The code contained a bug, which has now been corrected (so my reasoning 
was correct after all!) The code is, therefore, complete and has both 
"search mode" and "run mode" functionality. The algorithm has not been 
designed to find the optimum solution, but a solution which removes 
"loops" and "dead-ends" and finds as "direct" as possible a path from 
the start to the centre. However, I plan to add an additional layer of 
code at a later date to this effect. I will now direct my efforts to 
converting the code from C to ASM. If anyone is genuinely interested in 
sharing this project and has some experience with ASM (or later on with 
the hardware side), then I would be interested in hearing from you, 
especially if you have experience with event/interrupt driven code, task 
scheduling and complex conditional statements in ASM. Please post a 
message in this thread and I will get back to you as soon as possible...


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|                                               |
+  +--+--+--+--+--+--+--+--+--+--+--+  +--+  +--+
|     |                          |              |
+  +  +  +--+--+--+--+--+--+--+  +--+--+--+  +  +
|  |  |                                   |  |  |
+  +  +  +--+--+--+--+--+--+--+--+--+--+  +  +  +
|  |  |     |  |                       |  |  |  |
+  +  +  +  +  +  +--+--+--+--+--+  +  +  +  +  +
|  |  |  |  |  |  |              |  |  |  |     |
+  +  +  +  +  +  +  +  +--+--+  +  +  +  +  +  +
|              |  |  |                 |     |  |
+  +--+  +  +  +  +  +  +--+--+  +--+--+  +--+  +
|  |  |  |  |  |  |  |           |        |  |  |
+  +  +  +  +  +  +  +--+--+  +  +  +--+--+  +  +
|  |  |  |  |  |  |  |     |  |  |     |  |  |  |
+  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +
|  |  |           |  |     |     |  |     |  |  |
+  +  +  +--+--+--+  +--+  +--+--+  +  +  +  +--+
|  |  |  |        |              |  |  |     |  |
+  +  +--+  +--+  +  +--+--+--+  +  +  +--+  +  +
|  |  |  |  |     |              |        |     |
+  +  +  +  +  +  +--+  +--+  +--+--+--+  +  +  +
|  |     |     |  |           |              |  |
+  +  +  +  +--+  +--+--+  +--+  +--+--+--+--+  +
|     |     |     |        |                 |  |
+--+--+--+--+  +--+--+  +--+--+--+--+--+  +--+  +
|                 |                 |           |
+  +--+--+  +--+  +--+--+  +--+--+  +--+--+  +  +
|  |                    |                    |  |
+  +  +--+--+--+--+--+  +  +--+--+--+--+--+--+  +
|  |                    |                       |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

P=0, start search mode...

16 32 33 34 35 36 52 53 69 85 101 100 99 83 67 68 84 68 67 51 50 66 82 
66 65 81 97 113 129 145 129 113 97 81 65 49 48 64 80 96 112 128 144 160 
161 177 193 209 225 224 240 241 242 243 244 245 246 247 248 249 250 251 
252 236 235 236 237 238 222 206 190 174 173 189 205 221 220 219 218 217 
216 215 214 213 212 211 210 194 195 179 163 164 180 196 180 164 148 132 
116 117 133 149 165 181 197 198 199 200 201 202 203 187 171 170 169 168 
167 151 152 153 137 121 122 138 154 138 122 121 137 153 152 151 167 183 
182 166 150 134 118 102 103 104 120

P=120, end search mode...

Output register contents to screen...

cell    PASSED          WALLS
----    --------        --------
0       0 1 1 1         0 1 1 1
1       1 1 1 1         1 1 1 1
2       1 1 1 1         1 1 1 1
3       1 1 1 1         1 1 1 1
4       1 1 1 1         1 1 1 1
5       1 1 1 1         1 1 1 1
6       1 1 1 1         1 1 1 1
7       1 1 1 1         1 1 1 1
8       1 1 1 1         1 1 1 1
9       1 1 1 1         1 1 1 1
10      1 1 1 1         1 1 1 1
11      1 1 1 1         1 1 1 1
12      1 1 1 1         1 1 1 1
13      1 1 1 1         1 1 1 1
14      1 1 1 1         1 1 1 1
15      1 1 1 1         1 1 1 1
16      0 1 1 0         0 1 1 0
17      1 1 1 1         1 1 1 1
18      1 1 1 1         1 1 1 1
19      1 1 1 1         1 1 1 1
20      1 1 1 1         1 1 1 1
21      1 1 1 1         1 1 1 1
22      1 1 1 1         1 1 1 1
23      1 1 1 1         1 1 1 1
24      1 1 1 1         1 1 1 1
25      1 1 1 1         1 1 1 1
26      1 1 1 1         1 1 1 1
27      1 1 1 1         1 1 1 1
28      1 1 1 1         1 1 1 1
29      1 1 1 1         1 1 1 1
30      1 1 1 1         1 1 1 1
31      1 1 1 1         1 1 1 1
32      1 1 0 0         1 1 0 0
33      1 0 0 1         1 0 0 1
34      1 0 0 1         1 0 0 1
35      1 0 0 1         1 0 0 0
36      0 0 1 1         0 0 0 1
37      1 1 1 1         1 1 1 1
38      1 1 1 1         1 1 1 1
39      1 1 1 1         1 1 1 1
40      1 1 1 1         1 1 1 1
41      1 1 1 1         1 1 1 1
42      1 1 1 1         1 1 1 1
43      1 1 1 1         1 1 1 1
44      1 1 1 1         1 1 1 1
45      1 1 1 1         1 1 1 1
46      1 1 1 1         1 1 1 1
47      1 1 1 1         1 1 1 1
48      0 1 0 1         0 1 0 1
49      0 0 1 1         0 0 1 1
50      0 1 0 1         0 1 0 1
51      0 0 1 1         0 0 1 1
52      1 1 0 0         1 1 0 0
53      0 0 1 1         0 0 1 1
54      1 1 1 1         1 1 1 1
55      1 1 1 1         1 1 1 1
56      1 1 1 1         1 1 1 1
57      1 1 1 1         1 1 1 1
58      1 1 1 1         1 1 1 1
59      1 1 1 1         1 1 1 1
60      1 1 1 1         1 1 1 1
61      1 1 1 1         1 1 1 1
62      1 1 1 1         1 1 1 1
63      1 1 1 1         1 1 1 1
64      0 1 1 0         0 1 1 0
65      1 1 0 0         1 1 0 0
66      1 0 1 0         1 0 1 0
67      0 1 1 0         0 1 1 0
68      1 1 1 1         1 1 1 1
69      0 1 1 0         0 1 1 0
70      1 1 1 1         1 1 1 1
71      1 1 1 1         1 1 1 1
72      1 1 1 1         1 1 1 1
73      1 1 1 1         1 1 1 1
74      1 1 1 1         1 1 1 1
75      1 1 1 1         1 1 1 1
76      1 1 1 1         1 1 1 1
77      1 1 1 1         1 1 1 1
78      1 1 1 1         1 1 1 1
79      1 1 1 1         1 1 1 1
80      0 1 1 0         0 1 1 0
81      1 1 1 1         1 1 1 1
82      1 1 1 1         1 1 1 1
83      0 1 1 0         0 1 1 0
84      1 1 1 1         1 1 1 1
85      0 1 1 0         0 1 1 0
86      1 1 1 1         1 1 1 1
87      1 1 1 1         1 1 1 1
