Routines
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CA55: Draw Playing Area Border
Used by the routine at StartGame.
Draws the border around the playing area, in yellow on red.
After DrawPlayingAreaBorder
playing-area-border
Set the colour and the font.
DrawPlayingAreaBorder CA55 LD A,$16 Use yellow ink on red paper (attribute 16), and keep it in AF'.
CA57 EX AF,AF'
CA58 LD HL,$BB0A Set the font to the characters of the border.
CA5B LD ($BBAC),HL
CA5E LD DE,$CAE5 Point at the characters of the border.
Draw the four corners.
CA61 LD HL,$4005 Draw the top left corner at 4005 (in the screen buffer).
CA64 CALL PrintCharacterBlock
CA67 LD HL,$401D Draw the top right corner at 401D (in the screen buffer).
CA6A CALL PrintCharacterBlock
CA6D LD HL,$5005 Draw the bottom left corner at 5005 (in the screen buffer).
CA70 CALL PrintCharacterBlock
CA73 LD HL,$501D Draw the bottom right corner at 501D (in the screen buffer).
CA76 CALL PrintCharacterBlock
Draw the top and bottom edges.
CA79 LD HL,$4007 Draw the top edge, eleven blocks long, at 4007 (in the screen buffer).
CA7C LD B,$0B
CA7E CALL DrawHorizontalEdge
CA81 LD HL,$5007 Draw the bottom edge, eleven blocks long, at 5007 (in the screen buffer).
CA84 LD B,$0B
CA86 CALL DrawHorizontalEdge
Draw the sides.
CA89 INC DE Point at the characters of the sides.
CA8A INC DE
CA8B INC DE
CA8C INC DE
CA8D LD HL,$4045 Draw the left edge, seven blocks long, at 4045 (in the screen buffer).
CA90 LD B,$07
CA92 CALL DrawVerticalEdge
CA95 LD HL,$405D Draw the right edge, seven blocks long, at 405D (in the screen buffer).
CA98 LD B,$07
CA9A JP DrawVerticalEdge
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