diff --git a/drivers/memory/ramdisk/proto b/drivers/memory/ramdisk/proto
index bbe4c0bb8..2fd3fea7d 100644
--- a/drivers/memory/ramdisk/proto
+++ b/drivers/memory/ramdisk/proto
@@ -1,5 +1,5 @@
 boot 
-125 400
+130 400
 d--755 0 0
 	bin d--755 0 0
 		at_wini ---755 0 0 at_wini
diff --git a/include/minix/devio.h b/include/minix/devio.h
index ae8918c32..e123f8521 100644
--- a/include/minix/devio.h
+++ b/include/minix/devio.h
@@ -24,8 +24,17 @@ typedef struct { u16_t port; u16_t value; } pvw_pair_t;
 typedef struct { u16_t port; u32_t value; } pvl_pair_t;
 
 /* Macro shorthand to set (port,value)-pair. */
-#define pv_set(pv, p, v) ((pv).port = (p), (pv).value = (v))
-#define pv_ptr_set(pv_ptr, p, v) ((pv_ptr)->port = (p), (pv_ptr)->value = (v))
+#define pv_set(pv, p, v) do {					\
+	u32_t _p = (p), _v = (v);				\
+	(pv).port = _p;						\
+	(pv).value = _v;					\
+	if((pv).port != _p || (pv).value != _v) {		\
+		printf("%s:%d: actual port: %x != %x || "	\
+			"actual value: %x != %x\n",		\
+			__FILE__, __LINE__, (pv).port, _p, (pv).value, _v); \
+		panic(__FILE__, "pv_set(" #pv ", " #p ", " #v ")", NO_NUM); \
+	}							\
+} while(0)
 
 #if 0	/* no longer in use !!! */
 /* Define a number of flags to indicate granularity we are using. */
diff --git a/servers/rs/Makefile b/servers/rs/Makefile
index f644950f9..94f466551 100644
--- a/servers/rs/Makefile
+++ b/servers/rs/Makefile
@@ -27,7 +27,7 @@ $(UTIL):	$(UTIL_OBJ)
 	$(CC) -o $@ $(LDFLAGS) $(UTIL_OBJ) $(UTIL_LIBS)
 $(SERVER):	$(OBJ)
 	$(CC) -o $@ $(LDFLAGS) $(OBJ) $(LIBS)
-	install -S 110k $@
+	install -S 120k $@
 
 # install with other servers
 install:	/bin/$(UTIL) /usr/sbin/$(SERVER)
diff --git a/servers/rs/service.c b/servers/rs/service.c
index b2d1f48a4..0cca65781 100644
--- a/servers/rs/service.c
+++ b/servers/rs/service.c
@@ -235,6 +235,7 @@ PRIVATE int parse_arguments(int argc, char **argv)
           }
           else if (strcmp(argv[i], ARG_DEV)==0) {
               if (stat(argv[i+1], &stat_buf) == -1) {
+		  perror(argv[i+1]);
                   print_usage(argv[ARG_NAME], "couldn't get status of device");
                   exit(errno);
               }