give "a" partition a ufs type by default

src/etc/etc.mac68k/disktab

@@ -111,6 +111,6 @@ sd650|mo650|mo650-ansi|HP6300/650A Magneto-optical with ANSI format drive:\
 # RAM disk
 ram:\
 	:ty=winchester:ns#512:nt#4:nc#1:\
-	:pa#2048:oa#0:ba#4096:fa#512:\
+	:pa#2048:oa#0:ba#4096:fa#512:ta=4.2BSD:ba#4096:fa#512: \
 	:pb#2048:ob#0:bb#4096:fb#512:\
 	:pc#2048:oc#0:bc#4096:fc#512:

src/etc/etc.vax/disktab

@@ -1,4 +1,4 @@
-#	$OpenBSD: disktab,v 1.2 1996/03/28 18:24:41 niklas Exp $
+#	$OpenBSD: disktab,v 1.3 1996/12/22 01:50:17 deraadt Exp $
 #	$NetBSD: disktab,v 1.2 1996/03/05 12:01:53 ragge Exp $
 #
 #	@(#)disktab	8.1 (Berkeley) 6/9/93
@@ -500,7 +500,7 @@ bootroot|fake-type used in install boot:\
 
 miniroot|fake-type used when installation:\
 	:ty=fake:se#512:nt#1:rm#3600:ns#2048:nc#1:\
-	:pa#4096:oa#0:ba#4096:fa#512:\
+	:pa#4096:oa#0:ba#4096:fa#512:ta=4.2BSD:ba#4096:fa#512: \
 	:pb#4096:ob#0:bb#4096:fb#512:\
 	:pc#4096:oc#0:bc#4096:fc#512: