Reverse Engineering of ALU of Microprocessor 8085 : Surprisingly Complex.

Abhishek Rawal · 2013-02-02T23:48:07+00:00

I just found a very interesting stuff from Ken Shirrif's blog on Reverse Engineering of Arithmetic Logic Unit Microprocessor 8085. To anyone who wants to read the full detail on how the ALU really works & to people who like to play on with gates,take a look on : <a href="https://www.righto.com/2013/01/inside-alu-of-8085-microprocessor.html" target="_blank" rel="nofollow noopener noreferrer">Inside the ALU of the 8085 microprocessor</a> This dude has very interesting blog 👍

Reverse Engineering of ALU of Microprocessor 8085 : Surprisingly Complex.

Abhishek Rawal
@abhishek-fg9tRh

Updated: Feb 2, 2013

Views: 1.2K

I just found a very interesting stuff from Ken Shirrif's blog on Reverse Engineering of Arithmetic Logic Unit Microprocessor 8085.

To anyone who wants to read the full detail on how the ALU really works & to people who like to play on with gates,take a look on : <a href="https://www.righto.com/2013/01/inside-alu-of-8085-microprocessor.html" target="_blank" rel="nofollow noopener noreferrer">Inside the ALU of the 8085 microprocessor</a>

This dude has very interesting blog 👍

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arunchary

Member • Feb 13, 2013

awesome engineering, good stuff Troll its really help for me to teach in my internship thanks for you kind information..

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Abhishek Rawal

Member • Feb 16, 2013

arunchary
awesome engineering, good stuff Troll its really help for me to teach in my internship thanks for you kind information..
You would love to read this too <a href="https://www.righto.com/2013/02/looking-at-silicon-to-understanding.html" target="_blank" rel="nofollow noopener noreferrer">Silicon reverse engineering: The 8085's undocumented flags</a>
Undocumented Flags V & K of 8085 explained !

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Abhishek Rawal

Member • Feb 24, 2013

How 8085 Microprocessor decodes instructions internally ?

The set of PLAs are used to decode the instruction.
Arrangement of PLA in the chip is shown in figure given below :

The instruction ROM decodes into 48 other instruction groups.
Check this image :

Image from Ken Shirrif's blog.

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