Routines
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AB9E: Clear the screen
Used by the routines at A410, A4C8, A6FE and AA49.
AB9E LD HL,$5AFF
ABA1 LD BC,$1B00
ABA4 LD (HL),$00
ABA6 DEC BC
ABA7 DEC HL
ABA8 LD A,C
ABA9 OR B
ABAA JR NZ,$ABA4
ABAC RET
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