Drawing circles: LAUN

       Name: LAUN                                                    [Show more]
       Type: Subroutine
   Category: Drawing circles
    Summary: Make the launch sound and draw the launch tunnel
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DOENTRY calls LAUN
             * TT110 calls LAUN


 This is shown when launching from or docking with the space station.


.LAUN

 LDY #0                 ; Call the SOHISS routine twice with Y = 0 to make the
 JSR SOHISS             ; sound of the ship launching from the station
 JSR SOHISS

 LDA #8                 ; Set the step size for the launch tunnel rings to 8, so
                        ; there are fewer sections in the rings and they are
                        ; quite polygonal (compared to the step size of 4 used
                        ; in the much rounder hyperspace rings)

                        ; Fall through into HFS2 to draw the launch tunnel rings