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B072: Get the LSB of the message address for a main character's name
Used by the routine at B0E8. Returns with the LSB in L.
B 1-8 (corresponding to one of the eight main characters)
B072 LD A,$08 C=8-B
B074 SUB B
B075 LD C,A
B076 ADD A,A A=8*(8-B)
B077 ADD A,A
B078 ADD A,A
B079 SUB C A=7*(8-B)
B07A ADD A,A A=14*(8-B)
B07B ADD A,$80 A=128+14*(8-B)
B07D LD L,A Place this LSB in L
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