diff --git a/src/db/Makefile.Host b/src/db/Makefile.Host
new file mode 100644
index 000000000..8c3110d54
--- /dev/null
+++ b/src/db/Makefile.Host
@@ -0,0 +1,31 @@
+#	Makefile.Host  for  base/src/db
+#
+#
+
+TOP = ../../..
+include $(TOP)/config/CONFIG_BASE
+
+#       includes to install from this sub-project
+#
+INC += drvTS.h
+INC += drvSup.h
+INC += callback.h
+INC += dbLock.h
+INC += dbAccess.h
+INC += dbConvert.h
+INC += dbEvent.h
+INC += dbScan.h
+INC += db_access.h
+INC += dbAddr.h
+INC += db_field_log.h
+INC += fast_lock.h
+INC += initHooks.h
+INC += recSup.h
+INC += devSup.h
+INC += taskwd.h
+INC += recGbl.h
+INC += dbBkpt.h
+INC += devLib.h
+
+include $(TOP)/config/RULES.Host
+
diff --git a/src/db/dbAccess.c b/src/db/dbAccess.c
index 768be3a63..17d318490 100644
--- a/src/db/dbAccess.c
+++ b/src/db/dbAccess.c
@@ -326,6 +326,9 @@ static void getOptions(DBADDR *paddr,void **poriginal,long *options,void *pflin)
 	pcommon = (dbCommon *)(paddr->precord);
 	if( (*options) & DBR_STATUS ) {
 	    if(pfl!=NULL) {
+		/* This gives warning:
+		 * ANSI C forbids use of cast expressions as lvalues
+		 */
 		*((unsigned short *)pbuffer)++ = pfl->stat;
 		*((unsigned short *)pbuffer)++ = pfl->sevr;
 	    } else {
diff --git a/src/db/devLib.c b/src/db/devLib.c
index dc3af1333..c4dfd951b 100644
--- a/src/db/devLib.c
+++ b/src/db/devLib.c
@@ -79,12 +79,16 @@ LOCAL LIST addrFree[atLast];
 LOCAL void	*addrLast[atLast] = {
 			(void *) 0xffff,
 			(void *) 0xffffff,
-			(void *) 0xffffffff};
+			(void *) 0xffffffff,
+			(void *) 0xffffff
+			};
 
 LOCAL long	addrFail[atLast] = {
 			S_dev_badA16,
 			S_dev_badA24,
-			S_dev_badA32};
+			S_dev_badA32,
+			S_dev_badA24
+			};
 
 LOCAL FAST_LOCK	addrListLock;
 LOCAL char	addrListInit;
@@ -421,27 +425,34 @@ void			**ppLocalAddress)
 		int 	s1;
 		int 	s2;
 
-		s1 = sysBusToLocalAdrs(
+		if (EPICStovxWorksAddrType[addrType] == EPICSAddrTypeNoConvert)
+		{
+			*ppLocalAddress = pFirst;
+		}
+		else
+		{
+			s1 = sysBusToLocalAdrs(
 	               	        EPICStovxWorksAddrType[addrType],
 	                        pLast,
 	                        &pAddr);
-        	s2 = sysBusToLocalAdrs(
+			s2 = sysBusToLocalAdrs(
 	               	        EPICStovxWorksAddrType[addrType],
 	                        pFirst,
 	                        &pAddr);
-		if(s1 || s2){
-			errPrintf(
-				S_dev_vxWorksAddrMapFail,
-				__FILE__,
-				__LINE__,
-				"%s base=0X %X size = 0X %X",
-				epicsAddressTypeName[addrType],
-				pFirst,
-				pLast-pFirst+1);
-               	 	return S_dev_vxWorksAddrMapFail;
-		}
+			if(s1 || s2){
+				errPrintf(
+					S_dev_vxWorksAddrMapFail,
+					__FILE__,
+					__LINE__,
+					"%s base=0X %X size = 0X %X",
+					epicsAddressTypeName[addrType],
+					pFirst,
+					pLast-pFirst+1);
+				return S_dev_vxWorksAddrMapFail;
+			}
 
-		*ppLocalAddress = (void *) pAddr;
+			*ppLocalAddress = (void *) pAddr;
+		}
 	}
 
 	/*
@@ -1175,12 +1186,19 @@ char			*pLocation
 	 * every byte in the block must 
 	 * map to a physical address
 	 */
-	s = sysBusToLocalAdrs(
+	if (EPICStovxWorksAddrType[addrType] == EPICSAddrTypeNoConvert)
+	{
+		pPhysical = pLocation;
+	}
+	else
+	{
+		s = sysBusToLocalAdrs(
              	        EPICStovxWorksAddrType[addrType],
 			pLocation,
                         &pPhysical);
-	if(s<0){
-		return S_dev_vxWorksAddrMapFail;
+		if(s<0){
+			return S_dev_vxWorksAddrMapFail;
+		}
 	}
 
 
diff --git a/src/db/devLib.h b/src/db/devLib.h
index b3f92b4ce..7e94ad734 100644
--- a/src/db/devLib.h
+++ b/src/db/devLib.h
@@ -70,7 +70,8 @@ typedef enum {
 		atVMEA16,
 		atVMEA24,
 		atVMEA32,
-		atLast /* atLast must be the last enum in this list */
+		atISA,	/* memory mapped ISA access (until now only on PC) */
+		atLast	/* atLast must be the last enum in this list */
 		} epicsAddressType;
 	
