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Routines |
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This waits until the user presses 'Y' or 'N', then returns an indication of which was pressed in the Z flag.
Used by the routines at keyscan_break and choose_keys.
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| user_confirm | EFFC | LD HL,$F014 | Print "CONFIRM Y OR N" | |||||
| EFFF | CALL screenlocstring_plot | |||||||
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Start loop (infinite)
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| user_confirm_0 | F002 | LD BC,$DFFE | Set BC to port_KEYBOARD_POIUY | |||||
| F005 | IN A,(C) | Read the port | ||||||
| F007 | BIT 4,A | Was bit 4 clear? (active low meaning 'Y' is pressed) | ||||||
| F009 | RET Z | Return with Z set if so | ||||||
| F00A | LD B,$7F | Set BC to port_KEYBOARD_SPACESYMSHFTMNB | ||||||
| F00C | IN A,(C) | Read the port | ||||||
| F00E | CPL | Invert the bits to turn active low into active high | ||||||
| F00F | BIT 3,A | Was bit 3 set? (active high meaning 'N' is pressed) | ||||||
| F011 | RET NZ | Return with Z clear if so | ||||||
| F012 | JR user_confirm_0 | ..loop | ||||||
| confirm_query | F014 | DEFB $0B,$50,$0F,$0C,$00,$17,$0F,$12,$1A,$16,$24,$23,$21,$23,$00,$1A,$23,$17 | "CONFIRM Y OR N" / screen address $500B, length $F, string='C0NFIRM. Y 0R N' | |||||
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