diff --git a/vvp/README.txt b/vvp/README.txt
index b13fc158b..d38bd4e53 100644
--- a/vvp/README.txt
+++ b/vvp/README.txt
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2001 Stephen Williams (steve@icarus.com)
  *
- *  $Id: README.txt,v 1.51 2004/12/31 06:00:06 steve Exp $
+ *  $Id: README.txt,v 1.52 2005/01/09 20:11:15 steve Exp $
  */
 
 VVP SIMULATION ENGINE
@@ -449,10 +449,19 @@ vector. The other inputs specify what those parts are, as a cannonical
 bit number, and a width. Normally, those bits are constant values.
 
 	<label> .part <symbol>, <base>, <wid>;
+	<label> .part/pv <symbol>, <base>, <wid>, <vector_wid>;
 
 The input is typically a .reg or .net, but can be any vector node in
 the netlist.
 
+The .part/pv variation is the inverse of the .part version, in that
+the output is actually written to a *part* of the output. The node
+uses special part-select-write functions to propagate a part of a
+network. The <vector_wid> is the total width of the destination net
+that part is written to. Destination nodes use this value to check
+further output widths.
+
+
 PART CONCATENATION STATEMENTS:
 
 The opposite of the part select statement is the part concatenation
diff --git a/vvp/compile.h b/vvp/compile.h
index 5447b8526..f44f05c3e 100644
--- a/vvp/compile.h
+++ b/vvp/compile.h
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: compile.h,v 1.58 2004/12/29 23:45:13 steve Exp $"
+#ident "$Id: compile.h,v 1.59 2005/01/09 20:11:15 steve Exp $"
 #endif
 
 # include  <stdio.h>
@@ -100,6 +100,9 @@ extern void compile_concat(char*label, unsigned w0, unsigned w1,
  */
 extern void compile_part_select(char*label, char*src,
 				unsigned base, unsigned wid);
+extern void compile_part_select_pv(char*label, char*src,
+				   unsigned base, unsigned wid,
+				   unsigned vec_wid);
 
 /*
  * This is called by the parser to make force functors.
@@ -282,6 +285,9 @@ extern void compile_net(char*label, char*name,
 
 /*
  * $Log: compile.h,v $
+ * Revision 1.59  2005/01/09 20:11:15  steve
+ *  Add the .part/pv node and related functionality.
+ *
  * Revision 1.58  2004/12/29 23:45:13  steve
  *  Add the part concatenation node (.concat).
  *
diff --git a/vvp/lexor.lex b/vvp/lexor.lex
index b0c47baa9..3ecc9bc77 100644
--- a/vvp/lexor.lex
+++ b/vvp/lexor.lex
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: lexor.lex,v 1.45 2004/12/29 23:45:13 steve Exp $"
+#ident "$Id: lexor.lex,v 1.46 2005/01/09 20:11:15 steve Exp $"
 #endif
 
 # include  "parse_misc.h"
@@ -103,6 +103,7 @@
 ".net/s"    { return K_NET_S; }
 ".param"    { return K_PARAM; }
 ".part"     { return K_PART; }
+".part/pv"  { return K_PART_PV; }
 ".resolv"   { return K_RESOLV; }
 ".scope"    { return K_SCOPE; }
 ".shift/l"  { return K_SHIFTL; }
@@ -184,6 +185,9 @@ int yywrap()
 
 /*
  * $Log: lexor.lex,v $
+ * Revision 1.46  2005/01/09 20:11:15  steve
+ *  Add the .part/pv node and related functionality.
+ *
  * Revision 1.45  2004/12/29 23:45:13  steve
  *  Add the part concatenation node (.concat).
  *
diff --git a/vvp/parse.y b/vvp/parse.y
index 2ee455c14..31f3d5939 100644
--- a/vvp/parse.y
+++ b/vvp/parse.y
@@ -1,7 +1,7 @@
 
 %{
 /*
- * Copyright (c) 2001-2003 Stephen Williams (steve@icarus.com)
+ * Copyright (c) 2001-2005 Stephen Williams (steve@icarus.com)
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: parse.y,v 1.62 2004/12/29 23:45:13 steve Exp $"
+#ident "$Id: parse.y,v 1.63 2005/01/09 20:11:15 steve Exp $"
 #endif
 
