Routines
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6FD3: Clear Screen
Used by the routine at SquiggleLine.
ClearScreen 6FD3 PUSH HL Push HL, DE and BC onto the stack.
6FD4 PUSH DE
6FD5 PUSH BC
6FD6 LD A,$07 Set the border colour to white.
6FD8 OUT ($FE),A
6FDA LD HL,$4000 Write $00 to $1800 memory locations (clearing the screen buffer).
6FDD LD DE,$4001
6FE0 LD BC,$1800
6FE3 LD (HL),$00
6FE5 LDIR
6FE7 LD BC,$0300 Write $38 to the following $300 memory locations (the attribute buffer).
6FEA LD (HL),$38
6FEC LDIR
6FEE POP BC Pop HL, DE and BC from the stack.
6FEF POP DE
6FF0 POP HL
6FF1 RET Return.
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