Sherlock: Routine at 62757

62757: Attribute Down

Used by the routine at Drawing. Moves the attribute address one row down. A high byte of 90 means the step passed the end of the attribute file.
AttributeDown	62757	PUSH AF	Keep the colour and step the attribute address down one row.
	62758	PUSH DE
	62759	LD DE,32
	62762	ADD HL,DE
	62763	LD A,H	Leave the new row in place when it is still on screen, and fall through when it is not.
	62764	CP 90
	62766	JR NZ,62770
	62768	AND A	Clear the carry before the row is stepped back.
	62769	SBC HL,DE	Step back one row (32) because the step left the attribute file.
	62771	POP DE	Restore the pen and the colour from the stack.
	62772	POP AF	Restore the pen and the colour from the stack.
	62773	RET	Return.
View the equivalent code in; The Hobbit