 # include  "parse_misc.h"
@@ -61,7 +61,7 @@ extern FILE*yyin;
 %token K_ARITH_SUB K_ARITH_SUM
 %token K_CMP_EQ K_CMP_NE K_CMP_GE K_CMP_GE_S K_CMP_GT K_CMP_GT_S
 %token K_CONCAT
-%token K_EVENT K_EVENT_OR K_FUNCTOR K_NET K_NET_S K_PARAM K_PART
+%token K_EVENT K_EVENT_OR K_FUNCTOR K_NET K_NET_S K_PARAM K_PART K_PART_PV
 %token K_RESOLV K_SCOPE K_SHIFTL K_SHIFTR K_THREAD K_TIMESCALE K_UFUNC
 %token K_UDP K_UDP_C K_UDP_S
 %token K_MEM K_MEM_P K_MEM_I
@@ -188,6 +188,9 @@ statement
 	| T_LABEL K_PART T_SYMBOL ',' T_NUMBER ',' T_NUMBER ';'
 		{ compile_part_select($1, $3, $5, $7); }
 
+	| T_LABEL K_PART_PV T_SYMBOL ',' T_NUMBER ',' T_NUMBER ',' T_NUMBER ';'
+		{ compile_part_select_pv($1, $3, $5, $7, $9); }
+
         | T_LABEL K_CONCAT '[' T_NUMBER T_NUMBER T_NUMBER T_NUMBER ']' ','
 	  symbols ';'
                 { compile_concat($1, $4, $5, $6, $7, $10.cnt, $10.vect); }
@@ -642,6 +645,9 @@ int compile_design(const char*path)
 
 /*
  * $Log: parse.y,v $
+ * Revision 1.63  2005/01/09 20:11:15  steve
+ *  Add the .part/pv node and related functionality.
+ *
  * Revision 1.62  2004/12/29 23:45:13  steve
  *  Add the part concatenation node (.concat).
  *
diff --git a/vvp/part.cc b/vvp/part.cc
index c8c08f3a4..27115db43 100644
--- a/vvp/part.cc
+++ b/vvp/part.cc
@@ -16,7 +16,7 @@
  *    along with this program; if not, write to the Free Software
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
-#ident "$Id: part.cc,v 1.2 2004/12/29 23:44:39 steve Exp $"
+#ident "$Id: part.cc,v 1.3 2005/01/09 20:11:16 steve Exp $"
 
 # include  "compile.h"
 # include  "vvp_net.h"
@@ -51,11 +51,28 @@ void vvp_fun_part::recv_vec4(vvp_net_ptr_t port, vvp_vector4_t bit)
       vvp_send_vec4(port.ptr()->out, res);
 }
 
-void compile_part_select(char*label, char*source,
-			 unsigned base, unsigned wid)
+vvp_fun_part_pv::vvp_fun_part_pv(unsigned b, unsigned w, unsigned v)
+: base_(b), wid_(w), vwid_(v)
 {
-      vvp_fun_part*fun = new vvp_fun_part(base, wid);
+}
 
+vvp_fun_part_pv::~vvp_fun_part_pv()
+{
+}
+
+void vvp_fun_part_pv::recv_vec4(vvp_net_ptr_t port, vvp_vector4_t bit)
+{
+      assert(port.port() == 0);
+      assert(bit.size() == wid_);
+      vvp_send_vec4_pv(port.ptr()->out, bit, base_, wid_, vwid_);
+}
+
+/*
+ * Given a node functor, create a network node and link it into the
+ * netlist. This form assumes nodes with a single input.
+ */
+void link_node_1(char*label, char*source, vvp_net_fun_t*fun)
+{
       vvp_net_t*net = new vvp_net_t;
       net->fun = fun;
 
@@ -65,8 +82,26 @@ void compile_part_select(char*label, char*source,
       input_connect(net, 0, source);
 }
 
+void compile_part_select(char*label, char*source,
+			 unsigned base, unsigned wid)
+{
+      vvp_fun_part*fun = new vvp_fun_part(base, wid);
+      link_node_1(label, source, fun);
+}
+
+void compile_part_select_pv(char*label, char*source,
+			    unsigned base, unsigned wid,
+			    unsigned vector_wid)
+{
+      vvp_fun_part_pv*fun = new vvp_fun_part_pv(base, wid, vector_wid);
+      link_node_1(label, source, fun);
+}
+
 /*
  * $Log: part.cc,v $
+ * Revision 1.3  2005/01/09 20:11:16  steve
+ *  Add the .part/pv node and related functionality.
+ *
  * Revision 1.2  2004/12/29 23:44:39  steve
  *  Fix missing output propagation of part node.
  *
diff --git a/vvp/resolv.cc b/vvp/resolv.cc
index d8723ac89..930641822 100644
--- a/vvp/resolv.cc
+++ b/vvp/resolv.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: resolv.cc,v 1.19 2004/12/31 06:00:06 steve Exp $"
+#ident "$Id: resolv.cc,v 1.20 2005/01/09 20:11:16 steve Exp $"
 #endif
 
 # include  "resolv.h"
@@ -41,6 +41,24 @@ void resolv_functor::recv_vec4(vvp_net_ptr_t port, vvp_vector4_t bit)
       recv_vec8(port, vvp_vector8_t(bit, 6 /* STRONG */));
 }
 
