$NetBSD: patch-as,v 1.1 2005/01/07 14:52:13 drochner Exp $

--- common.c.orig	1999-06-15 23:24:19.000000000 +0200
+++ common.c
@@ -123,7 +123,7 @@ int head_check(unsigned long head)
 	return FALSE;
     if(!((head>>17)&3))
 	return FALSE;
-    if( ((head>>12)&0xf) == 0xf)
+    if( ((head>>12)&0xf) == 0xf || ((head>>12)&0xf) == 0) 
 	return FALSE;
     if( ((head>>10)&0x3) == 0x3 )
 	return FALSE;