Knight Lore: Routine at B000

Used by the routine at ret_from_tbl_jp.

Draws everything the object walk decided on and then burns whatever time is left, so the game runs at an even speed rather than at whatever speed the room happens to allow.

The time is counted in units of drawing. The renderer counts at $5BBE every object it draws and every rectangle it wipes, and this waits for six units less that count. One unit of waiting is 1280 turns of a 26-cycle loop, about 33,300 T-states, just under half a 50Hz frame. So a room where fewer than six things change runs at the same speed as one where six do, and a room busier than that runs slower -- the delay can only pad, never take time back.

Used by the routine at ret_from_tbl_jp. Draws everything the object walk decided on and then burns whatever time is left, so the game runs at an even speed rather than at whatever speed the room happens to allow. The time is counted in units of drawing. The renderer counts at $5BBE every object it draws and every rectangle it wipes, and this waits for six units less that count. One unit of waiting is 1280 turns of a 26-cycle loop, about 33,300 T-states, just under half a 50Hz frame. So a room where fewer than six things change runs at the same speed as one where six do, and a room busier than that runs slower -- the delay can only pad, never take time back.
end_of_frame	B000	LD HL,($5BA2)	the 16-bit frame counter
	B003	INC HL
	B004	LD ($5BA2),HL
	B007	LD A,($5BA5)	stir it into the random byte, with whatever memory it happens to address
	B00A	ADD A,(HL)
	B00B	ADD A,L
	B00C	ADD A,H
	B00D	LD ($5BA5),A
	B010	LD HL,$5BB2	a frame has been played: the next room entry saves the charms' places back
	B013	SET 0,(HL)
	B015	CALL handle_pause	SPACE pauses
	B018	CALL init_cauldron_bubbles	bubbles in the cauldron room
	B01B	CALL list_objects_to_draw	list the objects flagged to be drawn
	B01E	CALL render_dynamic_objects	wipe, draw in depth order into the buffer at screen_buffer, and copy the changes to the screen
	B021	LD A,($5BC5)	during the finale, a tone pitched by the last spark's height
	B024	AND A
	B025	CALL NZ,sound_pitch_from_a
	B028	LD A,($5BBE)	six units, less what this frame already used
	B02B	NEG
	B02D	ADD A,$06
	B02F	LD B,A	none left to wait
	B030	JP M,no_delay
	B033	JR Z,no_delay