diff --git a/sys/dev/isa/isadma.c b/sys/dev/isa/isadma.c
index 95a03de24ddd..6ed1f4c1013a 100644
--- a/sys/dev/isa/isadma.c
+++ b/sys/dev/isa/isadma.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: isadma.c,v 1.39 1998/11/19 15:38:25 mrg Exp $	*/
+/*	$NetBSD: isadma.c,v 1.40 1999/02/22 02:32:43 mycroft Exp $	*/
 
 /*-
  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@@ -72,6 +72,10 @@ static u_int8_t dmamode[] = {
 	DMA37MD_READ | DMA37MD_SINGLE,
 	DMA37MD_WRITE | DMA37MD_SINGLE,
 
+	/* write to device/read from device */
+	DMA37MD_READ | DMA37MD_DEMAND,
+	DMA37MD_WRITE | DMA37MD_DEMAND,
+
 	/* write to device/read from device - DMAMODE_LOOP */
 	DMA37MD_READ | DMA37MD_SINGLE | DMA37MD_LOOP,
 	DMA37MD_WRITE | DMA37MD_SINGLE | DMA37MD_LOOP,
diff --git a/sys/dev/isa/isadmavar.h b/sys/dev/isa/isadmavar.h
index 9514ba348b6a..dbf86d744277 100644
--- a/sys/dev/isa/isadmavar.h
+++ b/sys/dev/isa/isadmavar.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: isadmavar.h,v 1.14 1998/06/28 06:59:36 thorpej Exp $	*/
+/*	$NetBSD: isadmavar.h,v 1.15 1999/02/22 02:32:43 mycroft Exp $	*/
 
 /*-
  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@@ -44,8 +44,10 @@
 
 #define	DMAMODE_WRITE		0x00
 #define	DMAMODE_READ		0x01
-#define	DMAMODE_LOOP		0x02
-#define	DMAMODE_LOOPDEMAND	0x04
+#define	DMAMODE_SINGLE		0x00
+#define	DMAMODE_DEMAND		0x02
+#define	DMAMODE_LOOP		0x04
+#define	DMAMODE_LOOPDEMAND	(DMAMODE_LOOP | DMAMODE_DEMAND)
 
 /*
  * ISA DMA state.  This structure is provided by the ISA chipset