Some variables have special meaning to the interpreter:
| Var | Define name in template game | Description |
|---|---|---|
| 0 | room_no |
Number of the current room |
| 1 | prev_room_no |
Number of the previous room |
| 2 | ego_edge_code |
Which edge of the screen ego is touching 0: not touching edge 1: horizon 2: right edge 3: bottom edge 4: left edge |
| 3 | score |
Current score |
| 4 | object_touching_edge |
Number of an object other than ego that is touching the edge. |
| 5 | object_edge_code |
See ego_edge_code |
| 6 | ego_dir |
Direction of ego's motion (see Moving Objects for a list of directions). |
| 7 | max_score |
Maxmimum score |
| 8 | free_memory |
The number of 256-byte lots of free memory available for resources. |
| 9 | unknown_word_no |
If the player has entered an unknown word, this is set to the number of that word (i.e. 2 if it's the second word entered). Otherwise, this is 0. |
| 10 | cycle_delay |
Delay between interpreter cycles (*1/20 second) |
| 11 | clock_seconds |
Number of seconds on the interpreter's clock (the clock is reset when the game starts). |
| 12 | clock_minutes |
Number of minutes on the interpreter's clock |
| 13 | clock_hours |
Number of hours on the interpreter's clock |
| 14 | clock_days |
Number of days on the interpreter's clock |
| 15 | joystick_sensitivity |
Sensitivity of the joystick |
| 16 | ego_view_no |
Number of the view assigned to ego |
| 17 | error_code |
What type of error has occured |
| 18 | error_information |
Extra information about the error |
| 19 | key_pressed |
The ASCII code of the key that has just been pressed, if any |
| 20 | computer_type |
Type of computer (0=PC) |
| 21 | window_close_time |
Number of half-seconds to wait before closing a window (if 0, the window remains on screen until the user presses a key). |
| 22 | sound_type |
Sound generator type. (PC=1,Tandy=3) |
| 23 | sound_volume |
Volume of the sound |
| 24 | (unknown) |
Always seems to be set to 41 |
| 25 | selected_inventory_item |
If the player has selected an inventory item from the inventory screen, this is set to the number of that item (or 255 if ESC was pressed). |
| 26 | video_mode |
Video mode: 0: CGA (black-cyan-magenta-white CGA palette) 1: RGB (blue-yellow-red-green CGA palette) 2: Hercules 3: EGA4: VGA |