To implement out of world actions relating to the program state.

• §1. Quit The Game Rule
• §2. Restart The Game Rule
• §3. Restore The Game Rule
• §4. Save The Game Rule
• §5. Perform Undo
• §6. Verify The Story File Rule
• §7. Switch Transcript On Rule
• §8. Switch Transcript Off Rule
• §9. Announce Story File Version Rule

§1. Quit The Game Rule.

[ QUIT_THE_GAME_R;
    if (actor ~= player) rfalse;
    QUIT_THE_GAME_RM('A');
    if (YesOrNo()~=0) quit;
];

§2. Restart The Game Rule.

[ RESTART_THE_GAME_R;
    if (actor ~= player) rfalse;
    RESTART_THE_GAME_RM('A');
    if (YesOrNo()~=0) {
        VM_Restart();
        RESTART_THE_GAME_RM('B'); new_line;
    }
];

§3. Restore The Game Rule.

[ RESTORE_THE_GAME_R;
    if (actor ~= player) rfalse;
    if (VM_Restore()) {
        RESTORE_THE_GAME_RM('B'); new_line;
    } else {
        RESTORE_THE_GAME_RM('A'); new_line;
    }
];

§4. Save The Game Rule.

[ SAVE_THE_GAME_R flag;
    if (actor ~= player) rfalse;
    switch (VM_Save()) {
        0: SAVE_THE_GAME_RM('A'); new_line;
        1: SAVE_THE_GAME_RM('B'); new_line;
        2: RESTORE_THE_GAME_RM('B'); new_line;
    }
];

§5. Perform Undo.

[ Perform_Undo;
    if (CommandParserKit`UNDO_PREVENTION_CFGF) {
        IMMEDIATELY_UNDO_RM('A'); new_line; return;
    }
    if (IterationsOfTurnSequence == 0) { IMMEDIATELY_UNDO_RM('B'); new_line; return; }
    if (undo_flag == 0) { IMMEDIATELY_UNDO_RM('C'); new_line; return; }
    if (undo_flag == 1) { IMMEDIATELY_UNDO_RM('D'); new_line; return; }
    if (VM_Undo() == 0) { IMMEDIATELY_UNDO_RM('F'); new_line; }
];

§6. Verify The Story File Rule. This is a fossil now, really, but in the days of Infocom, the 110K story file occupying an entire disc was a huge data set: floppy discs were by no means a reliable medium, and cheap hardware often used hit-and-miss components, as on the notorious Commodore 64 disc controller. If somebody experienced an apparent bug in play, it could easily be that he had a corrupt disc or was unable to read data of that density. So the VERIFY command, which took up to ten minutes on some early computers, would chug through the entire story file and compute a checksum, compare it against a known result in the header, and determine that the story file could or could not properly be read.

[ VERIFY_THE_STORY_FILE_R;
    if (actor ~= player) rfalse;
    if (VM_Verify()) { VERIFY_THE_STORY_FILE_RM('A'); new_line; }
    else { VERIFY_THE_STORY_FILE_RM('B'); new_line; }
];

§7. Switch Transcript On Rule.

[ SWITCH_TRANSCRIPT_ON_R;
    if (actor ~= player) rfalse;
    if (VM_TranscriptIsOn()) { SWITCH_TRANSCRIPT_ON_RM('A'); new_line; rtrue; }
    if (VM_TranscriptOn() == false) { SWITCH_TRANSCRIPT_ON_RM('C'); new_line; rtrue; }
    SWITCH_TRANSCRIPT_ON_RM('B'); new_line; VersionSub();
];

§8. Switch Transcript Off Rule.

[ SWITCH_TRANSCRIPT_OFF_R;
    if (actor ~= player) rfalse;
    if (VM_TranscriptIsOn() == false) { SWITCH_TRANSCRIPT_OFF_RM('A'); new_line; rtrue; }
    SWITCH_TRANSCRIPT_OFF_RM('B'); new_line;
    if (VM_TranscriptOff() == false) { SWITCH_TRANSCRIPT_ON_RM('C'); new_line; rtrue; }
];

§9. Announce Story File Version Rule.

[ ANNOUNCE_STORY_FILE_VERSION_R ix;
    if (actor ~= player) rfalse;
    Banner();
    print "Inform 7 v", (PrintI6Text) I7_FULL_VERSION_NUMBER, "^";
    if (UUID_ARRAY->0 >= 6) {
        print "Identification number: ";
        for (ix=6: ix <= UUID_ARRAY->0: ix++) print (char) UUID_ARRAY->ix;
        print "^";
    }
    VM_ReportOnInterpreter();
    ShowExtensionVersions();
    say__p = 1;
];