88      1 1 1 1         1 1 1 1
89      1 1 1 1         1 1 1 1
90      1 1 1 1         1 1 1 1
91      1 1 1 1         1 1 1 1
92      1 1 1 1         1 1 1 1
93      1 1 1 1         1 1 1 1
94      1 1 1 1         1 1 1 1
95      1 1 1 1         1 1 1 1
96      0 1 1 0         0 1 1 0
97      1 1 1 1         1 1 1 1
98      1 1 1 1         1 1 1 1
99      1 1 0 0         1 1 0 0
100     1 0 0 1         1 0 0 1
101     1 0 1 0         1 0 1 0
102     0 1 0 1         0 1 0 0
103     1 0 0 1         1 0 0 1
104     0 0 1 1         0 0 0 1
105     1 1 1 1         1 1 1 1
106     1 1 1 1         1 1 1 1
107     1 1 1 1         1 1 1 1
108     1 1 1 1         1 1 1 1
109     1 1 1 1         1 1 1 1
110     1 1 1 1         1 1 1 1
111     1 1 1 1         1 1 1 1
112     0 1 1 0         0 1 1 0
113     1 1 1 1         1 1 1 1
114     1 1 1 1         1 1 1 1
115     1 1 1 1         1 1 1 1
116     0 1 0 1         0 0 0 1
117     0 0 1 1         0 0 1 1
118     0 1 1 0         0 1 1 0
119     1 1 1 1         1 1 1 1
120     1 1 1 0         1 1 1 1
121     1 1 1 1         1 1 1 1
122     1 1 1 1         1 1 1 1
123     1 1 1 1         1 1 1 1
124     1 1 1 1         1 1 1 1
125     1 1 1 1         1 1 1 1
126     1 1 1 1         1 1 1 1
127     1 1 1 1         1 1 1 1
128     0 1 1 0         0 1 1 0
129     1 1 1 1         1 1 1 1
130     1 1 1 1         1 1 1 1
131     1 1 1 1         1 1 1 1
132     0 1 1 0         0 1 1 0
133     0 1 1 0         0 1 1 0
134     0 1 1 0         0 1 1 0
135     1 1 1 1         1 1 1 1
136     1 1 1 1         1 1 1 1
137     1 1 1 1         1 1 1 1
138     1 1 1 1         1 1 1 1
139     1 1 1 1         1 1 1 1
140     1 1 1 1         1 1 1 1
141     1 1 1 1         1 1 1 1
142     1 1 1 1         1 1 1 1
143     1 1 1 1         1 1 1 1
144     0 1 1 0         0 1 1 0
145     1 1 1 1         1 1 1 1
146     1 1 1 1         1 1 1 1
147     1 1 1 1         1 1 1 1
148     0 1 1 0         0 1 1 0
149     0 1 1 0         0 1 1 0
150     0 1 1 0         0 1 1 0
151     1 1 1 1         1 1 1 1
152     1 1 1 1         1 1 1 1
153     1 1 1 1         1 1 1 1
154     1 1 1 1         1 1 1 1
155     1 1 1 1         1 1 1 1
156     1 1 1 1         1 1 1 1
157     1 1 1 1         1 1 1 1
158     1 1 1 1         1 1 1 1
159     1 1 1 1         1 1 1 1
160     1 1 0 0         0 1 0 0
161     0 0 1 1         0 0 1 1
162     1 1 1 1         1 1 1 1
163     0 1 0 1         0 0 0 0
164     1 0 1 0         1 0 1 0
165     0 1 1 0         0 1 1 0
166     0 1 1 0         0 1 1 0
167     0 1 0 1         0 1 0 1
168     1 0 0 1         1 0 0 1
169     1 0 0 1         1 0 0 1
170     1 0 0 1         0 0 0 1
171     0 0 1 1         0 0 0 1
172     1 1 1 1         1 1 1 1
173     0 1 0 1         0 1 0 0
174     0 0 1 1         0 0 1 1
175     1 1 1 1         1 1 1 1
176     1 1 1 1         1 1 1 1
177     0 1 1 0         0 1 1 0
178     1 1 1 1         1 1 1 1
179     0 1 1 0         0 1 1 0
