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Routines |
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Subtracts A from flag B, sticking at zero.
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| SubtractFromFlag | 27134 | CALL FlagAddress | Point at flag B. A is the amount to subtract. | |||||||
| 27137 | LD (23444),A | |||||||||
| 27140 | LD A,(HL) | The flag minus the amount, via the scratch byte. | ||||||||
| 27141 | PUSH HL | |||||||||
| 27142 | LD HL,23444 | |||||||||
| 27145 | AND A | The result sticks at zero. | ||||||||
| 27146 | SUB (HL) | |||||||||
| 27147 | JR NC,SubtractFlag_Store | |||||||||
| 27149 | XOR A | |||||||||
| SubtractFlag_Store | 27150 | POP HL | Store the result. | |||||||
| 27151 | LD (HL),A | |||||||||
| 27152 | RET | Return. | ||||||||
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