Bubbler: Routine at C9C9

C9C9: Shift View Left Byte

Shifts the screen buffer to the left by one byte, by using the stack pointer to copy it. The part from ShiftViewLeftByte_Copy is also used to move rows up by MoveRowsUp.
ShiftViewLeftByte	C9C9	LD HL,$E5BC	Point HL at the second byte of the screen buffer.
	C9CC	LD ($5CDA),SP	Save the stack pointer.
	C9D0	LD SP,HL	Point the stack at that byte.
	C9D1	DEC HL	Point HL at the byte to its left.
	C9D2	LD B,$80	Set the row count to 80.
This entry point is used by the routine at MoveRowsUp.
ShiftViewLeftByte_Copy	C9D4	POP DE	Copy the twenty-four bytes of the next row from the stack.
	C9D5	LD (HL),E
	C9D6	INC HL
	C9D7	LD (HL),D
	C9D8	INC HL
	C9D9	POP DE
	C9DA	LD (HL),E
	C9DB	INC HL
	C9DC	LD (HL),D
	C9DD	INC HL
	C9DE	POP DE
	C9DF	LD (HL),E
	C9E0	INC HL
	C9E1	LD (HL),D
	C9E2	INC HL
	C9E3	POP DE
	C9E4	LD (HL),E
	C9E5	INC HL
	C9E6	LD (HL),D
	C9E7	INC HL
	C9E8	POP DE
	C9E9	LD (HL),E
	C9EA	INC HL
	C9EB	LD (HL),D
	C9EC	INC HL
	C9ED	POP DE
	C9EE	LD (HL),E
	C9EF	INC HL
	C9F0	LD (HL),D
	C9F1	INC HL
	C9F2	POP DE
	C9F3	LD (HL),E
	C9F4	INC HL
	C9F5	LD (HL),D
	C9F6	INC HL
	C9F7	POP DE
	C9F8	LD (HL),E
	C9F9	INC HL
	C9FA	LD (HL),D
	C9FB	INC HL
	C9FC	POP DE
	C9FD	LD (HL),E
	C9FE	INC HL
	C9FF	LD (HL),D
	CA00	INC HL
	CA01	POP DE
	CA02	LD (HL),E
	CA03	INC HL
	CA04	LD (HL),D
	CA05	INC HL
	CA06	POP DE
	CA07	LD (HL),E
	CA08	INC HL
	CA09	LD (HL),D
	CA0A	INC HL
	CA0B	POP DE
	CA0C	LD (HL),E
	CA0D	INC HL
	CA0E	LD (HL),D
	CA0F	INC HL
	CA10	DJNZ ShiftViewLeftByte_Copy	Decrease the row count and jump back until every row has been copied.
	CA12	LD SP,($5CDA)	Restore the stack pointer.
	CA16	RET	Return.