Utility routines: DELAY

       Name: DELAY                                                   [Show more]
       Type: Subroutine
   Category: Utility routines
    Summary: Wait for a specified time, in either 1/50s of a second (on PAL
             systems) or 1/60s of a second (on NTSC systems)
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * BRIS calls DELAY
             * DKS3 calls DELAY
             * dn2 calls DELAY
             * DOENTRY calls DELAY
             * HYPNOISE calls DELAY
             * Main game loop (Part 5 of 6) calls DELAY
             * MT26 calls DELAY
             * TT217 calls DELAY


 Wait for the number of vertical syncs given in Y, so this effectively waits
 for Y/50 of a second on PAL systems (as the PAL vertical sync occurs 50 times
 a second) or Y/60 of a second on NTSC systems (as the NTSC vertical sync
 occurs 60 times a second).


 Arguments:

   Y                    The number of vertical sync events to wait for


.DELAY

 JSR WSCAN              ; Call WSCAN to wait for the vertical sync, so the whole
                        ; screen gets drawn

 DEY                    ; Decrement the counter in Y

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

 RTS                    ; Return from the subroutine