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diff --git a/robots/move_robs.c b/robots/move_robs.c
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+/*
+ * Copyright (c) 1980 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)move_robs.c 5.5 (Berkeley) 2/28/91";
+#endif /* not lint */
+
+# include "robots.h"
+# include <signal.h>
+
+/*
+ * move_robots:
+ * Move the robots around
+ */
+void
+move_robots(was_sig)
+bool was_sig;
+{
+ register COORD *rp;
+ register int y, x;
+ register int mindist, d;
+ static COORD newpos;
+
+ if (Real_time)
+ signal(SIGALRM, move_robots);
+# ifdef DEBUG
+ move(Min.y, Min.x);
+ addch(inch());
+ move(Max.y, Max.x);
+ addch(inch());
+# endif DEBUG
+ for (rp = Robots; rp < &Robots[MAXROBOTS]; rp++) {
+ if (rp->y < 0)
+ continue;
+ mvaddch(rp->y, rp->x, ' ');
+ Field[rp->y][rp->x]--;
+ rp->y += sign(My_pos.y - rp->y);
+ rp->x += sign(My_pos.x - rp->x);
+ if (rp->y <= 0)
+ rp->y = 0;
+ else if (rp->y >= Y_FIELDSIZE)
+ rp->y = Y_FIELDSIZE - 1;
+ if (rp->x <= 0)
+ rp->x = 0;
+ else if (rp->x >= X_FIELDSIZE)
+ rp->x = X_FIELDSIZE - 1;
+ Field[rp->y][rp->x]++;
+ }
+
+ Min.y = Y_FIELDSIZE;
+ Min.x = X_FIELDSIZE;
+ Max.y = 0;
+ Max.x = 0;
+ for (rp = Robots; rp < &Robots[MAXROBOTS]; rp++)
+ if (rp->y < 0)
+ continue;
+ else if (rp->y == My_pos.y && rp->x == My_pos.x)
+ Dead = TRUE;
+ else if (Field[rp->y][rp->x] > 1) {
+ mvaddch(rp->y, rp->x, HEAP);
+ rp->y = -1;
+ Num_robots--;
+ if (Waiting)
+ Wait_bonus++;
+ add_score(ROB_SCORE);
+ }
+ else {
+ mvaddch(rp->y, rp->x, ROBOT);
+ if (rp->y < Min.y)
+ Min.y = rp->y;
+ if (rp->x < Min.x)
+ Min.x = rp->x;
+ if (rp->y > Max.y)
+ Max.y = rp->y;
+ if (rp->x > Max.x)
+ Max.x = rp->x;
+ }
+
+ if (was_sig) {
+ refresh();
+ if (Dead || Num_robots <= 0)
+ longjmp(End_move, 0);
+ }
+
+# ifdef DEBUG
+ standout();
+ move(Min.y, Min.x);
+ addch(inch());
+ move(Max.y, Max.x);
+ addch(inch());
+ standend();
+# endif DEBUG
+ if (Real_time)
+ alarm(3);
+}
+
+/*
+ * add_score:
+ * Add a score to the overall point total
+ */
+add_score(add)
+int add;
+{
+ Score += add;
+ move(Y_SCORE, X_SCORE);
+ printw("%d", Score);
+}
+
+/*
+ * sign:
+ * Return the sign of the number
+ */
+sign(n)
+int n;
+{
+ if (n < 0)
+ return -1;
+ else if (n > 0)
+ return 1;
+ else
+ return 0;
+}