Dynamite Dan: Routine at EF1E

EF1E: Initialize moving objects in all rooms

Used by the routine at C881.
This routine loops through every moving object's movement table, and sets its visible flag, so that everything is in play when the game begins.
EF1E	LD HL,($69ED)	Point HL at the moving objects buffer. (69E6 + 7 / 8)
EF21	INC HL	Skip the first four bytes which hold the object IDs.
EF22	INC HL
EF23	INC HL
EF24	INC HL
EF25	LD B,$30	30 rooms to check.
EF27	PUSH BC	Remember BC.
EF28	LD A,(HL)	Get the first byte with the number of objects.
EF29	CALL $E9F8	Split the two 4-bit numbers into B and C.
EF2C	LD A,B	Put the combined total in D.
EF2D	ADD A,C
EF2E	LD D,A
EF2F	INC HL	Get the second byte with the number of objects.
EF30	LD A,(HL)	Get the second byte with the number of objects.
EF31	CALL $E9F8	Split the two 4-bit numbers into B and C.
EF34	LD A,B	Put the combined total, plus the earlier total in B as the number of moving objects in this room.
EF35	ADD A,C
EF36	ADD A,D
EF37	LD B,A
EF38	LD DE,$0005	Move to the start of the movement table.
EF3B	ADD HL,DE	Move to the start of the movement table.
EF3C	RES 6,(HL)	Set the sprite to be drawn.
EF3E	LD DE,$0008	Move to the next movement entry.
EF41	ADD HL,DE	Move to the next movement entry.
EF42	DJNZ $EF3C	Loop while there are more objects to look at it.
EF44	POP BC	Restore BC.
EF45	DJNZ $EF27	Loop back until all rooms have been checked.
EF47	RET	Loop back until all rooms have been checked.