diff --git a/sys/arch/pmax/ibus/ibus_pmax.c b/sys/arch/pmax/ibus/ibus_pmax.c
index 9dfcbcba12d7..7b47b03c0728 100644
--- a/sys/arch/pmax/ibus/ibus_pmax.c
+++ b/sys/arch/pmax/ibus/ibus_pmax.c
@@ -1,4 +1,4 @@
-/* $NetBSD: ibus_pmax.c,v 1.8 1999/11/24 00:18:37 simonb Exp $ */
+/* $NetBSD: ibus_pmax.c,v 1.9 1999/11/24 01:43:38 simonb Exp $ */
 
 /*
  * Copyright (c) 1998 Jonathan Stone.  All rights reserved.
@@ -32,7 +32,7 @@
 
 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: ibus_pmax.c,v 1.8 1999/11/24 00:18:37 simonb Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ibus_pmax.c,v 1.9 1999/11/24 01:43:38 simonb Exp $");
 
 #include "opt_dec_3100.h"
 #include "opt_dec_5100.h"
@@ -75,8 +75,10 @@ struct ibus_attach_args ibus_mipsmate_devs[] = {
 	{ "lance",	2,	KV(KN01_SYS_LANCE),		0	},
 	{ "sii",	3,	KV(KN01_SYS_SII),		0	},
 	{ "mc146818",	4,	KV(KN01_SYS_CLOCK),		0	},
+#if 0	/* 5100 locks up when these are probed at the moment */
 	{ "dc",		5,	KV(0x15000000),			2	},
 	{ "dc",		6,	KV(0x15200000),			2	},
+#endif
 #if 0
 	/*
 	 * Ultrix configures it at 0x86400400.  The first 0x400 bytes