Routines
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6FD3: Clear the screen: white border, black on white
Used by the routine at START.
CLEAR_SCREEN 6FD3 PUSH HL
6FD4 PUSH DE
6FD5 PUSH BC
6FD6 LD A,$07
6FD8 OUT ($FE),A
6FDA LD HL,$4000
6FDD LD DE,$4001
6FE0 LD BC,$1800
6FE3 LD (HL),$00
6FE5 LDIR
6FE7 LD BC,$0300
6FEA LD (HL),$38
6FEC LDIR
6FEE POP BC
6FEF POP DE
6FF0 POP HL
6FF1 RET
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