Routines
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AF05: Update Special Objects
Used by the routines at GameOver and BuildRoomObjects.
Copies the number, position and room of each valve in SpecialObjectSlots back to its entry in SpecialObjects, so that they are remembered when the player leaves the room. Other special objects, such as extra lives, are not copied.
Copy each valve back to the table.
UpdateSpecialObjects AF05 LD IY,$5BC8 Point IY at SpecialObjectSlots.
UpdateSpecialObjects_TestSlot AF09 LD A,(IY+$00) Fetch the object number.
AF0C SUB $60 Subtract 60.
AF0E CP $08 Jump to UpdateSpecialObjects_NextSlot unless the object is a valve.
AF10 JR NC,UpdateSpecialObjects_NextSlot
AF12 LD E,(IY+$10) Fetch the low byte of the entry address.
AF15 LD D,(IY+$11) Fetch the high byte of the entry address.
AF18 LD A,(IY+$00) Fetch the object number.
AF1B LD (DE),A Store it in the entry.
AF1C INC DE Move on to the current x position.
AF1D INC DE
AF1E INC DE
AF1F INC DE
AF20 INC DE
AF21 PUSH IY Copy IY to HL (using the stack).
AF23 POP HL
AF24 INC HL Move on to the x position of the object.
AF25 LD BC,$0003 Set BC to 0003.
AF28 LDIR Copy the x, y and z coordinates to the entry.
AF2A LD A,(IY+$08) Fetch the room.
AF2D LD (DE),A Store it in the entry.
UpdateSpecialObjects_NextSlot AF2E LD BC,$0020 Set BC to 0020.
AF31 ADD IY,BC Move on to the next slot.
AF33 PUSH IY Copy IY to HL (using the stack).
AF35 POP HL
AF36 LD BC,$5C08 Point BC at RoomObjects.
AF39 AND A Subtract RoomObjects from HL.
AF3A SBC HL,BC
AF3C JR C,UpdateSpecialObjects_TestSlot Jump to UpdateSpecialObjects_TestSlot if there are more slots.
AF3E RET Return.
View the equivalent code in;
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