From 4c42cc1596a2a499aad44e3ffd0a42922fbefb39 Mon Sep 17 00:00:00 2001
From: SarahW <pcem@pcem-emulator.co.uk>
Date: Mon, 6 Nov 2017 22:10:32 +0000
Subject: [PATCH] Implement Headland fast reset. Fixes AMI 386SX clone.

---
 src/headland.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/headland.c b/src/headland.c
index b4f460f..b3bc4d0 100644
--- a/src/headland.c
+++ b/src/headland.c
@@ -2,6 +2,7 @@
 #include "io.h"
 #include "mem.h"
 #include "cpu.h"
+#include "x86.h"
 
 #include "headland.h"
 
@@ -12,6 +13,8 @@ void headland_write(uint16_t addr, uint8_t val, void *priv)
 {
         if (addr & 1)
         {
+                uint8_t old_val = headland_regs[headland_index];
+                
                 if (headland_index == 0xc1 && !is486) val = 0;
                 headland_regs[headland_index] = val;
                 pclog("Headland write %02X %02X\n",headland_index,val);
@@ -24,6 +27,11 @@ void headland_write(uint16_t addr, uint8_t val, void *priv)
                         else
                                 mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL);
                 }
+                else if (headland_index == 0x87)
+                {
+                        if ((val & 1) && !(old_val & 1))
+                                softresetx86();
+                }
         }
         else
                 headland_index = val;