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0292: decode_magazine_number: Get the magazine number from the Magazine Row Address Group.
Used by the routine at NMI_ISR.
decode_magazine_number 0292 CALL hamming_decode_hl Hamming 8/4 decode the byte at address in HL.
0295 LD A,B Return if result is $FF.
0296 CP $FF
0298 RET Z
0299 AND $07 Else return magazine number in B.
029B LD B,A
029C RET
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