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Routines |
| Prev: 30291 | Up: Map | Next: 30380 |
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| 30292 | PUSH HL | |||||||
| 30293 | LD HL,32756 | 32756 contains the doors flags | ||||||
| 30296 | LD A,E | A=x-coordinate of the point in front of the mouse/frog/pellet | ||||||
| 30297 | CP 190 | This is the x-coordinate of the far wall of the girls' skool | ||||||
| 30299 | JR NC,30335 | Jump if the mouse/frog/pellet is facing this wall | ||||||
| 30301 | LD A,D | A=y-coordinate of the mouse/frog/pellet | ||||||
| 30302 | CP 5 | Is the mouse/frog/pellet on the top floor (or just below it)? | ||||||
| 30304 | JR NC,30338 | Jump if not | ||||||
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The mouse/frog/pellet is on the top floor.
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| 30306 | LD A,E | A=x-coordinate of the point in front of the mouse/frog/pellet | ||||||
| 30307 | CP 159 | This is the x-coordinate of the left wall of the girls' skool | ||||||
| 30309 | JR Z,30335 | Jump if the mouse/frog/pellet is facing this wall | ||||||
| 30311 | LD D,1 | Set bit 0: left study door | ||||||
| 30313 | CP 72 | This is the x-coordinate of the left study door | ||||||
| 30315 | JR Z,30331 | Jump if the mouse/frog/pellet is facing this door | ||||||
| 30317 | INC D | Set bit 1: right study door | ||||||
| 30318 | CP 84 | This is the x-coordinate of the right study door | ||||||
| 30320 | JR Z,30331 | Jump if the mouse/frog/pellet is facing this door | ||||||
| 30322 | LD D,64 | Set bit 6: top-floor window | ||||||
| 30324 | CP 92 | This is the x-coordinate of the top-floor window | ||||||
| 30326 | JR Z,30331 | Jump if the mouse/frog/pellet is facing this window | ||||||
| 30328 | AND A | Clear the carry flag: no obstacles ahead | ||||||
| 30329 | POP HL | Restore the character number of the mouse/frog/pellet to H | ||||||
| 30330 | RET | Return with the carry flag reset | ||||||
| 30331 | LD A,D | A holds the identifier of the door or window in front of the mouse/frog/pellet | ||||||
| 30332 | AND (HL) | Is this door/window open? | ||||||
| 30333 | JR NZ,30329 | Jump if so | ||||||
| 30335 | SCF | Set the carry flag: no admittance | ||||||
| 30336 | POP HL | Restore the character number of the mouse/frog/pellet to H | ||||||
| 30337 | RET | Return with the carry flag set | ||||||
| 30338 | CP 12 | |||||||
| 30340 | LD A,E | |||||||
| 30341 | JR NC,30366 | Jump if the mouse/frog/pellet is on the bottom floor (or just above it) | ||||||
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The mouse/frog/pellet is on the middle floor.
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| 30343 | CP 159 | This is the x-coordinate of the left wall of the girls' skool | ||||||
| 30345 | JR Z,30335 | Jump if the mouse/frog/pellet is facing this wall | ||||||
| 30347 | CP 62 | This is the x-coordinate of the far wall of the Science Lab storeroom | ||||||
| 30349 | JR Z,30335 | Jump if the mouse/frog/pellet is facing this wall | ||||||
| 30351 | CP 53 | This is the x-coordinate of the Science Lab storeroom door | ||||||
| 30353 | LD D,4 | Set bit 2: Science Lab storeroom door | ||||||
| 30355 | JR Z,30331 | Jump if the mouse/frog/pellet is facing this door | ||||||
| 30357 | LD D,128 | Set bit 7: middle-floor window | ||||||
| 30359 | CP 94 | This is the x-coordinate of the middle-floor window | ||||||
| 30361 | JR Z,30331 | Jump if the mouse/frog/pellet is facing this window | ||||||
| 30363 | AND A | Clear the carry flag: no obstacles ahead | ||||||
| 30364 | POP HL | Restore the character number of the mouse/frog/pellet to H | ||||||
| 30365 | RET | Return with the carry flag reset | ||||||
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The mouse/frog/pellet is on the bottom floor.
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| 30366 | LD D,8 | Set bit 3: boys' skool door | ||||||
| 30368 | CP 94 | This is the x-coordinate of the boys' skool door | ||||||
| 30370 | JR Z,30331 | Jump if mouse/frog/pellet is facing this door | ||||||
| 30372 | LD D,16 | Set bit 4: skool gate | ||||||
| 30374 | CP 133 | This is the x-coordinate of the skool gate | ||||||
| 30376 | JR Z,30331 | Jump if the mouse/frog/pellet is facing this | ||||||
| 30378 | JR 30363 | Otherwise it's all clear | ||||||
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