macOS 26 Tahoe, version number changed from 16 to 26 to indicate the year 2026(?). There are quite a number of criticisms about the new macOS with Liquid Glass display.
macOS 26, Windows Vista Moment, the title says it all.
From this graph, some users seem to revert back to version 15.7 from version 26.
Better don't spend too much time on this.
Most people, especially those old school electronic guys/gals think that Arduino is just for hobbyists. They are not wrong but Arduino can do more than that.
When I talk to some people, they tell me that cost of the microprocessor is nothing important compare with the development cost. In that case, Arduino is not just for hobbyists, it can prototype product quickly.
Qualcomm bought over Arduino (for undisclosed amount), which means Qualcomm sees some value in Arduino. For me the value of Arduino is the community and the platform (includes the software library). Arduino has easy to use API.
Seems like Qualcomm wants to make use of Arduino UNO Q for AI.
Raspberry Pi started with a card size PC board and expanded into bare metal microprocessor systems like RPi zero, pico etc. Arduino moved from microprocessor to UNO Q with Linux OS, interesting.
$ docker run hello-world
$ ps -A | grep dockerd
=> dockerd
$ docker run busybox echo "hello world"
$ docker run -it busybox echo /bin/sh
# -p <host>:<container> portmap eg. -p 8080:8080
# -v, map volume
# check container
$ docker container ps -a
$ docker stop <container id>
# remove all container
$ docker container prune
$ docker image ls
$ docker image ls -q # quiet, id only
$ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
busybox latest 0ed463b26dae 11 months ago 4.43MB
$ docker rmi busybox:latest # OR
$ docker rmi <image id>
$ docker rmi $(docker image ls -q)
Note: remove previous version before install
$ sudo systemctl stop docker
$ dpkg -l | grep "docker\|containerd.io"
Install
$ curl -fsSL test.docker.com -o get-docker.sh && sh get-docker.sh
$ brew install colima ## need lima, qemu etc.
$ brew install docker docker-compose
## OR
$ brew install colima docker lima-additional-guestagents
$ colima start | stop [default]
I just received the Raspberry Pi Pico 2 this morning, after a long weekend. I was occupied today and unable to test it after I received it.
The Raspberry Pi Pico is small, slightly smaller that what I was expecting.
It suppose to be easy to install with Micropython. Plug in the power/USB with Bootsel button pressed, the Pico will appeared as an USB drive, just copy the Micropython UF2 file to the Pico(drive) and reboot.
This is a quick and dirty tutorial for Docker
Docker is a container, a lightweight vm to run linux os environment. It use lesser (much lesser) resource than Virtualbox. Docker can be used for development and production, it provide consistant environment, and more secure.
Docker can run on Linux, macOS (Docker Desktop) and Windows (WSL2).
So far using the script is easiest, it even works on Chrome OS constini vm. Before install using the script, remove the previous version as advised.
# eg. for debian, check for dpkg -l | grep "docker\|container.io", remove those softwares
$ curl -fsSL test.docker.com -o get-docker.sh && sh get-docker.sh
I use colima (+lima +qemu), as a replacement of Docker Dekstop for macOS.
$ brew install colima
$ colima start # it may takes some time to start colima
To test docker is working:
$ docker run hello-world
=>Hello from Docker!
Note: You may need root/sudo to run.
Docker image is a pre-build image ready to be run, it can be downloaded from docker hub, modified and update back to the docker hub. A container is a running vm base on the docker image.
# docker pull image:tag
$ docker pull busybox:latest
$ docker run busybox:latest
# OR
$ docker run busybox # if will add the tag:latest and download from docker hub
=> (nothing)
Nothing shown because this image doesn't output any message by default.
$ docker run busybox echo Hello, world
=> Hello, world
Image name and tag can be found on hub.docker.com.
$ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
busybox latest 0ed463b26dae 11 months ago 4.43MB
You can remove the image by:
# docker rmi image_id/image_name
$ docker rmi 0ed463b26dae
=> unable to remove repository ... container 347423e07780 is using
It is ok you can not delete the image, as container is using it.
$ docker run -it busybox /bin/sh # -it, interactive tty??
busybox# echo "hello, world" >/hello
busybox# exit
# if you run the command again, cant find the file /hello.txt
$ docker run -it busybox ls /hello.txt
ls: /hello: No such file or directory
That is because every time you execute the command it created a new container. The file still exist in the earlier container.
$ docker container ps -a
ea9066a4d753 busybox "ls /hello" ... tender_shaw
86d9045d5cab busybox "/bin/sh" ... kind_maxwell
The container has a unique id and a unique random name. The file hello is at the container kind_maxwell. Since the status is Exited, need to start the container to access the file again.
$ docker container start kind_maxwell # OR simply docker start kind_maxwell
$ docker exec kind_maxwell cat /hello.txt
hello, world
$ docker container ps -a
You can delete one by one, or delete all.
$ docker container prune
# stop container
$ docker [container] stop id
Now you can delete the image:
$ docker rmi busybox
...
# delete all
$ docker rmi $(docker image ls -q) # -q, quiet, just list the image id
$ docker run --name kind_maxwell busybox
Unable to find image 'busybox:latest' locally
latest: Pulling from library/busybox
$ docker ps -a | grep kind_maxwell
ee044ad46bf2 busybox:latest Exited (0) kind_maxwell
Basically J2ME/PhoneMe is dead, like J2EE, but worst. Just sharing, because I am a strong supporter of Java...
Yesterday I found a J2ME vm which can run on Raspberry Pi Pico (a very small microcontroller). This guy name Oren Sokoler, I think just he himself alone ported the PhoneMe to Pico, name pico-jvm (https://github.com/orenskl/pico-jvm), not completed, but seems like hello world is working. Not working for production yet, good for research.
Sun microsystem open source Java before Sun acquired by Oracle, that is a right move, or else Java could be half dead now. There are many Java VM/JDK by other companies including Microsoft and Amazon, I believe all based on the OpenJDK from Sun.
Sun open source their OS Solaris as well, but not so pupular as Linux. Is not easy to write an OS kernel or VM as an open source project. A good example is GNU Hurd kenel, everything is ready just without a working kernel.
Another example is ELKS (Linux on 16 bits 8086), even though is still on going, but not ready for production yet. It doesn't attract enoutgh developers to join as compare to Linux.
I just hope pico-jvm can be continued until becomes a beta product or even further.
Just my immagination, may be in the future. Docker can run Opensolaris, Darwin and Windows container. So far the most stable is still Linux.
No luck in getting Darwin or OpenSolaris running on VM, Qemu or virtualbox. The one which is working is ReactOS (Windows NT).
Since docker works with colima + Qemu, in future may be can use Colima to choose Darwin, OpenSolaris, or Windows (using ReactOS component) as a base.
Darwin is the open source of OS X kernel without the GUI, the XNU hybrid kernel plus BSD software.
I like homebrew so much, that I try it out immediately when I knew about it. At that time, Linux brew is not so matured, I encounter a lot of issues, I didn't know much about ruby program, so I give up.
Now Linux brew is quite matured. It install on Linux without much problem.
There was one time, I was in doubt, why do I need a Linux brew. My Linux can installed a lot of open source packages. This is different from macOS, which doesn’t have a good channel to install those software.
Later I found out that I need it for development. Since homebrew install the software and library in a separated directory, I can create a different development environment apart from the system.
For example, the Java on my system now is mainly Java 17 or above, but I wanted to have Java 8 for developemnt.
This is how I do it, after setup Linux brew:
This even works on Chromebook on ARM chips.
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