Utility routines: DELAY

       Name: DELAY                                                   [Show more]
       Type: Subroutine
   Category: Utility routines
    Summary: Wait until a specified number of NMI interrupts have passed (i.e.
             a specified number of VBlanks)
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * BRIS calls DELAY
             * BRIS_b0 calls DELAY
             * ChangeLetter calls DELAY
             * DOENTRY calls DELAY
             * eq calls DELAY
             * EQSHP calls DELAY
             * LAUN calls DELAY
             * Main game loop (Part 5 of 6) calls DELAY
             * PauseGame calls DELAY
             * SetupDemoUniverse calls DELAY
             * YESNO calls DELAY



 Arguments:

   Y                    The number of NMI interrupts to wait for


.DELAY

 JSR WaitForNMI         ; Wait until the next NMI interrupt has passed (i.e. the
                        ; next VBlank)

 DEY                    ; Decrement the counter in Y

 BNE DELAY              ; If Y isn't yet at zero, jump back to DELAY to wait
                        ; for another NMI interrupt

 RTS                    ; Return from the subroutine