 #ifdef devLibGlobal
@@ -78,7 +79,8 @@ char	*epicsAddressTypeName[]
 		= {
 		"VME A16",
 		"VME A24",
-		"VME A32"
+		"VME A32",
+		"ISA"
 	};
 #endif
 
@@ -90,13 +92,15 @@ char	*epicsAddressTypeName[]
  * we assume that the BSP are configured to use these
  * address modes by default
  */
+#define EPICSAddrTypeNoConvert        -1
 #ifdef devLibGlobal
 int EPICStovxWorksAddrType[] 
                 = {
                 VME_AM_SUP_SHORT_IO,
                 VME_AM_STD_SUP_DATA,
-                VME_AM_EXT_SUP_DATA
-                };
+                VME_AM_EXT_SUP_DATA,
+                EPICSAddrTypeNoConvert
+	        };
 #endif
 
 long	devAddressMap(void); /* print an address map */
diff --git a/src/vxWorks/db/devLib.c b/src/vxWorks/db/devLib.c
index dc3af1333..c4dfd951b 100644
--- a/src/vxWorks/db/devLib.c
+++ b/src/vxWorks/db/devLib.c
@@ -79,12 +79,16 @@ LOCAL LIST addrFree[atLast];
 LOCAL void	*addrLast[atLast] = {
 			(void *) 0xffff,
 			(void *) 0xffffff,
-			(void *) 0xffffffff};
+			(void *) 0xffffffff,
+			(void *) 0xffffff
+			};
 
 LOCAL long	addrFail[atLast] = {
 			S_dev_badA16,
 			S_dev_badA24,
-			S_dev_badA32};
+			S_dev_badA32,
+			S_dev_badA24
+			};
 
 LOCAL FAST_LOCK	addrListLock;
 LOCAL char	addrListInit;
@@ -421,27 +425,34 @@ void			**ppLocalAddress)
 		int 	s1;
 		int 	s2;
 
-		s1 = sysBusToLocalAdrs(
+		if (EPICStovxWorksAddrType[addrType] == EPICSAddrTypeNoConvert)
+		{
+			*ppLocalAddress = pFirst;
+		}
+		else
+		{
+			s1 = sysBusToLocalAdrs(
 	               	        EPICStovxWorksAddrType[addrType],
 	                        pLast,
 	                        &pAddr);
-        	s2 = sysBusToLocalAdrs(
+			s2 = sysBusToLocalAdrs(
 	               	        EPICStovxWorksAddrType[addrType],
 	                        pFirst,
 	                        &pAddr);
-		if(s1 || s2){
-			errPrintf(
-				S_dev_vxWorksAddrMapFail,
-				__FILE__,
-				__LINE__,
-				"%s base=0X %X size = 0X %X",
-				epicsAddressTypeName[addrType],
-				pFirst,
-				pLast-pFirst+1);
-               	 	return S_dev_vxWorksAddrMapFail;
-		}
+			if(s1 || s2){
+				errPrintf(
+					S_dev_vxWorksAddrMapFail,
+					__FILE__,
+					__LINE__,
+					"%s base=0X %X size = 0X %X",
+					epicsAddressTypeName[addrType],
+					pFirst,
+					pLast-pFirst+1);
+				return S_dev_vxWorksAddrMapFail;
+			}
 
-		*ppLocalAddress = (void *) pAddr;
+			*ppLocalAddress = (void *) pAddr;
+		}
 	}
 
 	/*
@@ -1175,12 +1186,19 @@ char			*pLocation
 	 * every byte in the block must 
 	 * map to a physical address
 	 */
-	s = sysBusToLocalAdrs(
+	if (EPICStovxWorksAddrType[addrType] == EPICSAddrTypeNoConvert)
+	{
+		pPhysical = pLocation;
+	}
+	else
+	{
+		s = sysBusToLocalAdrs(
              	        EPICStovxWorksAddrType[addrType],
 			pLocation,
                         &pPhysical);
-	if(s<0){
-		return S_dev_vxWorksAddrMapFail;
+		if(s<0){
+			return S_dev_vxWorksAddrMapFail;
+		}
 	}
 
 
diff --git a/src/vxWorks/db/devLib.h b/src/vxWorks/db/devLib.h
index b3f92b4ce..7e94ad734 100644
--- a/src/vxWorks/db/devLib.h
+++ b/src/vxWorks/db/devLib.h
@@ -70,7 +70,8 @@ typedef enum {
 		atVMEA16,
 		atVMEA24,
 		atVMEA32,
-		atLast /* atLast must be the last enum in this list */
+		atISA,	/* memory mapped ISA access (until now only on PC) */
+		atLast	/* atLast must be the last enum in this list */
 		} epicsAddressType;
 	
 #ifdef devLibGlobal
@@ -78,7 +79,8 @@ char	*epicsAddressTypeName[]
 		= {
 		"VME A16",
 		"VME A24",
-		"VME A32"
+		"VME A32",
+		"ISA"
 	};
 #endif
 
@@ -90,13 +92,15 @@ char	*epicsAddressTypeName[]
  * we assume that the BSP are configured to use these
  * address modes by default
  */
+#define EPICSAddrTypeNoConvert        -1
 #ifdef devLibGlobal
 int EPICStovxWorksAddrType[] 
                 = {
                 VME_AM_SUP_SHORT_IO,
                 VME_AM_STD_SUP_DATA,
-                VME_AM_EXT_SUP_DATA
-                };
+                VME_AM_EXT_SUP_DATA,
+                EPICSAddrTypeNoConvert
+	        };
 #endif
 
 long	devAddressMap(void); /* print an address map */