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6752: Ring the bell
Used by the routine at 66E6.
Input
L 0xF9
6752 DI Disable interrupts
6753 LD H,$11 HL=11F9 (duration parameter)
6755 LD D,H D=0x11 (blue border)
6756 LD A,D Make the bell sound
6757 OUT ($FE),A
6759 XOR $10
675B LD D,A
675C LD B,$80
675E DJNZ $675E
6760 DEC HL
6761 LD A,H
6762 OR L
6763 JR NZ,$6756
6765 EI Re-enable interrupts before returning
6766 RET
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