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Routines |
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For active cursor-type spells such as SERVANT, OPEN, REVEAL etc., pressing FIRE cancels the spell.
The exceptions are the FLAME and ELECTRIC spells, which keep the aiming cursor on-screen, allowing for multiple missiles to be fired without having to activate the spell from the scroll list again.
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| E9DD | LD A,($EAD5) | Flag indicating whether (any part of) graphic is visible on screen | ||
| E9E0 | CP $00 | 0 = not visible, 1 = visible | ||
| E9E2 | JP Z,$EA0D | If not visible, the servant/eye cursor has moved off the bottom of the playing area. Doing this cancels the spell, and in the case of the repeat-firing FLAME and ELECTRIC spells, it's the ONLY way to cancel the spell. Jump to EA0D for deactivation. |
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| E9E5 | LD A,($EB32) | Check FIRE key controls | ||
| E9E8 | CP $00 | |||
| E9EA | JP Z,$EAA0 | If not pressed, jump straight to RET | ||
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FIRE control key pressed.
This routine determines what action needs to be taken when FIRE is pressed when the cursor icon/servant is active:
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| E9ED | LD A,($EBCA) | This byte's value holds the action to take when a servant/spell icon spell is cast | ||
| E9F0 | CP $00 | For non-cursor spells, this byte is zero | ||
| E9F2 | JR Z,$E9FF | ...so make sure it's not one of these | ||
| E9F4 | LD C,A | Temp store of byte's 'action-value' in C register | ||
| E9F5 | AND $80 | Check bit 7, which is set for missile type spells (MISSILE, FIREBALL etc.) | ||
| E9F7 | JR Z,$E9FF | |||
| E9F9 | LD A,C | If it's set, retrieve the original byte... | ||
| E9FA | AND $7F | Filter out bit 7 | ||
| E9FC | LD ($EC98),A | ...and store the remaining value | ||
| E9FF | LD A,($EBC7) | Check the spell type | ||
| EA02 | CP $03 | 3 = ELECTRIC and FLAME spells | ||
| EA04 | JR NZ,$EA0D | |||
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For the FLAME and ELECTRIC spells, the aiming cursor remains on screen after firing. So the energy cost of the spell is deducted from Maroc's energy bar each time a bolt is fired, rather than just at the point of casting.
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| EA06 | LD A,($EBC6) | First get the energy cost of the spell... | ||
| EA09 | CALL $E3CC | ...and reduce Maroc's energy accordingly. | ||
| EA0C | RET | ...In this case, there's no more action to be taken re: the spell aiming cursor icon | ||
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For other spells, cancel the spell and get rid of the controllable sprite (flashing eye cursor, or servant):
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| EA0D | LD A,$00 | Set draw/erase flag to ERASE | ||
| EA0F | LD ($EACF),A | |||
| EA12 | LD ($EAEC),A | Also reset the temp store scroll spell number pointer (I think) | ||
| EA15 | LD HL,($EC94) | Retrieve the graphic address pointer to the servant/cursor icon graphic | ||
| EA18 | CALL $DB98 | ...and erase the graphic from screen. | ||
| EA1B | JR $EA72 | Jump to the routine that resets the flashing attributes indicating an active spell, at the top right of the scroll | ||
| Prev: E987 | Up: Map | Next: EA1D |