From 0f2301c9bf5eeea55a8d2c326319a3b32304acc0 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Fri, 28 Apr 2023 23:38:55 +0200
Subject: [PATCH] The SiS 50x now initializes the PS/2 keyboard and mouse IRQ
 latch if a PS/2 keyboard controller is present, needed for the AMI WinBIOS
 CMOS setup on the Excalibur PCI II.

---
 src/chipset/sis_85c50x.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/chipset/sis_85c50x.c b/src/chipset/sis_85c50x.c
index 56d3a0a30..ebd166d60 100644
--- a/src/chipset/sis_85c50x.c
+++ b/src/chipset/sis_85c50x.c
@@ -29,6 +29,7 @@
 #include <86box/timer.h>
 
 #include <86box/apm.h>
+#include <86box/machine.h>
 #include <86box/mem.h>
 #include <86box/smram.h>
 #include <86box/pci.h>
@@ -416,6 +417,11 @@ sis_85c50x_init(const device_t *info)
 
     sis_85c50x_reset(dev);
 
+    if (machine_has_bus(machine, MACHINE_BUS_PS2)) {
+        pic_kbd_latch(0x01);
+        pic_mouse_latch(0x01);
+    }
+
     return dev;
 }