://static.righto.com/images/8086-alu-notes/bootstrap-diagram.jpg

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https://www.righto.com/2020/10/how-bootstrap-load-made-historic-intel.html

righto.com