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FCAB: Reload Music Stream Cursor
Used by the routine at Read_MusicStreamByte.
Reload the stream cursor from the word after an end marker, then continue fetching at Read_MusicStreamByte_Fetch.
Reload_MusicStreamCursor FCAB INC HL Advance HL onto the reload word.
FCAC LD E,(HL) Fetch its low byte into E.
FCAD INC HL Advance onto the high byte.
FCAE LD D,(HL) Fetch its high byte into D.
FCAF DEC HL Step HL back onto the cursor word.
FCB0 DEC HL
FCB1 JR Read_MusicStreamByte_Fetch Jump to Read_MusicStreamByte_Fetch to fetch from the reloaded cursor.
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