Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

Showing posts with label 8085. Show all posts
Showing posts with label 8085. Show all posts

Down to the silicon: how the Z80's registers are implemented

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The 8-bit Z80 microprocessor is famed for use in many early personal computers such the Osborne 1, TRS-80, and Sinclair ZX Spectrum. The Z80...
21 comments:

The Z-80's 16-bit increment/decrement circuit reverse engineered

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The 8-bit Z-80 processor was very popular in the late 1970s and early 1980s, powering many personal computers such as the Osborne 1, TRS-80,...
13 comments:

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:

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:

Reverse-engineering the 8085's ALU and its hidden registers

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This article describes how the ALU of the 8085 microprocessor works and how it interacts with the rest of the chip, based on reverse-engine...
3 comments:
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