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Routines |
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Used by the routine at 58945.
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This routine cycles through the spell list at 28156, printing any spells that have been collected.
If the first byte of a spell's data set is 16, it means the spell has been collected and is available for display/selection.
Check whether it's up or down that's been pressed:
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| 59033 | LD C,A | Temp store for up/down flag: 1 = up, -1 (255) = down | ||
| 59034 | LD A,(60070) | Retrieve the counter flag set in the previous routine, used to create the incremental pitch sound effects as the player scrolls through the spells | ||
| 59037 | CP 0 | Skip next two instructions if zero (reached max pitch) | ||
| 59039 | JR Z,59045 | |||
| 59041 | DEC A | Otherwise decrement... | ||
| 59042 | LD (60070),A | ...and re-store. | ||
| 59045 | LD A,C | Retrieve the up/down flag value from C register | ||
| 59046 | CP 1 | Check if UP pressed. If not, run the following routine for DOWN. | ||
| 59048 | JR Z,59089 | |||
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DOWN pressed while in spell menu:
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| 59050 | LD A,(60130) | Spell counter (up to 27 spells) for current spell | ||
| 59053 | LD HL,(60131) | Address pointer for the current position in the spell list (spells at 28156) | ||
| 59056 | LD DE,65520 | |||
| 59059 | CP 0 | If we don't currently have a counter position (byte at 60130 is zero), then start at the end of the spell list ready to move up it | ||
| 59061 | JR NZ,59070 | |||
| 59063 | LD HL,(60263) | Address pointer for the end of the spell list texts at 28604 | ||
| 59066 | LD A,(60265) | Total number of spells (27) | ||
| 59069 | INC A | Incremented ready for decrement at the start of the following loop | ||
| 59070 | ADD HL,DE | Subtracts 16 from HL - first check is the data set for the last spell (MESSAGE) at 28588 | ||
| 59071 | DEC A | Decrement spell number counter (starts at 27) | ||
| 59072 | LD C,A | Store temporarily | ||
| 59073 | LD A,(HL) | Get 'spell collected' data byte | ||
| 59074 | CP 16 | Has the spell been collected (byte value = 16)? | ||
| 59076 | LD A,C | (Retrieve spell number counter) | ||
| 59077 | JR NZ,59059 | If it hasn't been collected, keep checking the rest of the spells | ||
| 59079 | LD (60130),A | Spell is available, so store the spell counter... | ||
| 59082 | LD (60131),HL | ...and the spell list address pointer | ||
| 59085 | CALL 57139 | Print the spell names on the scroll | ||
| 59088 | RET | |||
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UP pressed while in spell menu:
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| 59089 | LD A,(60130) | Spell counter (up to 27 spells) for current spell | ||
| 59092 | LD C,A | |||
| 59093 | LD HL,(60131) | Address pointer for the current position in the spell list (spells at 28156) | ||
| 59096 | LD DE,16 | Offset for the spell address pointer to move down to the next spell | ||
| 59099 | LD A,(60265) | Total number of spells | ||
| 59102 | CP C | Check if we've reached the end of the list... | ||
| 59103 | JR NZ,59112 | |||
| 59105 | LD HL,(60261) | ...If so, switch to the start of the spell list | ||
| 59108 | LD C,0 | ...and set the spell counter to zero | ||
| 59110 | JR 59114 | |||
| 59112 | ADD HL,DE | Move down to next spell | ||
| 59113 | INC C | Increment the spell counter | ||
| 59114 | LD A,(HL) | Get 'spell collected' data byte | ||
| 59115 | CP 16 | Has the spell been collected (byte value = 16)? | ||
| 59117 | JR NZ,59099 | If it hasn't been collected, keep checking the rest of the spells | ||
| 59119 | LD A,C | Spell is available, so store the spell counter... | ||
| 59120 | LD (60130),A | |||
| 59123 | LD (60131),HL | ...and the spell list address pointer | ||
| 59126 | CALL 57139 | Print the spell names on the scroll | ||
| 59129 | RET | |||
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