|
Routines |
| Prev: 49940 | Up: Map | Next: 49997 |
|
Used by the routine at UpdateGhost.
Plays a sound for a ghost, if the ghost has been drawn in the view.
|
||||
| PlayGhostSound | 49970 | LD BC,49997 | Point at the pitches of the ghost sound. | |
|
This entry point is used by the routine at UpdateMonster.
Plays a sound effect, using a pitch from a table, if the object at IX has been drawn in the view. The routine that draws a sprite (see DrawSprite) sets bit 1 of the flags of the object, and this routine clears it.
When it is used for a monster (see UpdateMonster), the pitches come from the ROM instead (see SoundPitchTables).
|
||||
| PlayFlaggedSound | 49973 | BIT 1,(IX+7) | Check whether the object has been drawn in the view. | |
| 49977 | RES 1,(IX+7) | Clear the flag, ready for the next frame. | ||
| 49981 | RET Z | Return if the object was not drawn, because it can't be heard. | ||
| 49982 | LD A,(48050) | Fetch the low byte of the frame counter. | ||
| 49985 | AND %00001111 | Keep only the lowest four bits, to choose one of the sixteen pitches. | ||
| 49987 | LD L,A | Add it to the address of the table. | ||
| 49988 | LD H,0 | |||
| 49990 | ADD HL,BC | |||
| 49991 | LD B,(HL) | Fetch the pitch. | ||
| 49992 | LD C,12 | Set the length of the sound. | ||
| 49994 | JP PlayTone | Jump to PlayTone to play the tone. | ||
|
View the equivalent code in;
|
||||
| Prev: 49940 | Up: Map | Next: 49997 |