Routines
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C531: Handle possible crouch for FOOT MAN
Used by the routines at C3E0 and C4A6.
C531 PUSH AF Save AF
C532 CALL $A375 Set A a pseudo random nummber
C535 CP $80 is less than $80?
C537 JP C,$C54D Jump to crouch FOOT MAN if so
C53A LD (IX+$11),$04 Reset state change counter
C53E POP AF Restore AF
C53F RET
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