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A comment on How a CPU works: Bare metal C on my RISC-V toy CPU. Parent comment

Re:How a CPU works: Bare metal C on my RISC-V toy CPU by Waterluvian on Thursday January 26, 2023 @05:20PM (#34539708)
Is there a version of something like this that’s purely software?

Like, emulate gates and keep building bigger pieces until you have a function that’s a CPU. Etc.

I guess I’m thinking a bit more lower level than an emulator where you implement an opcode using normal capabilities of your language of choice.

I guess TFA is pretty close to this in ways, too.

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Re:How a CPU works: Bare metal C on my RISC-V toy CPU by rowanG077 on Thursday January 26, 2023 @05:26PM (#34539768)
Yeah. There this book which uses Haskell based Clash to build up a simple CPU, a VGA controller and other peripherals.

hardcover:

https://www.lulu.com/shop/gerg%C5%91-%C3%A9rdi/retrocomputin...

or digital:

https://leanpub.com/retroclash/

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Re:How a CPU works: Bare metal C on my RISC-V toy CPU by Waterluvian on Thursday January 26, 2023 @05:26PM (#34539777)
Oh that’s exactly what I was hoping for! Thank you!
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Re:How a CPU works: Bare metal C on my RISC-V toy CPU by NathanWilliams on Thursday January 26, 2023 @07:27PM (#34540883)
I have been building a CPU using: https://github.com/hneemann/Digital

Much faster than Logisim, UI a little clunky, but my CPU runs around 0.5Mhz and it has very nice peripherals like Telnet, graphics ram, VGA etc

Terrible name that is hard to google, but great tool.

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Re:How a CPU works: Bare metal C on my RISC-V toy CPU by sgtnoodle on Thursday January 26, 2023 @10:47PM (#34542213)
In college, we wrote a CPU simulation in C, for a simple architecture called "little computer". You could call it an emulator, but the whole idea was to faithfully implement all the pipelining and register renaming and stuff. A main loop iteration was equivalent to a clock cycle.
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Re:How a CPU works: Bare metal C on my RISC-V toy CPU by rramadass on Thursday January 26, 2023 @11:00PM (#34542282)
The great Niklaus Wirth wrote a book which you might want to check out: Digital Circuit Design for Computer Science Students: An Introductory Textbook.
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Re:How a CPU works: Bare metal C on my RISC-V toy CPU by emoII on Friday January 27, 2023 @02:08AM (#34543463)
Worth a mention: https://turingcomplete.game I've played for a few hours, it's well made!
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