+void resolv_functor::recv_vec4_pv(vvp_net_ptr_t port, vvp_vector4_t bit,
+				  unsigned base, unsigned wid, unsigned vwid)
+{
+      assert(bit.size() == wid);
+      vvp_vector4_t res (vwid);
+
+      for (unsigned idx = 0 ;  idx < base ;  idx += 1)
+	    res.set_bit(idx, BIT4_Z);
+
+      for (unsigned idx = 0 ;  idx < wid ;  idx += 1)
+	    res.set_bit(idx+base, bit.value(idx));
+
+      for (unsigned idx = base+wid ;  idx < vwid ;  idx += 1)
+	    res.set_bit(idx, BIT4_Z);
+
+      recv_vec4(port, res);
+}
+
 void resolv_functor::recv_vec8(vvp_net_ptr_t port, vvp_vector8_t bit)
 {
       unsigned pdx = port.port();
@@ -65,6 +83,9 @@ void resolv_functor::recv_vec8(vvp_net_ptr_t port, vvp_vector8_t bit)
 
 /*
  * $Log: resolv.cc,v $
+ * Revision 1.20  2005/01/09 20:11:16  steve
+ *  Add the .part/pv node and related functionality.
+ *
  * Revision 1.19  2004/12/31 06:00:06  steve
  *  Implement .resolv functors, and stub signals recv_vec8 method.
  *
diff --git a/vvp/resolv.h b/vvp/resolv.h
index 4c2ab96a9..82a92b8a4 100644
--- a/vvp/resolv.h
+++ b/vvp/resolv.h
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: resolv.h,v 1.11 2005/01/01 02:12:34 steve Exp $"
+#ident "$Id: resolv.h,v 1.12 2005/01/09 20:11:16 steve Exp $"
 #endif
 
 # include  "config.h"
@@ -46,6 +46,9 @@ class resolv_functor : public vvp_net_fun_t {
       void recv_vec4(vvp_net_ptr_t port, vvp_vector4_t bit);
       void recv_vec8(vvp_net_ptr_t port, vvp_vector8_t bit);
 
+      void recv_vec4_pv(vvp_net_ptr_t port, vvp_vector4_t bit,
+			unsigned base, unsigned wid, unsigned vwid);
+
     private:
       vvp_vector8_t val_[4];
       vvp_scaler_t hiz_;
@@ -53,6 +56,9 @@ class resolv_functor : public vvp_net_fun_t {
 
 /*
  * $Log: resolv.h,v $
+ * Revision 1.12  2005/01/09 20:11:16  steve
+ *  Add the .part/pv node and related functionality.
+ *
  * Revision 1.11  2005/01/01 02:12:34  steve
  *  vvp_fun_signal propagates vvp_vector8_t vectors when appropriate.
  *
diff --git a/vvp/vvp_net.cc b/vvp/vvp_net.cc
index 5b9d2d067..e1c9a127c 100644
--- a/vvp/vvp_net.cc
+++ b/vvp/vvp_net.cc
@@ -16,7 +16,7 @@
  *    along with this program; if not, write to the Free Software
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
-#ident "$Id: vvp_net.cc,v 1.4 2005/01/01 02:12:34 steve Exp $"
+#ident "$Id: vvp_net.cc,v 1.5 2005/01/09 20:11:16 steve Exp $"
 
 # include  "vvp_net.h"
 # include  <stdio.h>
@@ -62,6 +62,19 @@ void vvp_send_vec4(vvp_net_ptr_t ptr, vvp_vector4_t val)
       }
 }
 
+void vvp_send_vec4_pv(vvp_net_ptr_t ptr, vvp_vector4_t val,
+		      unsigned base, unsigned wid, unsigned vwid)
+{
+      while (struct vvp_net_t*cur = ptr.ptr()) {
+	    vvp_net_ptr_t next = cur->port[ptr.port()];
+
+	    if (cur->fun)
+		  cur->fun->recv_vec4_pv(ptr, val, base, wid, vwid);
+
+	    ptr = next;
+      }
+}
+
 void vvp_send_vec8(vvp_net_ptr_t ptr, vvp_vector8_t val)
 {
       while (struct vvp_net_t*cur = ptr.ptr()) {
@@ -296,6 +309,14 @@ void vvp_net_fun_t::recv_vec4(vvp_net_ptr_t, vvp_vector4_t)
       assert(0);
 }
 
+void vvp_net_fun_t::recv_vec4_pv(vvp_net_ptr_t, vvp_vector4_t,
+				 unsigned, unsigned, unsigned)
+{
+      fprintf(stderr, "internal error: %s: recv_vec4_pv not implemented\n",
+	      typeid(*this).name());
+      assert(0);
+}
+
 void vvp_net_fun_t::recv_vec8(vvp_net_ptr_t, vvp_vector8_t)
 {
       fprintf(stderr, "internal error: %s: recv_vec8 not implemented\n",
@@ -644,6 +665,9 @@ vvp_vector4_t reduce4(const vvp_vector8_t&that)
 
