diff --git a/config.guess b/config.guess
index 73139dd..105c103 100755
--- a/config.guess
+++ b/config.guess
@@ -214,11 +214,23 @@ EOF
     hp8??:OSF1:*:*)
 	echo hppa1.0-hp-osf
 	exit 0 ;;
-    C1*:ConvexOS:*:* | convex:ConvexOS:C1:*)
+    C1*:ConvexOS:*:* | convex:ConvexOS:C1*:*)
 	echo c1-convex-bsd
         exit 0 ;;
-    C2*:ConvexOS:*:* | convex:ConvexOS:C2:*)
-	echo c2-convex-bsd
+    C2*:ConvexOS:*:* | convex:ConvexOS:C2*:*)
+	if getsysinfo -f scalar_acc
+	then echo c32-convex-bsd
+	else echo c2-convex-bsd
+	fi
+        exit 0 ;;
+    C34*:ConvexOS:*:* | convex:ConvexOS:C34*:*)
+	echo c34-convex-bsd
+        exit 0 ;;
+    C38*:ConvexOS:*:* | convex:ConvexOS:C38*:*)
+	echo c38-convex-bsd
+        exit 0 ;;
+    C4*:ConvexOS:*:* | convex:ConvexOS:C4*:*)
+	echo c4-convex-bsd
         exit 0 ;;
     CRAY*X-MP:UNICOS:*:*)
 	echo xmp-cray-unicos