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Commands:

• cat /proc/cpuinfo (show model info but somewhat encoded)
• gpio -v gives concise model info
• display 32-bit arch / 64-bit

1. uname -m
2. dpkg-architecture --query DEB_HOST_ACRH (see https://pimylifeup.com/raspberry-pi-os-check-32-bit-64-bit)

Update Raspberry Pi

• sudo apt update
• sudo apt install

GPIO (https://www.circuits.dk/everything-about-raspberry-gpio/) [GPIO pins revert to input upon reset]

• pinout - shows GPIO pin definitions, cpu info, memory, and other information
• gpio readall (see man page gpio) name | wPi -> wiring Pi (historical) | **BCM -> Broadcom SOC channel
• raspi-gpio help

1. level
2. fsel 0-7 ->  (IN, OUT, ALT5, ALT4, ALT0, ALT1, ALT2, ALT3)
3. alt
4. func

External HDMI adjustments

hdmi_force_hotplug=1
hdmi_drive=1
hdmi_mode=16
disable_overscan=1