Today marks hitting some new material on the quest to learn asm. I vaguely recall dealing with sign and zero extension before, at least conceptually, but I don’t recall having learned the instructions for these concepts.

cbw (); Converts the byte in al to a word in ax via sign extension
cwd (); Converts the word in ax to a double word in dx:ax
cdq (); Converts the double word in eax to the quad word in edx:eax
cwde(); Converts the word in ax to a double word in eax

signExtension.hla