I'm looking at a subroutine and trying to figure out the logic behind it. (coldfire processor)
It's supposed to accept an input character from a user and then call on another subroutine to print it to the console.
The character is saved to the lower byte of a certain register D.
However before D is sent to the subroutine that prints it, it is first logic anded with 7F. I dont understand why though?