[dang]

One past thread:

CARDIAC simulator in JavaScript - https://news.ycombinator.com/item?id=8348615 - Sept 2014 (5 comments - thanks miles)

CARDIAC Cardboard Computer Emulator - https://news.ycombinator.com/item?id=641032 - June 2009 (5 comments)

Tangentially related:

PAPAC-00, a Do-It-Yourself Paper Computer (1958) - https://news.ycombinator.com/item?id=15026101 - Aug 2017 (12 comments)

I think there have been others...anyone?

Edit: A fun comment from a different thread (Aug 2012):

https://news.ycombinator.com/item?id=4416054

[miles]

Here's all I could find:

CARDIAC simulator in JavaScript (2014) https://news.ycombinator.com/item?id=8348615

CARDIAC (2014) https://news.ycombinator.com/item?id=8439443

Cardiac – A cardboard illustrative aid to computation (Bell Labs 1968) (2018) https://news.ycombinator.com/item?id=18433504

Cardiac: Portable cardboard computer (2016) https://news.ycombinator.com/item?id=12949393

[dang]

Thanks! I've added https://news.ycombinator.com/item?id=8348615 to my comment above since it has comments.

[Donckele]

The dale miller domain for the link (dang) above is down.