diff --git a/src/circuit/ChangeLog b/src/circuit/ChangeLog
index bc6d059bf..e4c7f2912 100644
--- a/src/circuit/ChangeLog
+++ b/src/circuit/ChangeLog
@@ -1,3 +1,8 @@
+2000-05-21  Paolo Nenzi <p.nenzi@ieee.org>
+
+	* inp2r.c: Modified ac parameter parsing code to conform to
+	           spice parameter parsing format
+
 2000-04-04  Paolo Nenzi <p.nenzi@ieee.org>
     
 	* inpfindl.c: Modified the file for BSIM4 and future extensions to
diff --git a/src/circuit/inp2r.c b/src/circuit/inp2r.c
index 29b683436..8fdc81a2f 100644
--- a/src/circuit/inp2r.c
+++ b/src/circuit/inp2r.c
@@ -1,6 +1,10 @@
 /**********
 Copyright 1990 Regents of the University of California.  All rights reserved.
 Author: 1988 Thomas L. Quarles
+Modified: Paolo Nenzi 2000
+Remarks:  This code is based on a version written by Serban Popescu which
+          accepted an optional parameter ac. I have adapted his code
+	  to conform to INP standard. (PN)
 **********/
 
 #include "ngspice.h"
@@ -15,12 +19,12 @@ void
 INP2R(void *ckt, INPtables *tab, card *current)
 {
 /* parse a resistor card */
-/* serban */
 /* Rname <node> <node> [<val>][<mname>][w=<val>][l=<val>][ac=<val>] */
 
 int mytype; /* the type we determine resistors are */
 int type;   /* the type the model says it is */
 char *line; /* the part of the current line left to parse */
+char *saveline; /* ... just in case we need to go back... */
 char *name; /* the resistor's name */
 char *model;    /* the name of the resistor's model */
 char *nname1;   /* the first node's name */
@@ -28,12 +32,10 @@ char *nname2;   /* the second node's name */
 void *node1; /* the first node's node pointer */
 void *node2; /* the second node's node pointer */
 double val;     /* temp to held resistance */
-double acval;     /* temp to held resistance */
 int error;      /* error code temporary */
 int error1;     /* secondary error code temporary */
-int error2;     /* third error code temporary */
 INPmodel *thismodel;    /* pointer to model structure describing our model */
-void *mdfast;    /* pointer to the actual model */
+void *mdfast=NULL;     /* pointer to the actual model */
 void *fast;  /* pointer to the actual instance */
 IFvalue ptemp;  /* a value structure to package resistance into */
 int waslead;    /* flag to indicate that funny unlabeled number was found */
@@ -53,40 +55,40 @@ IFuid uid;      /* uid for default model */
     INPgetTok(&line,&nname2,1);
     INPtermInsert(ckt,&nname2,tab,&node2);
     val = INPevaluate(&line,&error1,1);
-    acval = val; /* PN: This is a safe choice */
     /* either not a number -> model, or
      * follows a number, so must be a model name
      * -> MUST be a model name (or null)
      */
-again:
+
+     saveline = line; /* save then old pointer */
+
     INPgetTok(&line,&model,1);
-    if(*model) { /* token isn't null */
-        if(!strcmp(model, "ac")) {
-            acval = INPevaluate(&line,&error2,1);
-            goto again;
-        } else {
-            INPinsert(&model,tab);
-            thismodel = (INPmodel *)NULL;
-            current->error = INPgetMod(ckt,model,&thismodel,tab);
-            if(thismodel != NULL) {
-                if(mytype != thismodel->INPmodType) {
-                    LITERR("incorrect model type")
-                    return;
-                }
-                mdfast = thismodel->INPmodfast;
-                type = thismodel->INPmodType;
-            } else {
-                type = mytype;
-                if(!tab->defRmod) {
-                    /* create default R model */
-                    IFnewUid(ckt,&uid,(IFuid)NULL,"R",UID_MODEL,(void **)NULL);
-                    IFC(newModel, (ckt,type,&(tab->defRmod),uid))
+    
+if(*model) { /* token isn't null */
+	if( INPlookMod(model) ) {  /* If this is a valid model connect it */
+	INPinsert(&model,tab);
+	thismodel = (INPmodel *)NULL;
+	current->error = INPgetMod(ckt,model,&thismodel,tab);
+		if(thismodel != NULL) {
+			if(mytype != thismodel->INPmodType) {
+			LITERR("incorrect model type")
+			return;
+			}
+		mdfast = thismodel->INPmodfast;
+		type = thismodel->INPmodType;
+		}
+	   
+	} else { /* It is not a model */
+		line = saveline;  /* go back */
+		type = mytype;
+                if(!tab->defRmod) { /* create default R model */
+			IFnewUid(ckt,&uid,(IFuid)NULL,"R",UID_MODEL,(void **)NULL);
+			IFC(newModel, (ckt,type,&(tab->defRmod),uid))
                 }
                 mdfast = tab->defRmod;
-            }
-            IFC(newInstance,(ckt,mdfast,&fast,name))
-        }
-    } else  {
+	      }
+	   IFC(newInstance,(ckt,mdfast,&fast,name))
+    } else {  /* The token is null and a default model will be created */
         type = mytype;
         if(!tab->defRmod) {
             /* create default R model */
@@ -95,15 +97,11 @@ again:
         }
         IFC(newInstance,(ckt,tab->defRmod,&fast,name))
     }
+
     if(error1 == 0) { /* got a resistance above */
         ptemp.rValue = val;
         GCA(INPpName,("resistance",&ptemp,ckt,type,fast))
     }
-    if(error2 == 0) { /* got an AC resistance above */
-        ptemp.rValue = acval;
-        GCA(INPpName,("ac",&ptemp,ckt,type,fast))
-    }
-
 
     IFC(bindNode,(ckt,fast,1,node1))
     IFC(bindNode,(ckt,fast,2,node2))