Bubbler: Routine at CB23

CB23: Shift View Right Byte

Shifts the screen buffer to the right by one byte, by using the stack pointer to copy it. The part from ShiftViewRightByte_Copy is also used to move rows down by MoveRowsDown.
ShiftViewRightByte	CB23	LD ($5CDA),SP	Save the stack pointer.
	CB27	LD HL,$F1B9	Point HL at the last two bytes of the screen buffer.
	CB2A	LD SP,HL	Point the stack at them.
	CB2B	POP DE	Skip those two bytes, which the shift overwrites.
	CB2C	LD B,$80	Set the row count to 80.
This entry point is used by the routine at MoveRowsDown.
ShiftViewRightByte_Copy	CB2E	LD D,(HL)	Copy the twenty-four bytes of the next row onto the stack, walking backwards.
	CB2F	DEC HL
	CB30	LD E,(HL)
	CB31	DEC HL
	CB32	PUSH DE
	CB33	LD D,(HL)
	CB34	DEC HL
	CB35	LD E,(HL)
	CB36	DEC HL
	CB37	PUSH DE
	CB38	LD D,(HL)
	CB39	DEC HL
	CB3A	LD E,(HL)
	CB3B	DEC HL
	CB3C	PUSH DE
	CB3D	LD D,(HL)
	CB3E	DEC HL
	CB3F	LD E,(HL)
	CB40	DEC HL
	CB41	PUSH DE
	CB42	LD D,(HL)
	CB43	DEC HL
	CB44	LD E,(HL)
	CB45	DEC HL
	CB46	PUSH DE
	CB47	LD D,(HL)
	CB48	DEC HL
	CB49	LD E,(HL)
	CB4A	DEC HL
	CB4B	PUSH DE
	CB4C	LD D,(HL)
	CB4D	DEC HL
	CB4E	LD E,(HL)
	CB4F	DEC HL
	CB50	PUSH DE
	CB51	LD D,(HL)
	CB52	DEC HL
	CB53	LD E,(HL)
	CB54	DEC HL
	CB55	PUSH DE
	CB56	LD D,(HL)
	CB57	DEC HL
	CB58	LD E,(HL)
	CB59	DEC HL
	CB5A	PUSH DE
	CB5B	LD D,(HL)
	CB5C	DEC HL
	CB5D	LD E,(HL)
	CB5E	DEC HL
	CB5F	PUSH DE
	CB60	LD D,(HL)
	CB61	DEC HL
	CB62	LD E,(HL)
	CB63	DEC HL
	CB64	PUSH DE
	CB65	LD D,(HL)
	CB66	DEC HL
	CB67	LD E,(HL)
	CB68	DEC HL
	CB69	PUSH DE
	CB6A	DJNZ ShiftViewRightByte_Copy	Decrease the row count and jump back until every row has been copied.
	CB6C	LD SP,($5CDA)	Restore the stack pointer.
	CB70	RET	Return.