| 157 | | === Opcodes |
| 158 | | |
| 159 | | ==== 00: Return |
| 160 | | |
| 161 | | "Return" or "End of line". If this is not present at the end of a line, the execution may continue with the next one? |
| 162 | | |
| 163 | | ==== 01 xx: CheckFlag |
| 164 | | |
| 165 | | Check if flag number xx is set. This is used for internal flags tracking the game state. |
| 166 | | |
| 167 | | ==== 03 xx: HasItem |
| 168 | | |
| 169 | | Check if the player is carrying item xx. |
| 170 | | |
| 171 | | ==== 09 xx yyyy: IfEqual |
| 172 | | |
| 173 | | Compare counter xx with value yyyy and continue executing the line if they are equal |
| 174 | | |
| 175 | | ==== 0A xx yyyy: IfLess |
| 176 | | |
| 177 | | Compare counter with value and continue if it is less than the value |
| 178 | | |
| 179 | | ==== 0D xx yy: Check event |
| 180 | | |
| 181 | | A lot of the conditions start with {{{0D}}}. This matches with an event from a button click. |
| 182 | | |
| 183 | | For example, if a room has a button number 1, {{{0D 01 00}}} will match that, and the corresponding action will be triggered. |
| 184 | | |
| 185 | | Every button click is matched with conditions in the current room as well as the ones in CONDGEN and/or CONDULTI. |
| 186 | | |
| 187 | | Actions involving objects use the second parameter, for example {{{0D 68 05}}} corresponds to action 68 done on object 05. |
| 188 | | |
| 189 | | ==== 0E xx: Check global event |
| 190 | | |
| 191 | | Check global events, for example event 00 is the start of the game. |
| 192 | | |
| 193 | | ==== 7E: Or |
| 194 | | |
| 195 | | Used to combine multiple conditions (0D, 09, 0A, ...) |
| 196 | | |
| 197 | | ==== 7F: And? |
| 198 | | |
| 199 | | Probably And, also used to combine several conditions. |
| 200 | | |
| 201 | | ==== 80 xx: ? |
| 202 | | |
| 203 | | Currently unknown |
| 204 | | |
| 205 | | ==== 81 xx: Set flag |
| 206 | | |
| 207 | | Set flag xx |
| 208 | | |
| 209 | | ==== 82 xx: Clear flag |
| 210 | | |
| 211 | | Clear flag xx |
| 212 | | |
| 213 | | ==== 83 xx: Get item |
| 214 | | |
| 215 | | Add item number x to the player's inventory |
| 216 | | |
| 217 | | ==== 85 xx: Remove item |
| 218 | | |
| 219 | | Remove item from the inventory. |
| 220 | | |
| 221 | | ==== 87 xx yyyy: Set counter |
| 222 | | |
| 223 | | Set counter xx to value yyyy |
| 224 | | |
| 225 | | ==== 89 xx yyyy: Add to counter |
| 226 | | |
| 227 | | Add value yyyy to counter xx |
| 228 | | |
| 229 | | ==== 8A xx yyyy: Subtract from counter |
| 230 | | |
| 231 | | Subtract value yyyy from counter xx |
| 232 | | |
| 233 | | ==== 8F xx: Go to room |
| 234 | | |
| 235 | | Go to room passed as a parameter (single byte) |
| 236 | | |
| 237 | | ==== 90 xx: Go to screen |
| 238 | | |
| 239 | | Go to a screen (in the same room) passed as a parameter. |
| 240 | | |
| 241 | | ==== 91 xx: Show global screen |
| 242 | | |
| 243 | | Show one of the global screens (from the unique room in MSGGEN). |
| 244 | | |
| 245 | | ==== 93 xx: WithScreen |
| 246 | | |
| 247 | | Combined with a "Go to room", allows to set the target screen in the new room |
| 248 | | |
| 249 | | ==== 95 xx yy: Initialize flag |
| 250 | | |
| 251 | | ==== A0 xx yyyy |
| 252 | | |
| 253 | | Compare counter xx with value yyyy. This triggers an evaluation of the scripts with matching of the corresponding IfLess/IfEqual operations |
| 254 | | |
| 255 | | ==== FA: stop interpreter |
| 256 | | |
| 257 | | Do not test the remaining script lines |
| 258 | | |
| 259 | | ==== FC: Game over |
| 260 | | |
| 261 | | Trigger the "game over" and stop interpreting. This will ask the user if they want to restart from the last saving point or from the start of the adventure. |
| 262 | | |
| 263 | | ==== FD: Continue |
| 264 | | |
| 265 | | Continue execution with the next script line. |
| 266 | | |
| 267 | | ==== FE xx: Goto |
| 268 | | |
| 269 | | Call script number xx in the current room |
| 270 | | |
| 271 | | ==== FF: Winning the game |
| 272 | | |
| 273 | | The game is won if you manage to execute this opcode! |
| | 157 | The complete list of [[Opcodes]] (the ones known so far) in a separate page. |
