Drawing circles: LL164

       Name: LL164                                                   [Show more]
       Type: Subroutine
   Category: Drawing circles
    Summary: Make the hyperspace sound and draw the hyperspace tunnel
    Context: See this subroutine in context in the source code
 Variations: See code variations for this subroutine in the different versions
 References: This subroutine is called as follows:
             * TT18 calls LL164


.LL164

 LDA #56                \ Call the NOISE routine with A = 56 to make the sound
 JSR NOISE              \ of the hyperspace drive being engaged

 LDA #1                 \ Set HFX to 1. In the other versions, this makes the
 STA HFX                \ hyperspace rings multi-coloured, but the Electron
                        \ version is monochrome, so this has no effect

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

 JSR HFS2               \ Call HFS2 to draw the hyperspace tunnel rings

 DEC HFX                \ Set HFX back to 0, which has no effect in the Electron
                        \ version

 RTS                    \ Return from the subroutine