Routines
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6877: Scan the keyboard.
Used by the routines at Game_KeyPress, TitlePageDisplay and ScreenSelectSpeed.
Keyboard_Scan 6877 LD HL,$FFFF
687A LD BC,$FEFE
687D IN A,(C)
687F OR $01
Keyboard_Scan_0 6881 OR $E0
6883 LD D,A
6884 CPL
6885 CP $01
6887 SBC A,A
6888 OR B
6889 AND L
688A LD L,A
688B LD A,H
688C AND D
688D LD H,A
688E RLC B
6890 IN A,(C)
6892 JR C,Keyboard_Scan_0
6894 RRA
6895 RL H
6897 RET
6898 NOP
6899 NOP
689A NOP
689B NOP
689C NOP
689D NOP
689E NOP
689F NOP
68A0 NOP
68A1 NOP
68A2 NOP
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