180     1 1 1 1         1 1 1 1
181     0 1 1 0         0 1 1 0
182     1 1 0 0         1 1 0 0
183     1 0 1 0         1 0 0 0
184     1 1 1 1         1 1 1 1
185     1 1 1 1         1 1 1 1
186     1 1 1 1         1 1 1 1
187     0 1 1 0         0 1 1 0
188     1 1 1 1         1 1 1 1
189     0 1 1 0         0 1 1 0
190     0 1 1 0         0 1 0 0
191     1 1 1 1         1 1 1 1
192     1 1 1 1         1 1 1 1
193     0 1 1 0         0 1 1 0
194     0 1 0 1         0 1 0 0
195     1 0 1 0         1 0 1 0
196     1 1 1 1         1 1 1 1
197     1 1 0 0         1 1 0 0
198     1 0 0 1         1 0 0 1
199     1 0 0 1         1 0 0 1
200     1 0 0 1         1 0 0 1
201     1 0 0 1         1 0 0 1
202     1 0 0 1         1 0 0 1
203     1 0 1 0         1 0 0 0
204     1 1 1 1         1 1 1 1
205     0 1 1 0         0 1 1 0
206     0 1 1 0         0 1 1 0
207     1 1 1 1         1 1 1 1
208     1 1 1 1         1 1 1 1
209     0 1 1 0         0 1 1 0
210     1 1 0 0         0 1 0 0
211     1 0 0 1         1 0 0 1
212     1 0 0 1         1 0 0 1
213     1 0 0 1         1 0 0 1
214     1 0 0 1         1 0 0 1
215     1 0 0 1         1 0 0 1
216     1 0 0 1         1 0 0 1
217     1 0 0 1         1 0 0 1
218     1 0 0 1         0 0 0 1
219     1 0 0 1         1 0 0 1
220     1 0 0 1         1 0 0 1
221     1 0 1 0         1 0 1 0
222     0 1 1 0         0 1 1 0
223     1 1 1 1         1 1 1 1
224     0 1 0 1         0 1 0 0
225     1 0 1 0         1 0 1 0
226     1 1 1 1         1 1 1 1
227     1 1 1 1         1 1 1 1
228     1 1 1 1         1 1 1 1
229     1 1 1 1         1 1 1 1
230     1 1 1 1         1 1 1 1
231     1 1 1 1         1 1 1 1
232     1 1 1 1         1 1 1 1
233     1 1 1 1         1 1 1 1
234     1 1 1 1         1 1 1 1
235     1 1 1 1         1 1 1 1
236     0 1 0 1         0 1 0 1
237     1 0 0 1         1 0 0 1
238     1 0 1 0         0 0 0 0
239     1 1 1 1         1 1 1 1
240     1 1 0 0         1 1 0 0
241     1 0 0 1         1 0 0 1
242     1 0 0 1         1 0 0 1
243     1 0 0 1         1 0 0 1
244     1 0 0 1         1 0 0 1
245     1 0 0 1         1 0 0 1
246     1 0 0 1         1 0 0 1
247     1 0 0 1         1 0 0 1
248     1 0 0 1         1 0 0 1
249     1 0 0 1         1 0 0 1
250     1 0 0 1         1 0 0 1
251     1 0 0 1         1 0 0 1
252     1 0 1 0         1 0 0 0
253     1 1 1 1         1 1 1 1
254     1 1 1 1         1 1 1 1
255     1 1 1 1         1 1 1 1

P=120, start run mode...

104 103 102 118 134 150 166 182 183 167 168 169 170 171 187 203 202 201 
200 199 198 197 181 165 149 133 117 116 132 148 164 163 179 195 194 210 
211 212 213 214 215 216 217 218 219 220 221 205 189 173 174 190 206 222 
238 237 236 252 251 250 249 248 247 246 245 244 243 242 241 240 224 225 
209 193 177 161 160 144 128 112 96 80 64 48 49 65 66 50 51 67 83 99 100 
101 85 69 53 52 36 35 34 33 32 16 0

P=0, end run mode...

Press any key to continue