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Routines |
| Prev: D1FF | Up: Map | Next: D23B |
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Used by the routine at D1D2.
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Helps keep track and limit the number of graphic items on-screen during the tunnel sections. Jump from D1D7 if tunnel item is no longer visible on-screen.
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| D21B | LD A,$00 | |||
| D21D | LD ($EB43),A | Set type of graphic to draw to 0 | ||
| D220 | LD A,($EB46) | |||
| D223 | CP $03 | Check if tunnel item type < 3 | ||
| D225 | JR NC,$D231 | |||
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If so, it's a left/right boundary graphic that's now gone off-screen
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| D227 | LD A,($EB7E) | Byte holding the number of boundary wall graphics currently on screen. This number is checked & limited (to 20) at D6E3. | ||
| D22A | DEC A | Decrement this counter, as there's now one less... | ||
| D22B | LD ($EB7E),A | ...and re-store. | ||
| D22E | JP $D27D | |||
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Creature has gone off-screen
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| D231 | LD A,($EC9D) | Counter for number of creatures currently on-screen (max 3) | ||
| D234 | DEC A | Decrement number... | ||
| D235 | LD ($EC9D),A | ...and re-store | ||
| D238 | JP $D27D | |||
| Prev: D1FF | Up: Map | Next: D23B |