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Routines |
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Used by the routine at GamePlayEntry.
Used while the game is waiting to start the active player. Makes a low tone every sixteen frames and flashes the score label of the active player ("1UP" or "2UP").
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| ScoreLabelFlash | AEA1 | LD A,(HL) | Fetch the start-of-turn delay. | |||||
| AEA2 | AND %00001111 | Keep only bits 0-3. | ||||||
| AEA4 | CALL Z,PlayLowTone | Play the low tone if the start-of-turn delay is a multiple of 10 (every sixteenth frame). | ||||||
| AEA7 | LD A,($969E) | Jump to FlashScoreLabel2UP to flash the 2UP score label if 2UP is the active player (Flag_ActivePlayer is not zero). | ||||||
| AEAA | AND A | |||||||
| AEAB | JR NZ,FlashScoreLabel2UP | |||||||
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Flash 1UP score label.
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| AEAD | LD HL,$0010 | HL=00,10 (position of the 1UP score label). | ||||||
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Set flash state for the 3-attributes of the score label.
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| FlashText | AEB0 | CALL AttributeAddress | Find the attribute address of the score label. | |||||
| AEB3 | LD B,$03 | Set the letter counter in B to 03 (one for each letter of a score label). | ||||||
| FlashText_Loop | AEB5 | LD A,(HL) | Fetch the attribute byte. | |||||
| AEB6 | OR %10000000 | Ensure bit 7 is set (the flash bit). | ||||||
| AEB8 | LD (HL),A | Write the attribute byte back. | ||||||
| AEB9 | INC HL | Move onto the next attribute. | ||||||
| AEBA | DJNZ FlashText_Loop | Decrease the letter counter by one and loop back to FlashText_Loop until all three letters have been flashed. | ||||||
| AEBC | RET | Return. | ||||||
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This entry point is used by the routine at GamePlayEntry.
Unset flash state for the 3-attributes of the score label.
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| UnsetFlashText | AEBD | CALL AttributeAddress | Find the attribute address of the score label. | |||||
| AEC0 | LD B,$03 | Set the letter counter in B to 03 (one for each letter of a score label). | ||||||
| UnsetFlashText_Loop | AEC2 | LD A,(HL) | Fetch the attribute byte. | |||||
| AEC3 | AND %01111111 | Keep only bits 0-6 (i.e. everything except the flash bit). | ||||||
| AEC5 | LD (HL),A | Write the attribute byte back. | ||||||
| AEC6 | INC HL | Move onto the next attribute. | ||||||
| AEC7 | DJNZ UnsetFlashText_Loop | Decrease the letter counter by one and loop back to UnsetFlashText_Loop until all three letters have been unflashed. | ||||||
| AEC9 | RET | Return. | ||||||
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Flash 2UP score label.
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| FlashScoreLabel2UP | AECA | LD HL,$00D8 | HL=00,D8 (position of the 2UP score label). | |||||
| AECD | JR FlashText | Jump to FlashText. | ||||||
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View the equivalent code in;
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