Routines
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A990: Routine at A990
Used by the routines at A5CD, A92F and B77F.
A990 PUSH DE
A991 LD D,(HL)
A992 INC HL
A993 LD E,(HL)
A994 DEC HL
A995 LD A,C
A996 AND A
A997 JR Z,$A9A0
A999 SLA E
A99B RL D
A99D DEC A
A99E JR NZ,$A999
A9A0 LD A,C
A9A1 ADD A,$05
A9A3 CP $08
A9A5 JR C,$A9AA
A9A7 SUB $08
A9A9 INC HL
A9AA LD C,A
A9AB LD A,D
A9AC POP DE
A9AD RRCA
A9AE RRCA
A9AF RRCA
A9B0 AND $1F
A9B2 ADD A,$60
A9B4 RET
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