A single addition to a 6 bit character NES password system is interesting enough for me to dig into and understand better. I also discover I messed up a diagram in the last video and corrected it here. Oops!

Thanks to @ijimkoz and others for their feedback in production!

Note: The project name and URL have changed! Go to theindustriousrabbit.com to learn more!

References

• Password decoding guide and an app you can use to verify that substitutions work (http://games.technoplaza.net/mpg/)

• List of Metroid passwords (https://metroid.fandom.com/wiki/List_of_Metroid_passwords)

Code

• NES Password ROM you see at the end (https://code.hackerbun.dev/TheIndustriousRabbit/nes-password-rom)
• See the ROM in action (https://theindustriousrabbit.com/blog/2021-07-15-nes-text-passwords-demo-nes-rom/)
• Secret note system generator (https://code.hackerbun.dev/TheIndustriousRabbit/secret-note-system-generator)

Music

• Chipper Doodle - Kevin MacLeod (https://incompetech.com/music/royalty-free/?keywords=Chipper+doodle) - CC-BY 3.0