[Waterluvian]

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.

[NathanWilliams]

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.

[rowanG077]

Yeah. There this book which uses Haskell based Clash to build up simple CPUs, a VGA controller and other peripherals.

hardcover:

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

or digital:

https://leanpub.com/retroclash/

[Waterluvian]

Oh that’s exactly what I was hoping for! Thank you!

[rramadass]

The great Niklaus Wirth wrote a book which you might want to check out: Digital Circuit Design for Computer Science Students: An Introductory Textbook.

[sgtnoodle]

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.

[emoII]

Worth a mention: https://turingcomplete.game I've played for a few hours, it's well made!