Prints Pi on a CRT, one hexadecimal digit at a time, with a Rasperry Pi and Python.

Pi in hex uses BBP algorithm implementation in Python from https://literateprograms.org/pi_with_the_bbp_formula__python_.html

• Edit kernel boot line settings to enable RCA output as described in references
• raspi-config for overscan/underscan, pixel doubling; used default size 720
• sudo apt install mg python3 gmp-devel sysvbanner && pip install gmp
• mkdir -p ~/bin && cp play*.sh ~/bin/ && chmod a+x ~/bin/play*.sh
• export EDITOR=mg; crontab -e # add "@reboot /home/pi/bin/play.sh" to end
• sudo reboot

• See also the same idea using a Seeduino and Adafruit video library https://github.com/wa5znu/scavox-crt

• Banner https://unixgeeks.org/security/newbie/unix/man9/banner.html sysvbanner
• Analog Video Out https://mlagerberg.gitbooks.io/raspberry-pi/content/3.5-analog-video-output.html
• RPi Video Out (works fine on my 3B) https://raspberrypi.stackexchange.com/questions/69884/raspberry-pi-3-model-b-v1-2-connect-to-old-tv-via-composite-video-output
• More RPi Video Out https://magpi.raspberrypi.com/articles/rca-pi-zero
• More BBP https://www.experimentalmath.info/bbp-codes/
• More BBP https://en.wikipedia.org/wiki/Bailey%E2%80%93Borwein%E2%80%93Plouffe_formula
• Adafruit RPi video cable https://www.adafruit.com/product/2881
• RCA to pin adapter https://www.amazon.com/gp/product/B07FQ8RLQZ
• Sony CRT https://geeseang.wordpress.com/experiment-with-sony-flat-4inch-crt/