From 9737f41ad0ce8089800f8cccd152f0e8244842fb Mon Sep 17 00:00:00 2001
From: Dirk Best <mail@dirk-best.de>
Date: Thu, 17 Mar 2016 23:48:22 +0100
Subject: [PATCH] ins8250: don't clear THRE on write to the line status
 register

---
 src/devices/machine/ins8250.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/devices/machine/ins8250.cpp b/src/devices/machine/ins8250.cpp
index bbd0fee1584..e032039cb7d 100644
--- a/src/devices/machine/ins8250.cpp
+++ b/src/devices/machine/ins8250.cpp
@@ -316,7 +316,7 @@ WRITE8_MEMBER( ins8250_uart_device::ins8250_w )
 			  bits 5 - 0, you could cause an interrupt if the appropriate IER bit
 			  is set.
 			*/
-			m_regs.lsr = (m_regs.lsr & 0x40) | (data & ~0x40);
+			m_regs.lsr = (m_regs.lsr & 0x60) | (data & ~0x60);
 
 			tmp = 0;
 			tmp |= ( m_regs.lsr & 0x01 ) ? COM_INT_PENDING_RECEIVED_DATA_AVAILABLE : 0;