Showing posts with label 6502. Show all posts
Showing posts with label 6502. Show all posts

The Z-80 has a 4-bit ALU. Here's how it works.

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The 8-bit Z-80 processor is famed for use in many early personal computers such the Osborne 1, TRS-80, and Sinclair ZX Spectrum, and it is s...
23 comments:

Intel x86 documentation has more pages than the 6502 has transistors

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Microprocessors have become immensely more complex thanks to Moore's Law, but one thing that has been lost is the ability to fully under...
5 comments:

Reverse-engineering the Z-80: the silicon for two interesting gates explained

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I've been reverse-engineering the Z-80 processor, using images from the Visual 6502 team. One interesting thing about the Z-80's s...
4 comments:

Reverse-engineering the 8085's decimal adjust circuitry

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In this post I reverse-engineer and describe the simple decimal adjust circuit in the 8085 microprocessor. Binary-coded decimal arithmetic ...
2 comments:

The 8085's register file reverse engineered

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On the surface, a microprocessor's registers seem like simple storage, but not in the 8085 microprocessor. Reverse-engineering the 8085...
13 comments:

Silicon reverse engineering: The 8085's undocumented flags

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The 8085 microprocessor has two undocumented status flags: V and K. These flags can be reverse-engineered by looking at the silicon of the ...
7 comments:

Inside the ALU of the 8085 microprocessor

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The arithmetic-logic unit is a fundamental part of any computer, performing addition, subtraction, and logic operations, but how it works i...
12 comments: