Specifically I'm questioning this bit: > Pressing CTRL simply sets all bits but the last 5 to zero in the character that you typed. You can imagine it as a bit

Specifically I'm questioning this bit: > Pressing CTRL simply sets all bits but the last 5 to zero in the character that you typed. You can imagine it as a bitwise AND. If that were the case then CTRL-(any column) would result in the first column. Edit: I suppose at this point terminal emulators are just hardcoding in CTRL modifiers rather than the truly emulating what a hardware terminal would have done.