Routines
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D4CD: Clear the rest of a foreground record, then carry on
A type's template list can hold more than one template, ended by a 0, so one location can build several records -- each the next template placed at the same cell.
zero_fg_obj_tail D4CD LD (IY+$00),$00 zero bytes 9 to 31, leaving IY on the next record
D4D1 INC IY
D4D3 DJNZ zero_fg_obj_tail
D4D5 POP BC more templates for this location until a 0
D4D6 LD A,(HL)
D4D7 AND A
D4D8 JR NZ,next_fg_obj_sprite
D4DA POP DE DE = the start of the template list; HL on the room record
D4DB POP HL
D4DC DEC B each location counts off B; at zero the room record is used up
D4DD JR Z,end_of_fg_objs
D4DF DEC C all the locations of this type placed: read the next type byte
D4E0 JP Z,next_fg_obj
D4E3 LD A,(HL) another location of the same type: D = its byte, and HL back on the template list
D4E4 INC HL
D4E5 PUSH HL
D4E6 EX DE,HL
D4E7 LD D,A
D4E8 JR next_fg_obj_in_count
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