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Routines |
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Used by the routine at TAKE_OR_LEAVE.
The pick-up bit is 4 of INPUT, except with a joystick and bit 3 of CONTROL set, when it is taken from bit 5 -- as in Knight Lore (chk_pickup_drop), where a directional joystick uses down for a direction and keys set bit 5 instead. Pentagram's READ_CONTROLS never sets bit 5, so in that mode, which no menu choice selects, nothing could be picked up or put down.
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| CHK_PICKUP_DROP | BF66 | LD HL,CONTROL | a joystick (method not 0)... | |||||||
| BF69 | LD A,(HL) | |||||||||
| BF6A | AND $06 | |||||||||
| BF6C | LD A,(INPUT) | |||||||||
| BF6F | JR Z,CHK_PICKUP_DROP_0 | |||||||||
| BF71 | BIT 3,(HL) | |||||||||
| BF73 | JR Z,CHK_PICKUP_DROP_0 | |||||||||
| BF75 | RRCA | ...and directional control: bit 5 moves into bit 4 | ||||||||
| CHK_PICKUP_DROP_0 | BF76 | AND $10 | the pick-up bit | |||||||
| BF78 | RET | |||||||||
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