diff --git a/src/emu/machine/8257dma.c b/src/emu/machine/8257dma.c
index 1a762eecca5..55a20384e44 100644
--- a/src/emu/machine/8257dma.c
+++ b/src/emu/machine/8257dma.c
@@ -190,7 +190,7 @@ int i8257_device::i8257_do_operation(int channel)
 		}
 		if (&m_out_iow_func[channel].target != NULL)
 		{
-			devcb_call_write8(&m_out_iow_func[channel], 0, data);
+			devcb_call_write8(&m_out_iow_func[channel], m_address[channel], data);
 		}
 		else
 		{
@@ -205,7 +205,7 @@ int i8257_device::i8257_do_operation(int channel)
 	case 2:
 		if (&m_in_ior_func[channel].target != NULL)
 		{
-			data = devcb_call_read8(&m_in_ior_func[channel], 0);
+			data = devcb_call_read8(&m_in_ior_func[channel], m_address[channel]);
 		}
 		else
 		{
diff --git a/src/emu/machine/8257dma.h b/src/emu/machine/8257dma.h
index 9e912dcdda6..e4cf1593f75 100644
--- a/src/emu/machine/8257dma.h
+++ b/src/emu/machine/8257dma.h
@@ -67,8 +67,8 @@ struct i8257_interface
 	devcb_write_line	m_out_mark_func;
 
 	/* accessors to main memory */
-	devcb_read8			m_in_memr_func;
-	devcb_write8		m_out_memw_func;
+	devcb_read8			m_in_memr_func; // TODO m_in_memr_func[I8257_NUM_CHANNELS];
+	devcb_write8		m_out_memw_func; // TODO m_out_memw_func[I8257_NUM_CHANNELS];
 
 	/* channel accesors */
 	devcb_read8			m_in_ior_func[I8257_NUM_CHANNELS];