From c28eda27138cdbf6462316b0d8225d8c36c9c682 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Fri, 28 Jul 2017 02:36:49 +0200
Subject: [PATCH] Bus mouse now returns button status in READ_X_LOW as well,
 fixes bus mouse in AMI WinBIOS 486 CMOS Setup.

---
 src/mouse_bus.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/mouse_bus.c b/src/mouse_bus.c
index 5d20f2f31..ea315dd0d 100644
--- a/src/mouse_bus.c
+++ b/src/mouse_bus.c
@@ -155,7 +155,8 @@ static uint8_t busmouse_read(uint16_t port, void *priv)
 		switch (busmouse->control_val & 0x60)
 		{
 			case READ_X_LOW:
-			r = busmouse->x & 0x0f;
+			/* r = busmouse->x & 0x0f; */
+			r = ((busmouse->but ^ 7) << 5) | (busmouse->x & 0x0f);
 			break;
 			
 			case READ_X_HIGH: