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Routines |
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Used by the routines at Display_High_Score_Entry_Screen, Save_Or_Load_High_Scores and Attract_Mode_Loop.
Reads all keyboard rows simultaneously (port FE with selector 00) during the high score display loop. Forces the upper three bits high; if any key is pressed, increments A past FF discards the caller's return address, and restarts the high score display at Display_High_Score_Entry_Screen. Returns normally if no keys are held.
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| Check_Any_Key_During_Display | ED71 | XOR A | Read all keyboard rows simultaneously. | |
| ED72 | IN A,($FE) | |||
| ED74 | OR %11100000 | Force bits 5-7 high. | ||
| ED76 | INC A | Return if no keys are pressed (A wraps to 00). | ||
| ED77 | RET Z | |||
| ED78 | POP HL | Discard the caller's return address from the stack. | ||
| ED79 | JP Display_High_Score_Entry_Screen | Restart the high score display at Display_High_Score_Entry_Screen. | ||
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