diff -cr ../nethack-3.3.1/include/hack.h ./include/hack.h
*** ../nethack-3.3.1/include/hack.h	Fri Sep 22 16:32:02 2000
--- ./include/hack.h	Fri Sep 22 14:24:47 2000
***************
*** 141,146 ****
--- 141,147 ----
  #define ALL_TYPES    0x10
  #define BILLED_TYPES 0x20
  #define CHOOSE_ALL   0x40
+ #define BUC_UNKNOWN  0x80
  #define ALL_TYPES_SELECTED -2
  
  /* Flags to control find_mid() */
diff -cr ../nethack-3.3.1/src/do.c ./src/do.c
*** ../nethack-3.3.1/src/do.c	Fri Sep 22 16:32:02 2000
--- ./src/do.c	Fri Sep 22 15:05:43 2000
***************
*** 553,558 ****
--- 553,559 ----
      menu_item *pick_list;
      boolean all_categories = TRUE;
      boolean drop_everything = FALSE;
+     boolean drop_buc_unknown = FALSE;
  
      if (u.ugold) {
  	/* Hack: gold is not in the inventory, so make a gold object
***************
*** 570,576 ****
  	all_categories = FALSE;
  	n = query_category("Drop what type of items?",
  			invent,
! 			UNPAID_TYPES | ALL_TYPES | CHOOSE_ALL,
  			&pick_list, PICK_ANY);
  	if (!n) goto drop_done;
  	for (i = 0; i < n; i++) {
--- 571,577 ----
  	all_categories = FALSE;
  	n = query_category("Drop what type of items?",
  			invent,
! 			UNPAID_TYPES | ALL_TYPES | CHOOSE_ALL | BUC_UNKNOWN,
  			&pick_list, PICK_ANY);
  	if (!n) goto drop_done;
  	for (i = 0; i < n; i++) {
***************
*** 578,583 ****
--- 579,586 ----
  		all_categories = TRUE;
  	    else if (pick_list[i].item.a_int == 'A')
  		drop_everything = TRUE;
+ 	    else if (pick_list[i].item.a_int == 'B')
+ 		drop_buc_unknown = TRUE;
  	    else
  		add_valid_menu_class(pick_list[i].item.a_int);
  	}
***************
*** 593,598 ****
--- 596,606 ----
  	for(otmp = invent; otmp; otmp = otmp2) {
  	    otmp2 = otmp->nobj;
  	    n_dropped += drop(otmp);
+ 	}
+     } else if (drop_buc_unknown) {
+ 	for(otmp = invent; otmp; otmp = otmp2) {
+ 	    otmp2 = otmp->nobj;
+ 	    if (!otmp->bknown)  n_dropped += drop(otmp);
  	}
      } else {
  	/* should coordinate with perm invent, maybe not show worn items */
diff -cr ../nethack-3.3.1/src/invent.c ./src/invent.c
*** ../nethack-3.3.1/src/invent.c	Fri Sep 22 16:32:02 2000
--- ./src/invent.c	Fri Sep 22 16:20:18 2000
***************
*** 1525,1530 ****
--- 1525,1547 ----
      return count;
  }
  
+ /*
+  * Returns the number of items with b/u/c unknown within the given list.  
+  * This does NOT include contained objects.
+  */
+ int
+ count_buc_unknown(list)
+     struct obj *list;
+ {
+     int count = 0;
+ 
+     while (list) {
+ 	if (!(list->bknown)) count++;
+ 	list = list->nobj;
+     }
+     return count;
+ }
+ 
  STATIC_OVL void
  dounpaid()
  {
diff -cr ../nethack-3.3.1/src/pickup.c ./src/pickup.c
*** ../nethack-3.3.1/src/pickup.c	Fri Sep 22 16:32:03 2000
--- ./src/pickup.c	Fri Sep 22 16:31:18 2000
***************
*** 662,675 ****
  	char invlet;
  	int ccount;
  	boolean do_unpaid = FALSE;
  
  	*pick_list = (menu_item *) 0;
  	if (!olist) return 0;
  	if ((qflags & UNPAID_TYPES) && count_unpaid(olist)) do_unpaid = TRUE;
  
  	ccount = count_categories(olist, qflags);
  	/* no point in actually showing a menu for a single category */
! 	if (ccount == 1 && !do_unpaid && !(qflags & BILLED_TYPES)) {
  	    for (curr = olist; curr; curr = FOLLOW(curr, qflags)) {
  		if ((qflags & WORN_TYPES) &&
  		    !(curr->owornmask & (W_ARMOR|W_RING|W_AMUL|W_TOOL|W_WEP|W_SWAPWEP|W_QUIVER)))
--- 662,677 ----
  	char invlet;
  	int ccount;
  	boolean do_unpaid = FALSE;
+ 	boolean do_buc_unknown = FALSE;
  
  	*pick_list = (menu_item *) 0;
  	if (!olist) return 0;
  	if ((qflags & UNPAID_TYPES) && count_unpaid(olist)) do_unpaid = TRUE;
+ 	if ((qflags & BUC_UNKNOWN) && count_buc_unknown(olist)) do_buc_unknown = TRUE;
  
  	ccount = count_categories(olist, qflags);
  	/* no point in actually showing a menu for a single category */
! 	if (ccount == 1 && !do_unpaid && !do_buc_unknown && !(qflags & BILLED_TYPES)) {
  	    for (curr = olist; curr; curr = FOLLOW(curr, qflags)) {
  		if ((qflags & WORN_TYPES) &&
  		    !(curr->owornmask & (W_ARMOR|W_RING|W_AMUL|W_TOOL|W_WEP|W_SWAPWEP|W_QUIVER)))
***************
*** 750,755 ****
--- 752,765 ----
  			(qflags & WORN_TYPES) ?
  			"Auto-select every item being worn" :
  			"Auto-select every item", MENU_UNSELECTED);
+ 	}
+ 	/* items with b/u/c unknown if there are any */
+ 	if (do_buc_unknown) {
+ 		invlet = 'B';
+ 		any.a_void = 0;
+ 		any.a_int = 'B';
+ 		add_menu(win, NO_GLYPH, &any, invlet, 0, ATR_NONE,
+ 			"b/u/c unknown", MENU_UNSELECTED);
  	}
  	end_menu(win, qstr);
  	n = select_menu(win, how, pick_list);