 /*
  * $Log: vvp_net.cc,v $
+ * Revision 1.5  2005/01/09 20:11:16  steve
+ *  Add the .part/pv node and related functionality.
+ *
  * Revision 1.4  2005/01/01 02:12:34  steve
  *  vvp_fun_signal propagates vvp_vector8_t vectors when appropriate.
  *
diff --git a/vvp/vvp_net.h b/vvp/vvp_net.h
index b1d77396f..f30e7a5ef 100644
--- a/vvp/vvp_net.h
+++ b/vvp/vvp_net.h
@@ -18,7 +18,7 @@
  *    along with this program; if not, write to the Free Software
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
-#ident "$Id: vvp_net.h,v 1.5 2005/01/01 02:12:34 steve Exp $"
+#ident "$Id: vvp_net.h,v 1.6 2005/01/09 20:11:16 steve Exp $"
 
 # include  <assert.h>
 
@@ -266,6 +266,12 @@ extern void vvp_send_vec8(vvp_net_ptr_t ptr, vvp_vector8_t val);
 extern void vvp_send_real(vvp_net_ptr_t ptr, double val);
 extern void vvp_send_long(vvp_net_ptr_t ptr, long val);
 
+/*
+ * Part-vector versions of above functions.
+ */
+extern void vvp_send_vec4_pv(vvp_net_ptr_t ptr, vvp_vector4_t val,
+			     unsigned base, unsigned wid, unsigned vwid);
+
 /*
  * Instances of this class represent the functionality of a
  * node. vvp_net_t objects hold pointers to the vvp_net_fun_t
@@ -292,6 +298,10 @@ class vvp_net_fun_t {
       virtual void recv_real(vvp_net_ptr_t port, double bit);
       virtual void recv_long(vvp_net_ptr_t port, long bit);
 
+	// Part select variants of above
+      virtual void recv_vec4_pv(vvp_net_ptr_t p, vvp_vector4_t bit,
+				unsigned base, unsigned wid, unsigned vwid);
+
     private: // not implemented
       vvp_net_fun_t(const vvp_net_fun_t&);
       vvp_net_fun_t& operator= (const vvp_net_fun_t&);
@@ -301,9 +311,9 @@ class vvp_net_fun_t {
 
 /* vvp_fun_concat
  * This node function creates vectors (vvp_vector4_t) from the
- * concatenation of the inputs. The inputs (4) may be scalers or other
- * vectors. Scalers are turned into vectors of size==1 before
- * concatenating.
+ * concatenation of the inputs. The inputs (4) may be vector or
+ * vector8 objects, but they are reduced to vector4 values and
+ * strength information lost.
  *
  * The expected widths of the input vectors must be given up front so
  * that the positions in the output vector (and also the size of the
@@ -318,6 +328,7 @@ class vvp_fun_concat  : public vvp_net_fun_t {
       ~vvp_fun_concat();
 
       void recv_vec4(vvp_net_ptr_t port, vvp_vector4_t bit);
+      void recv_vec8(vvp_net_ptr_t port, vvp_vector8_t bit);
 
     private:
       unsigned wid_[4];
@@ -365,6 +376,26 @@ class vvp_fun_part  : public vvp_net_fun_t {
       unsigned wid_;
 };
 
+/* vvp_fun_part_pv
+ * This node takes a vector input and turns it into the part select of
+ * a wider output network. It used the recv_vec4_pv methods of the
+ * destination nodes to propagate the part select.
+ */
+class vvp_fun_part_pv  : public vvp_net_fun_t {
+
+    public:
+      vvp_fun_part_pv(unsigned base, unsigned wid, unsigned vec_wid);
+      ~vvp_fun_part_pv();
+
+    public:
+      void recv_vec4(vvp_net_ptr_t port, vvp_vector4_t bit);
+
+    private:
+      unsigned base_;
+      unsigned wid_;
+      unsigned vwid_;
+};
+
 /* vvp_fun_signal
  * This node is the place holder in a vvp network for signals,
  * including nets of various sort. The output from a signal follows
@@ -454,6 +485,9 @@ class vvp_fun_signal  : public vvp_net_fun_t {
 
 /*
  * $Log: vvp_net.h,v $
+ * Revision 1.6  2005/01/09 20:11:16  steve
+ *  Add the .part/pv node and related functionality.
+ *
  * Revision 1.5  2005/01/01 02:12:34  steve
  *  vvp_fun_signal propagates vvp_vector8_t vectors when appropriate.
  *