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B4AE: Basic beep for menu key press.
Used by the routines at Game_InputSetKeys and MainMenu.
Input
Output
Beep_BasicKey B4AE PUSH AF
B4AF PUSH HL
B4B0 PUSH BC
B4B1 PUSH DE
B4B2 LD B,$C8
B4B4 LD C,$32
Beep_BasicKey_0 B4B6 LD A,$00
B4B8 OUT ($FE),A
B4BA PUSH BC
Beep_BasicKey_1 B4BB DJNZ Beep_BasicKey_1
B4BD POP BC
B4BE LD A,$10
B4C0 OUT ($FE),A
B4C2 PUSH BC
Beep_BasicKey_2 B4C3 DJNZ Beep_BasicKey_2
B4C5 POP BC
B4C6 DEC C
B4C7 JR NZ,Beep_BasicKey_0
B4C9 POP DE
B4CA POP BC
B4CB POP HL
B4CC POP AF
B4CD RET
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