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Re:Cardiac: CARDboard Illustrative Aid to Computation (1969) by dang on Monday June 28, 2021 @01:37AM (#27658463)
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

Re:Cardiac: CARDboard Illustrative Aid to Computation (1969) by miles on Monday June 28, 2021 @02:06AM (#27658614)
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

Re:Cardiac: CARDboard Illustrative Aid to Computation (1969) by dang on Monday June 28, 2021 @02:12AM (#27658642)
Thanks! I've added https://news.ycombinator.com/item?id=8348615 to my comment above since it has comments.
Re:Cardiac: CARDboard Illustrative Aid to Computation (1969) by Donckele on Monday June 28, 2021 @02:07AM (#27658615)
The dale miller domain for the link (dang) above is down.