diff --git a/src/i430fx.c b/src/i430fx.c
index a562447..678c824 100644
--- a/src/i430fx.c
+++ b/src/i430fx.c
@@ -106,6 +106,30 @@ void i430fx_write(int func, int addr, uint8_t val, void *priv)
                         i430fx_map(0xec000, 0x04000, val >> 4);
                 pclog("i430fx_write : PAM6 write %02X\n", val);
                 break;
+
+                case 0x72: /*SMRAM*/
+                pclog("Write SMRAM %02x\n", val);
+                val = (val & 0x78) | 2; /*SMRAM always at A0000-BFFFF*/
+                val |= (card_i430fx[0x72] & 0x10); /*D_LCK can not be cleared by software*/
+                if (val & 0x10) /*D_LCK locks D_OPEN and G_SMRAME*/
+                {
+                        val &= ~0x48; /*D_OPEN is forced to 0, G_SMRAME is read only*/
+                        val |= (card_i430fx[0x72] & 0x08);
+                }
+                if ((card_i430fx[0x72] ^ val) & 0x40)
+                {
+                        if (val & 0x40) /*SMRAM enabled*/
+                        {
+                                pclog("Enable SMRAM\n");
+                                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+                        }
+                        else
+                        {
+                                pclog("Disable SMRAM\n");
+                                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
+                        }
+                }
+                break;
         }
                 
         card_i430fx[addr] = val;
@@ -119,6 +143,17 @@ uint8_t i430fx_read(int func, int addr, void *priv)
         return card_i430fx[addr];
 }
 
+static void i430fx_smram_enable(void)
+{
+        if (card_i430fx[0x72] & 8)
+                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+}
+static void i430fx_smram_disable(void)
+{
+        if (card_i430fx[0x72] & 8)
+                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
+}
+
 void i430fx_init()
 {
         pci_add_specific(0, i430fx_read, i430fx_write, NULL);
@@ -141,6 +176,9 @@ void i430fx_init()
         card_i430fx[0x72] = 0x02;
 //        card_i430fx[0x74] = 0x0e;
 //        card_i430fx[0x78] = 0x23;
+
+        smram_enable = i430fx_smram_enable;
+        smram_disable = i430fx_smram_disable;
 }
 
 void i430fx_reset()
diff --git a/src/i430hx.c b/src/i430hx.c
index 0871ca9..466b002 100644
--- a/src/i430hx.c
+++ b/src/i430hx.c
@@ -106,6 +106,30 @@ void i430hx_write(int func, int addr, uint8_t val, void *priv)
                         i430hx_map(0xec000, 0x04000, val >> 4);
                 pclog("i430hx_write : PAM6 write %02X\n", val);
                 break;
+
+                case 0x72: /*SMRAM*/
+                pclog("Write SMRAM %02x\n", val);
+                val = (val & 0x78) | 2; /*SMRAM always at A0000-BFFFF*/
+                val |= (card_i430hx[0x72] & 0x10); /*D_LCK can not be cleared by software*/
+                if (val & 0x10) /*D_LCK locks D_OPEN and G_SMRAME*/
+                {
+                        val &= ~0x48; /*D_OPEN is forced to 0, G_SMRAME is read only*/
+                        val |= (card_i430hx[0x72] & 0x08);
+                }
+                if ((card_i430hx[0x72] ^ val) & 0x40)
+                {
+                        if (val & 0x40) /*SMRAM enabled*/
+                        {
+                                pclog("Enable SMRAM\n");
+                                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+                        }
+                        else
+                        {
+                                pclog("Disable SMRAM\n");
+                                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
+                        }
+                }
+                break;
         }
                 
         card_i430hx[addr] = val;
@@ -119,7 +143,17 @@ uint8_t i430hx_read(int func, int addr, void *priv)
         return card_i430hx[addr];
 }
  
-    
+static void i430hx_smram_enable(void)
+{
+        if (card_i430hx[0x72] & 8)
+                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+}
+static void i430hx_smram_disable(void)
+{
+        if (card_i430hx[0x72] & 8)
+                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
+}
+
 void i430hx_init()
 {
         pci_add_specific(0, i430hx_read, i430hx_write, NULL);
@@ -141,6 +175,9 @@ void i430hx_init()
         card_i430hx[0x64] = card_i430hx[0x5F] = 0x02; 
         card_i430hx[0x65] = card_i430hx[0x66] = card_i430hx[0x67] = 0x02;
         card_i430hx[0x68] = 0x11;
+
+        smram_enable = i430hx_smram_enable;
+        smram_disable = i430hx_smram_disable;
 }
 
 void i430hx_reset()
diff --git a/src/i430vx.c b/src/i430vx.c
index 5d97d23..fde2258 100644
--- a/src/i430vx.c
+++ b/src/i430vx.c
@@ -105,6 +105,30 @@ void i430vx_write(int func, int addr, uint8_t val, void *priv)
                         i430vx_map(0xec000, 0x04000, val >> 4);
                 pclog("i430vx_write : PAM6 write %02X\n", val);
                 break;
+
+                case 0x72: /*SMRAM*/
+                pclog("Write SMRAM %02x\n", val);
+                val = (val & 0x78) | 2; /*SMRAM always at A0000-BFFFF*/
+                val |= (card_i430vx[0x72] & 0x10); /*D_LCK can not be cleared by software*/
+                if (val & 0x10) /*D_LCK locks D_OPEN and G_SMRAME*/
+                {
+                        val &= ~0x48; /*D_OPEN is forced to 0, G_SMRAME is read only*/
+                        val |= (card_i430vx[0x72] & 0x08);
+                }
+                if ((card_i430vx[0x72] ^ val) & 0x40)
+                {
+                        if (val & 0x40) /*SMRAM enabled*/
+                        {
+                                pclog("Enable SMRAM\n");
+                                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+                        }
+                        else
+                        {
+                                pclog("Disable SMRAM\n");
+                                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
+                        }
+                }
+                break;
         }
                 
         card_i430vx[addr] = val;
@@ -118,7 +142,17 @@ uint8_t i430vx_read(int func, int addr, void *priv)
         return card_i430vx[addr];
 }
  
