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ZX Spectrum on FPGA using A-Z80 CPU
In the last article, I presented a different way of architecturally modeling a Zilog Z80 processor. It is time to do something really useful with it and what could be better than reliving the past for...
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The A-Z80 CPU
This article contains a brief overview and a background of the A-Z80 CPU created for FPGA boards and a ZX Spectrum implementation tied to it. (You can find the Russian translation of this article...
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ZX Spectrum ROM mods
In this blog, I will show you how to interface an Atari-style joystick to the Altera DE1 FPGA board running a Spectrum implementation, how to change the ROM to enable you to input some game-cheat...
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This blog post describes the various tools that I use for both work and hobby projects, on my development PC. Most people already have their own go-to tools installed on each computer they use for...
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Z80 Explorer
Z80 Explorer is a Zilog Z80 netlist-level simulator capable of running Z80 machine code and also an educational tool with features that help reverse engineer and understand this chip better. Z80...
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A Calculator
The idea for this project came about during a week of freezing winter arctic events here in Austin, Texas, with a failed power grid (as well as the Texas government), while keeping close to a gas...
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A Calculator (2): Basic Four Functions
This is the second article in a series on making our calculator. This article is about prototyping and the verification of fundamental algorithms. We need to investigate and pick algorithms we will...
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A Calculator (3): Practical Numerical Methods
In the last post, we verified and quantified the precision of the basic four functions (addition, subtraction, multiplication, and division). Now, we can use them as a stepping stone for more complex...
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A Calculator (4): The Framework
For as long as I remember, I had played with LEGOs. Those simple blocks would transform into complex objects whose final shapes only existed in the supple thoughts of creative imagination. The kind of...
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A Calculator – Completed!
It has been a while since I wrote the last post on this project. In the meantime, I could dedicate all my limited free time to work on the implementation. It took a long time, but I did make...
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