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Routines |
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Used by the routine at TAKE_OR_LEAVE.
The pick-up bit is bit 4 of INPUT, except with a joystick and bit 3 of CONTROL (directional control) set, when it is taken from bit 5: then a joystick's down is a direction, and READ_CONTROLS sets bit 5 from any key but the number keys, CAPS SHIFT and SPACE instead. As Knight Lore's chk_pickup_drop.
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| CHK_PICKUP_DROP | BD58 | LD HL,CONTROL | the method, bits 1-2 of CONTROL | |||||||
| BD5B | LD A,(HL) | |||||||||
| BD5C | AND $06 | |||||||||
| BD5E | LD A,(INPUT) | this turn's controls; the keyboard: bit 4 as it is | ||||||||
| BD61 | JR Z,CHK_PICKUP_DROP_0 | |||||||||
| BD63 | BIT 3,(HL) | a joystick without directional control: bit 4 as it is | ||||||||
| BD65 | JR Z,CHK_PICKUP_DROP_0 | |||||||||
| BD67 | RRCA | a joystick with it: bit 5 moves into bit 4 | ||||||||
| CHK_PICKUP_DROP_0 | BD68 | AND $10 | the pick-up bit | |||||||
| BD6A | RET | |||||||||
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