From 2529e1432a239d3f345e148cbca7b27b49d0dc98 Mon Sep 17 00:00:00 2001
From: AJR <ajrhacker@users.noreply.github.com>
Date: Fri, 19 Apr 2019 17:06:25 -0400
Subject: [PATCH] hd63450: Update IRQ output when enable bit changes (nw)

---
 src/devices/machine/hd63450.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/devices/machine/hd63450.cpp b/src/devices/machine/hd63450.cpp
index 44343895fa9..85cf00bfa86 100644
--- a/src/devices/machine/hd63450.cpp
+++ b/src/devices/machine/hd63450.cpp
@@ -206,6 +206,10 @@ WRITE16_MEMBER(hd63450_device::write)
 				dma_transfer_halt(channel);
 			if (data & 0x0040)  // continure operation
 				dma_transfer_continue(channel);
+			if ((data & 0x0008) == 0)
+				clear_irq(channel);
+			else if ((m_reg[channel].csr & 0xf2) != 0)
+				set_irq(channel);
 			LOG("DMA#%i: Channel Control write : %02x\n",channel,m_reg[channel].ccr);
 		}
 		break;