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Routines | 
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| D0D0 | PUSH DE | Stash DE on the stack. | ||
| D0D1 | LD DE,$68DE | DE=68DE. | ||
| D0D4 | EX DE,HL | Exchange the DE and HL registers. | ||
| D0D5 | SET 7,D | Set bit 7 of D. | ||
| D0D7 | LD (HL),D | Write D to *HL. | ||
| D0D8 | INC HL | Increment HL by one. | ||
| D0D9 | LD (HL),E | Write E to *HL. | ||
| D0DA | POP DE | Restore DE from the stack. | ||
| D0DB | RET | Return. | ||
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