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1F28: Routine at 1F28
Used by the routines at OELRoutine08 and OELRoutine09.
1F28 CALL OELRoutine19
1F2B CP $03
1F2D JP NC,illegal_operand
1F30 CP $01
1F32 JR Z,$1F40
1F34 JP C,illegal_operand
1F37 CALL OELRoutine17
1F3A CALL hex_to_int
1F3D PUSH AF
1F3E JR $1F42
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