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Routines |
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Used by the routines at WANDERING_MONSTER and FIND_WANDER.
For the finds (FIND_WANDER, B=4) and the monsters of graphics 64-79 (WANDERING_MONSTER, B=7). The low six bits of +6 count turns down; when they run out, or when the step has become 0 both ways, a new step is drawn for U and V from the random number's two bytes (RANDOM_STEP: up to twice B either way, those near B likeliest) and a new count of 0-63 from R. The facing's top two bits are set again from the step by MOVE_SPLIT, which follows.
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| WANDER_STEP | DDCF | DEC (IX+$06) | Count down; a new step when the count runs out... | |||||||
| DDD2 | LD A,(IX+$06) | |||||||||
| DDD5 | AND $3F | |||||||||
| DDD7 | JR Z,WANDER_STEP_0 | |||||||||
| DDD9 | LD A,(IX+$0A) | ...or when the old one is 0 both ways | ||||||||
| DDDC | OR (IX+$0B) | |||||||||
| DDDF | RET NZ | |||||||||
| WANDER_STEP_0 | DDE0 | LD A,(RANDOM) | The U step, from the random number's low byte | |||||||
| DDE3 | LD C,A | |||||||||
| DDE4 | CALL RANDOM_STEP | |||||||||
| DDE7 | LD (IX+$0A),A | |||||||||
| DDEA | LD A,($BBAB) | The V step, from its high byte | ||||||||
| DDED | LD C,A | |||||||||
| DDEE | CALL RANDOM_STEP | |||||||||
| DDF1 | LD (IX+$0B),A | |||||||||
| DDF4 | LD A,R | A new count of 0-63 | ||||||||
| DDF6 | AND $3F | |||||||||
| DDF8 | LD (IX+$06),A | |||||||||
| DDFB | RET | |||||||||
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