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$B57F#check for stairs (proper)#

$B5F4#.. null stair#

$B5AA#.. scale up to pix coords#

$B5B2#.. check if yint equals that#

$B5BD#.. compare xint#

$B59A#.. start of loop#

$BF55#.. return false#

$BF57#.. return true#

$BF5C#check diagonal for stairs#

$BF58#BEQ $BF57#

$BFCA#.. increase y#

$BFD4#.. adjust x#

$BFED#.. decrease x#

$BF85#.. start of outer loop#

$BF59#check diagonal for stairs#

$BF87#.. start of inner loop#

$BFB2#continue +++#

$BFB3#continue ++#

$BFB4#continue +#

$BFB7#adjust xy#