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Elite on the BBC Micro

Drawing circles: LL164 (Electron version)

Name: LL164 [View in context] Type: Subroutine [Compare versions] Category: Drawing circles Summary: Make the hyperspace sound and draw the hyperspace tunnel
See the IRQ1 routine for details on the multi-coloured effect that's used.
.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