Keyboard: DKS4

       Name: DKS4                                                    [Show more]
       Type: Subroutine
   Category: Keyboard
    Summary: Scan the keyboard to see if a specific key is being pressed
  Deep dive: The key logger
    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file


 Arguments:

   X                    The internal number of the key to check


 Returns:

   A                   $FF if the key is being pressed, 0 otherwise

   X                    Contains the same as A


.DKS4

 LDA KEYLOOK,X          ; Fetch the entry from the key logger for the key in X

 TAX                    ; Copy A to X

 RTS                    ; Return from the subroutine