Keyboard: PAUSE2

       Name: PAUSE2                                                  [Show more]
       Type: Subroutine
   Category: Keyboard
    Summary: Wait until a key is pressed, ignoring any existing key press
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * JMTB calls PAUSE2


 Returns:

   X                    The ASCII code of the key that was pressed


.PAUSE2

 JSR RDKEY              ; Scan the keyboard for a key press and return the
                        ; ASCII code of the key pressed in X (or 0 for no key
                        ; press)

 BNE PAUSE2             ; If a key was already being held down when we entered
                        ; this routine, keep looping back up to PAUSE2, until
                        ; the key is released

 JSR RDKEY              ; Any pre-existing key press is now gone, so we can
                        ; start scanning the keyboard again, returning the
                        ; ASCII code of the key pressed in X (or 0 for no key
                        ; press)

 BEQ PAUSE2             ; Keep looping up to PAUSE2 until a key is pressed

.newyearseve

 RTS                    ; Return from the subroutine