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Routines |
| Prev: D968 | Up: Map | Next: D99E |
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Used by the routine at ReadCommandLine_CommandLinePrints.
Turns a cursor key into a compass letter: right (09) to E, left (08) to W, down (0A) to S and up (5B) to N.
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| MapCursorKeys | D978 | CP $09 | Jump ahead to MapCursorKeys_East if the key is cursor right (09). | |
| D97A | JR Z,MapCursorKeys_East | |||
| D97C | CP $08 | Jump ahead to MapCursorKeys_West if the key is cursor left (08). | ||
| D97E | JR Z,MapCursorKeys_West | |||
| D980 | CP $0A | Jump ahead to MapCursorKeys_South if the key is cursor down (0A). | ||
| D982 | JR Z,MapCursorKeys_South | |||
| D984 | CP $5B | Return unless the key is cursor up (5B). | ||
| D986 | RET NZ | |||
| D987 | LD A,$4E | Take N for cursor up. | ||
| MapCursorKeys_0 | D989 | LD (HL),A | Store it at the line buffer and step to the next entry, then call Print_Character to print character. | |
| D98A | INC HL | |||
| D98B | CALL Print_Character | |||
| D98E | DEC B | Count down the remaining steps. | ||
| D98F | LD A,$0D | Leave 0D as the result. | ||
| D991 | RET | Return. | ||
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Cursor down selects the letter S.
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| MapCursorKeys_South | D992 | LD A,$53 | Take the direction letter S and go to MapCursorKeys_0 to store it in the line buffer and print it. | |
| D994 | JR MapCursorKeys_0 | |||
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Cursor right selects the letter E.
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| MapCursorKeys_East | D996 | LD A,$45 | Take the direction letter E and go to MapCursorKeys_0 to store it in the line buffer and print it. | |
| D998 | JR MapCursorKeys_0 | |||
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Cursor left selects the letter W.
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| MapCursorKeys_West | D99A | LD A,$57 | Take the direction letter W and go to MapCursorKeys_0 to store it in the line buffer and print it. | |
| D99C | JR MapCursorKeys_0 | |||
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View the equivalent code in;
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| Prev: D968 | Up: Map | Next: D99E |