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C13E: Routine at C13E
Used by the routines at BD0D and C023.
C13E LD H,(IX+$06) H=*IX+06.
C141 LD L,(IX+$05) L=*IX+05.
This entry point is used by the routines at B1D7, B724 and BB73.
C144 ADD HL,HL HL*=02.
C145 LD A,$07 A=07.
C147 AND H Merge the bits from H.
C148 OR %01110000 Set bits 4-6.
C14A LD H,A H=A.
C14B RET Return.
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