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Routines |
| Prev: 83F5 | Up: Map | Next: 8451 |
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Used by the routine at GameOver_Start.
Turns one decimal digit of the score into ASCII, counting up from '0'.
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Converts e.g. "0075" into "7.5" in ASCII for display purposes.
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| PercentageAscii | 842E | LD A,$2F | Start the quotient digit one below '0'. | |
| PercentageAscii_Loop | 8430 | INC A | Count the digit up by one. | |
| 8431 | AND A | Clear carry for the subtraction. | ||
| 8432 | SBC HL,DE | Subtract the power of ten in DE from HL. | ||
| 8434 | JR NC,PercentageAscii_Loop | Jump back to PercentageAscii_Loop to count another digit unless the subtraction went below zero. | ||
| 8436 | ADD HL,DE | Add the power of ten back to leave the remainder. | ||
| 8437 | CP $30 | Compare against 30 (ASCII "0") to set flags for the return. | ||
| 8439 | RET | Return. | ||
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Reached through the special-key table at 8271, dispatched from Command_MatchASpecialKey.
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| 843A | LD A,$04 | Set the border to 04 (green). | ||
| 843C | OUT ($FE),A | |||
| 843E | CALL DebounceAnyKey | Call DebounceAnyKey to debounce keyboard. | ||
| Wait_ForKey | 8441 | XOR A | Read from the keyboard port. | |
| 8442 | IN A,($FE) | |||
| 8444 | AND %00011111 | Keep bits 0-4, one for each key in the half-row. XOR A then IN A,(FE) reads every half-row at once, and a pressed key reads as a reset bit. | ||
| 8446 | CP $1F | Loop back to Wait_ForKey while a key is being pressed. | ||
| 8448 | JR NZ,Wait_ForKey | |||
| 844A | LD A,$07 | Set the border to 07 (white). | ||
| 844C | OUT ($FE),A | |||
| 844E | JP CommandDispatchAControl | Jump back to CommandDispatchAControl to dispatch a control. | ||
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