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Routines |
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Used by the routine at Game_Initialisation.
Carries out this step while the game is running.
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Handle the game ticker.
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| Handler_GameClock | BFD9 | LD HL,($9FDD) | Increment *CurrentTime_Ticker by one. | |||||||
| BFDC | INC HL | |||||||||
| BFDD | LD ($9FDD),HL | |||||||||
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Handle the clock minutes.
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| BFE0 | LD HL,$9FDF | Increment *CurrentTime_Minutes by one. | ||||||||
| BFE3 | INC (HL) | |||||||||
| BFE4 | LD A,(HL) | Return unless the minute count has reached 3C. | ||||||||
| BFE5 | CP $3C | |||||||||
| BFE7 | RET NZ | |||||||||
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The minutes is at 60, which is invalid - so handle rolling the clock hour digits.
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| BFE8 | LD (HL),$00 | Reset the minutes back to 00 at *HL. | ||||||||
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Handle the clock hours.
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| BFEA | LD HL,$9FE0 | Increment *CurrentTime_Hour by one. | ||||||||
| BFED | INC (HL) | |||||||||
| BFEE | LD A,(HL) | Jump to Handler_GameClock_AM_PM unless the hour has reached 0D. | ||||||||
| BFEF | CP $0D | |||||||||
| BFF1 | JR NZ,Handler_GameClock_AM_PM | |||||||||
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The hours is at 13. which is invalid - so handle rolling the clock.
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| BFF3 | LD (HL),$01 | Reset the hours back to 01 at *HL. | ||||||||
| BFF5 | RET | Return. | ||||||||
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Noon or midnight flips the AM/PM marker.
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| Handler_GameClock_AM_PM | BFF6 | CP $0C | Return unless the hour is 0C. | |||||||
| BFF8 | RET NZ | |||||||||
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It's either midday or midnight, so flip between AM and PM.
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| BFF9 | LD A,($9FE2) | Read the AM/PM marker. | ||||||||
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Smart way of altering the letter from "a" to "p" and back again.
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| BFFC | XOR %00010001 | Flip bits 0, 4. | ||||||||
| BFFE | LD ($9FE2),A | Write this back to *Messaging_AM_PM. | ||||||||
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If the clock went from PM to AM, handle rolling the day of the week.
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| C001 | CP $61 | Return unless the AM/PM marker is the letter a. | ||||||||
| C003 | RET NZ | |||||||||
| C004 | LD A,($9FE1) | Increment *CurrentDayOfWeek by one. | ||||||||
| C007 | INC A | |||||||||
| C008 | LD ($9FE1),A | |||||||||
| C00B | RET | Return. | ||||||||
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