Pluralistic: CARDiac, syntax coloring, view source and vibe code (03 Jul 2026) – Pluralistic: Daily links from Cory Doctorow

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CARDiac, syntax coloring, view source and vibe code: With great abstraction comes great power comes great responsibility comes great loss of fidelity.

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CARDiac, syntax coloring, view source and vibe code (permalink)

In the mid-1970s, my dad – then a budding computer scientist, subsequently a math teacher – brought home my first computer: the CARDiac, a Turing-complete, all-cardboard papercraft computer that you could write and execute programs on:

https://en.wikipedia.org/wiki/CARDboard_Illustrative_Aid_to_Computation

CARDiac stands for "CARDboard Illustrative Aid to Computation," and it was created in 1968 at Bell Labs as a way to teach high schoolers how computers worked. I wasn't anywhere near high school age (I think I was in third grade?) but the CARDiac was revelatory. The year before, I'd had access to a teletype terminal and acoustic coupler that let me operate a PDP machine at the University of Toronto, and I'd been endlessly fascinated with the possibilities. I wrote simple BASIC programs, chatted with ELIZA, and messaged other system users, one keystroke at a time, all on paper (the terminal didn't have a screen, just a printer, and we fed it 1,000' rolls of paper towels my mom brought home from her kindergarten classroom, which I then rolled back up so she could put them back in the bathroom for the kids to dry their hands on).

Interacting with a computer in real-time was captivating, but it wasn't until I assembled and used the CARDiac that it all snapped into place. With the CARDiac, you composed simple programs with pencil and paper, then followed instructions that directed you to move paper tokens in and out of various slots representing memory cells and an accumulator. All an electronic computer does is repeat these crude mechanical operations, millions of times per second, using microscopic transistors. None of that action can be observed with the naked eye, of course. If you had a very sensitive multimeter and a very good microscope, it's conceivable that you could indirectly watch this intricate dance, but only on very early processors, and only if you drastically slowed down their operations.

Much later, I learned a word for what I got from the CARDiac: legibility. Together, the CARDiac and I made a working digital computer, with me standing in for the physics that propels electrons down the endless labyrinth of a microchip, like a pinball triggering various blooping, beeping bumpers. Though the computing we performed was sub-trivial (adding one and one was a major undertaking!), the physical performance of that computing imbued me with Fingerspitzengefühl ("fingertip feeling"):

https://en.wikipedia.org/wiki/Fingerspitzengef%C3%BChl

This stood me in great stead in the years to come. To this day, when I think about my computer, I sometimes imagine those little cardboard tokens, shuffling in and out of the slits in my paper CARDiac. There's something very reassuring about this imagery. No matter how many levels of abstraction sit between me and the nanoscale transistors ranked in their billions beneath my fingertips, they are all undertaking those familiar operations I painstakingly performed on my child's desk all those years ago.

(This is one of the things that makes Science Comics Computers: How Digital Hardware Works such an amazing kids' book! By illustrating how a computer's operations are built up from simple boolean logic that can be represented as physical switches, the comic performs that same legibilizing magic that I got from the CARDiac:)

https://pluralistic.net/2025/11/05/xor-xand-xnor-nand-nor/#brawniac

Not long after my CARDiac experience, my dad brought home an Apple ][+, which came with a schematic that revealed the inner workings of the machine in ways that I found visually striking, if significantly less accessible than the CARDiac:

https://downloads.reactivemicro.com/Apple%20II%20Items/Hardware/II_&_II+/Schematic/Apple%20II%20Schematics.pdf

(For me, at least. For the legendary hardware hacker Andrew "bunnie" Huang, it was the start of a journey that turned him into one of the world's virtuoso reverse-engineers and science communicators):

https://pluralistic.net/2026/01/09/quantity-break/#so-many-chips

The Apple ][+ did very little when you took it out of the box. It came with a few...