94 lines
3.6 KiB
HTML
94 lines
3.6 KiB
HTML
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<HTML>
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<HEAD>
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<TITLE>Special variables</TITLE></HEAD>
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<BODY>
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<h1>Special variables</h1>
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Some variables have special meaning to the interpreter:<p>
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<pre>
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Var Define name in template game Description
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-------------------------------------------------------------------
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0 room_no Number of the current room
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1 prev_room_no Number of the previous room
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2 ego_edge_code Which edge of the screen ego is touching
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0: not touching edge
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1: horizon
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2: right edge
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3: bottom edge
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4: left edge
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3 score Current score
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4 object_touching_edge Number of an object other than ego that is
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touching the edge.
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5 object_edge_code See ego_edge_code
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6 ego_dir Direction of ego's motion (see "Moving
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Objects" for a list of directions).
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7 max_score Maxmimum score
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8 free_memory The number of 256-byte lots of free memory
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available for resources.
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If the player has entered an unknown word,
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9 unknown_word_no this is set to the number of that word
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(i.e. 2 if it's the second word entered).
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Otherwise, this is 0.
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10 cycle_delay Delay between interpreter cycles (*1/20
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second)
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Number of seconds on the interpreter's
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11 clock_seconds clock (the clock is reset when the game
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starts).
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12 clock_minutes Number of minutes on the interpreter's
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clock
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13 clock_hours Number of hours on the interpreter's clock
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14 clock_days Number of days on the interpreter's clock
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15 joystick_sensitivity Sensitivity of the joystick
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16 ego_view_no Number of the view assigned to ego
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17 error_code What type of error has occured
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18 error_information Extra information about the error
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19 key_pressed The ASCII code of the key that has just
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been pressed, if any
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20 computer_type Type of computer (0=PC)
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Number of half-seconds to wait before
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21 window_close_time closing a window (if 0, the window remains
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on screen until the user presses a key).
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22 sound_type Sound generator type. (PC=1,Tandy=3)
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23 sound_volume Volume of the sound
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24 (unknown) Always seems to be set to 41
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If the player has selected an inventory
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25 selected_inventory_item item from the inventory screen, this is
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set to the number of that item (or 255 if
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ESC was pressed).
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Video mode:
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0: CGA (black-cyan-magenta-white CGA
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palette)
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26 video_mode 1: RGB (blue-yellow-red-green CGA palette)
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2: Hercules
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3: EGA
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4: VGA
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</pre>
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<B>See also</B><p>
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<a href="special_flags.html">Special flags</a><p>
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</BODY></HTML>
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