Mastodawn

My IR tests to better understand how remote controls encode the commands. https://blog.jaxtax.eu/ir-deep-er-dive/

IR Deep(er)dive

Now I have a working CL9 Core Universal Remote and an oscilloscope. My next idea was to understand how IR codes are stored in the CL9 so I could program new IR codes for remotes that I no longer have or that are damaged. To start with something simple, I

Jaxtax Tech Blog

jax̌tax̌4d ago

A small but surprisingly powerful device that can read, copy, and emulate many RFID identification cards. I wrote a short hands-on article about the Chameleon Ultra here: https://blog.jaxtax.eu/chamaleon-ultra-rfid/

Chamaleon Ultra RFID

ID cards - how many do I have? Too many. An official ID card, a health insurance card, a garage access card, an office card, and a card for building entry. Plus my sons’ ISIC cards. And sometimes one of us has no clue where a particular card is when

Jaxtax Tech Blog

jax̌tax̌May 16

Now I can see what was hidden to me. Oscilloscope to every home. https://blog.jaxtax.eu/oscilloscope-to-every-home/

jax̌tax̌May 15

After years of running WordPress, I decided to try something new and moved my blog to Ghost at blog.jaxtax.eu. Hopefully this fresh start will also mean more time and care dedicated to the content than in the past.

jax̌tax̌May 8

Alive again: the Core CL9 Universal Remote. Powered by a 6502 CPU.
Looking for the schematic or firmware source code like I was? Check out Wozniak’s patent for this!

jax̌tax̌May 6

The new PIL-Box returned my HP-IL module for HP-41CX back to life! Now with USB-C and smaller form-factor.

jax̌tax̌Apr 27

I need to fix my CL9 Core universal remote… so I bought a Rigol MHO984 😄
Time to make the CL9 great again!

jax̌tax̌Apr 24

I need to repair CL9 Core universal remote. So I bought Rigol MHO984. Let's make CL9 great again!

jax̌tax̌Apr 3

Found a CL9 Core Universal Remote on eBay sold as “not working” - but I had a hunch it was just lost firmware (it lives in RAM 🙂). Turns out I was right: brought it back to life by replacing the soldered backup battery and reloading the firmware via a USB-UART adapter using my own golang-based tool.

jax̌tax̌Feb 14

Bought as non-working - and now it runs again! An absolute top-tier calculator from 1977, powered by a mighty 1 kB of memory. Still impressive nearly 50 years later.