Muxcard, a DIY credit card size computer

I went to the page expecting to rant about how it's not actually credit card size because of the thickness and was for once pleasantly surprised! Kudos to the author! It looks great!

This post - the title made me remember ... ( as a credit card is about the same size as a business card )

A Linux Business Card CD is a miniature, credit-card-sized optical disc containing a stripped-down, bootable Linux operating system. They hold around 50MB to 100MB of data and were highly popular in the early-to-mid 2000s

More info at https://en.wikipedia.org/wiki/Bootable_business_card

What fun!

I’d love to also go the opposite direction, a full-sized laptop with an ESP32 running tiny386 and Windows 95 ^_^

https://www.hackster.io/news/he-chunhui-s-tiny386-turns-the-...

Developer here :)

Just saw this and love how I got the 100th or so "Does it run DOOM?". Even now officially an issue on GitHub. Does that mean I now have to deliver?

Wow. This is actually credit card sized.

Last week (87 points, 7 comments) https://news.ycombinator.com/item?id=48251528

> A fully working computer that is literally the size of a credit card.

Nit: A (chip) credit card is already a fully working computer :)

Very cool! Love it...

But...

The battery is likely to be squeezed quite a bit after this is put in my wallet, and in my pocket.

Lithium batteries do not like to be squeezed. They tend to signal their distress with some type of heat, usually accompanied with a small fire and probable smoke as well.

A distressed battery is very insistent upon everyone to see it's state of mind...

Hidden in here is the coolest part, that the author made flex PCBs at home

Just in time for DEFCON. We built many of these types of badges

I love these kind of projects. M5Stack Cardputer Zero launched on Kickstarter last week and already hit their goal

https://www.kickstarter.com/projects/m5stack/cardputerzero

> For the first prototype, I soldered each wire individually...

I salute you sir. Did you have a better solution for later versions?

Prologium is depositing thin film solid state batteries onto flexible ceramic insulators. They have some demos of single cells that appear to be thinner than 1mm continuing to operate after bending in half.

https://prologium.com/tech/core-technology/

A credit card with chip is a computer without power.

Can it run DOOM?

Coincidentally, the xteink x4 has the same CPU, an e-paper screen and is close to credit card sized.

I would love if the screen could take up more space, even at the expense of a little extra thickness.

love this. would be cool if we can see and perform all kinds of banking txns on this. Think ledger but all in one card. Super cool. Even cooler would be card to card money transfer without use of swipe machines

It seems like it might be a little expensive for a business card...

How do you recharge it? Do you have to swap the battery?

Try NGK EnerCera for battery.

This is great, and I love it, and I hate to be saying this, but it's not literally the size of a credit card, it's 0.2mm thicker.

Run Unix v6 on it :) 16 bit and works with like 80kb of ram

Do yourself it!

__This__ is where all those trusted app parts should go - a smart card with e-ink display that can provide high security assurance level and where I won't mind that it's locked down because it has only one purpose.

__Not__ to my smartphone, effectively preventing me from modifying the system in the name of security. A banking app can use a card like this and on the display I could for example see where a transaction would go and then I could accept it, possibly even with a biometric identification.

This would enable me to keep my smartphone customizable and banking apps secure at the same time.

[apologies for the rant]

dyi = Do Yourself It?

I want this, but only for one thing: email.

I already use an pwnagotchi, and it works great for this - but its a bit bulky.

If I can get this set up and working, it'll be my main interface to email.

legendary

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It's not a computer.

First thought: cool! Second thought: e-waste

(same reaction as single-serve coffee pods, circa 2023)