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F09D: Draw Colour Border
Draws two sets of four concentric colour rings to build the screen colour border: four rings from the outer edge at (00 00), then four more from the inner edge at (08 08).
Draw_Colour_Border F09D LD BC,$0000 Draw 04 concentric rings from the outer screen edge.
F0A0 LD D,$04
F0A2 CALL Draw_Concentric_Rings
F0A5 LD BC,$0808 Draw 04 concentric rings starting 08 cells inward.
F0A8 LD D,$04
F0AA CALL Draw_Concentric_Rings
F0AD RET Return.
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