diff --git a/design_dump.cc b/design_dump.cc
index 866fe99a6..56baa851b 100644
--- a/design_dump.cc
+++ b/design_dump.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: design_dump.cc,v 1.112 2001/04/22 23:09:46 steve Exp $"
+#ident "$Id: design_dump.cc,v 1.113 2001/04/29 20:19:10 steve Exp $"
 #endif
 
 /*
@@ -298,6 +298,12 @@ void NetLogic::dump_node(ostream&o, unsigned ind) const
 	  case OR:
 	    o << "or";
 	    break;
+	  case PULLDOWN:
+	    o << "pulldown";
+	    break;
+	  case PULLUP:
+	    o << "pullup";
+	    break;
 	  case RNMOS:
 	    o << "rnmos";
 	    break;
@@ -936,6 +942,9 @@ void Design::dump(ostream&o) const
 
 /*
  * $Log: design_dump.cc,v $
+ * Revision 1.113  2001/04/29 20:19:10  steve
+ *  Add pullup and pulldown devices.
+ *
  * Revision 1.112  2001/04/22 23:09:46  steve
  *  More UDP consolidation from Stephan Boettcher.
  *
diff --git a/elaborate.cc b/elaborate.cc
index 308fb6803..2b2e33fe4 100644
--- a/elaborate.cc
+++ b/elaborate.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: elaborate.cc,v 1.212 2001/04/28 23:18:08 steve Exp $"
+#ident "$Id: elaborate.cc,v 1.213 2001/04/29 20:19:10 steve Exp $"
 #endif
 
 /*
@@ -335,6 +335,14 @@ void PGBuiltin::elaborate(Design*des, const string&path) const
 		  cur[idx] = new NetLogic(scope, inm, pin_count(),
 					  NetLogic::PMOS);
 		  break;
+		case PULLDOWN:
+		  cur[idx] = new NetLogic(scope, inm, pin_count(),
+					  NetLogic::PULLDOWN);
+		  break;
+		case PULLUP:
+		  cur[idx] = new NetLogic(scope, inm, pin_count(),
+					  NetLogic::PULLUP);
+		  break;
 		case XNOR:
 		  cur[idx] = new NetLogic(scope, inm, pin_count(),
 					  NetLogic::XNOR);
@@ -2307,6 +2315,9 @@ Design* elaborate(const map<string,Module*>&modules,
 
 /*
  * $Log: elaborate.cc,v $
+ * Revision 1.213  2001/04/29 20:19:10  steve
+ *  Add pullup and pulldown devices.
+ *
  * Revision 1.212  2001/04/28 23:18:08  steve
  *  UDP instances need not have user supplied names.
  *
diff --git a/ivl_target.h b/ivl_target.h
index fd7c9f466..712049695 100644
--- a/ivl_target.h
+++ b/ivl_target.h
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: ivl_target.h,v 1.55 2001/04/26 05:12:02 steve Exp $"
+#ident "$Id: ivl_target.h,v 1.56 2001/04/29 20:19:10 steve Exp $"
 #endif
 
 #ifdef __cplusplus
@@ -174,6 +174,8 @@ typedef enum ivl_logic_e {
       IVL_LO_NOTIF0,
       IVL_LO_NOTIF1,
       IVL_LO_OR,
+      IVL_LO_PULLDOWN,
+      IVL_LO_PULLUP,
       IVL_LO_RNMOS,
       IVL_LO_RPMOS,
       IVL_LO_PMOS,
@@ -792,6 +794,9 @@ _END_DECL
 
 /*
  * $Log: ivl_target.h,v $
+ * Revision 1.56  2001/04/29 20:19:10  steve
+ *  Add pullup and pulldown devices.
+ *
  * Revision 1.55  2001/04/26 05:12:02  steve
  *  Implement simple MUXZ for ?: operators.
  *
diff --git a/netlist.h b/netlist.h
index b32767870..627339438 100644
--- a/netlist.h
+++ b/netlist.h
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: netlist.h,v 1.204 2001/04/24 02:23:58 steve Exp $"
+#ident "$Id: netlist.h,v 1.205 2001/04/29 20:19:10 steve Exp $"
 #endif
 
 /*
@@ -995,12 +995,17 @@ class NetConst  : public NetNode {
  *       0  -- output
  *       1  -- input data
  *       2  -- enable
+ *
+ * The pullup and pulldown gates have no inputs at all, and pin0 is
+ * the output 1 or 0, depending on the gate type. It is the strength
+ * of that value that is important.
  */
 class NetLogic  : public NetNode {
 
     public:
-      enum TYPE { AND, BUF, BUFIF0, BUFIF1, NAND, NMOS, NOR, NOT, NOTIF0,
-		  NOTIF1, OR, RNMOS, RPMOS, PMOS, XNOR, XOR };
+      enum TYPE { AND, BUF, BUFIF0, BUFIF1, NAND, NMOS, NOR, NOT,
+		  NOTIF0, NOTIF1, OR, PULLDOWN, PULLUP, RNMOS, RPMOS,
+		  PMOS, XNOR, XOR };
 
       explicit NetLogic(NetScope*s, const string&n, unsigned pins, TYPE t);
 
@@ -2802,6 +2807,9 @@ extern ostream& operator << (ostream&, NetNet::Type);
 
 /*
  * $Log: netlist.h,v $
+ * Revision 1.205  2001/04/29 20:19:10  steve
+ *  Add pullup and pulldown devices.
+ *
  * Revision 1.204  2001/04/24 02:23:58  steve
  *  Support for UDP devices in VVP (Stephen Boettcher)
  *
diff --git a/t-dll.cc b/t-dll.cc
index 3cb5b4091..fae87916d 100644
--- a/t-dll.cc
+++ b/t-dll.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: t-dll.cc,v 1.36 2001/04/26 05:12:02 steve Exp $"
+#ident "$Id: t-dll.cc,v 1.37 2001/04/29 20:19:10 steve Exp $"
 #endif
 
 # include  "compiler.h"
@@ -366,6 +366,12 @@ void dll_target::logic(const NetLogic*net)
 	  case NetLogic::OR:
 	    obj->type_ = IVL_LO_OR;
 	    break;
+	  case NetLogic::PULLDOWN:
+	    obj->type_ = IVL_LO_PULLDOWN;
+	    break;
+	  case NetLogic::PULLUP:
+	    obj->type_ = IVL_LO_PULLUP;
+	    break;
 	  case NetLogic::RNMOS:
 	    obj->type_ = IVL_LO_RNMOS;
 	    break;
@@ -879,6 +885,9 @@ extern const struct target tgt_dll = { "dll", &dll_target_obj };
 
 /*
  * $Log: t-dll.cc,v $
+ * Revision 1.37  2001/04/29 20:19:10  steve
+ *  Add pullup and pulldown devices.
+ *
  * Revision 1.36  2001/04/26 05:12:02  steve
  *  Implement simple MUXZ for ?: operators.
  *