-    
+static void i430vx_smram_enable(void)
+{
+        if (card_i430vx[0x72] & 8)
+                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+}
+static void i430vx_smram_disable(void)
+{
+        if (card_i430vx[0x72] & 8)
+                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
+}
+
 void i430vx_init()
 {
         pci_add_specific(0, i430vx_read, i430vx_write, NULL);
@@ -141,6 +175,9 @@ void i430vx_init()
         card_i430vx[0x72] = 0x02;
         card_i430vx[0x74] = 0x0e;
         card_i430vx[0x78] = 0x23;
+
+        smram_enable = i430vx_smram_enable;
+        smram_disable = i430vx_smram_disable;
 }
 
 void i430vx_reset()
diff --git a/src/i440fx.c b/src/i440fx.c
index c95c79c..87d1dfe 100644
--- a/src/i440fx.c
+++ b/src/i440fx.c
@@ -106,6 +106,30 @@ void i440fx_write(int func, int addr, uint8_t val, void *priv)
                         i440fx_map(0xec000, 0x04000, val >> 4);
                 pclog("i440fx_write : PAM6 write %02X\n", val);
                 break;
+
+                case 0x72: /*SMRAM*/
+                pclog("Write SMRAM %02x\n", val);
+                val = (val & 0x78) | 2; /*SMRAM always at A0000-BFFFF*/
+                val |= (card_i440fx[0x72] & 0x10); /*D_LCK can not be cleared by software*/
+                if (val & 0x10) /*D_LCK locks D_OPEN and G_SMRAME*/
+                {
+                        val &= ~0x48; /*D_OPEN is forced to 0, G_SMRAME is read only*/
+                        val |= (card_i440fx[0x72] & 0x08);
+                }
+                if ((card_i440fx[0x72] ^ val) & 0x40)
+                {
+                        if (val & 0x40) /*SMRAM enabled*/
+                        {
+                                pclog("Enable SMRAM\n");
+                                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+                        }
+                        else
+                        {
+                                pclog("Disable SMRAM\n");
+                                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
+                        }
+                }
+                break;
         }
 
         card_i440fx[addr] = val;
@@ -119,6 +143,17 @@ uint8_t i440fx_read(int func, int addr, void *priv)
         return card_i440fx[addr];
 }
 
+static void i440fx_smram_enable(void)
+{
+        if (card_i440fx[0x72] & 8)
+                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+}
+static void i440fx_smram_disable(void)
+{
+        if (card_i440fx[0x72] & 8)
+                mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
+}
+
 void i440fx_init()
 {
         pci_add_specific(0, i440fx_read, i440fx_write, NULL);
@@ -137,6 +172,9 @@ void i440fx_init()
         card_i440fx[0x60] = card_i440fx[0x61] = card_i440fx[0x62] = card_i440fx[0x63] = card_i440fx[0x64] = 0x01;
         card_i440fx[0x71] = 0x10;
         card_i440fx[0x72] = 0x02;
+
+        smram_enable = i440fx_smram_enable;
+        smram_disable = i440fx_smram_disable;
 }
 
 void i440fx_reset()
diff --git a/src/intel.c b/src/intel.c
index 2010cc3..3d66644 100644
--- a/src/intel.c
+++ b/src/intel.c
@@ -127,7 +127,7 @@ uint8_t endeavor_brdconfig(uint16_t port, void *p)
                         temp = 0x10;
                 else
                         temp = 0x10; // TODO: how are the overdrive processors configured?
-                return 0xe2 | temp;
+                return 0xe0 | temp;
         }
         return 0;
 }
diff --git a/src/piix.c b/src/piix.c
index 184c748..35eebe2 100644
--- a/src/piix.c
+++ b/src/piix.c
@@ -29,6 +29,12 @@ static sff_busmaster_t piix_busmaster[2];
 static uint8_t piix_rc = 0;
 static void (*piix_nb_reset)();
 
+#define REG_SMIEN 0xa2
+#define REG_SMIREQ 0xaa
+
+#define SMIEN_APMC   (1 << 7)
+#define SMIREQ_RAPMC (1 << 7)
+
 
 void piix_write(int func, int addr, uint8_t val, void *priv)
 {
@@ -139,6 +145,21 @@ void piix_write(int func, int addr, uint8_t val, void *priv)
                         else
                                 pci_set_irq_routing(PCI_INTD, val & 0xf);
                         break;
+                        case REG_SMIREQ:
+                        if (piix.type <= TYPE_PIIX3)
+                        {
+                                card_piix[addr] &= val;
+                                return;
+                        }
+                        break;
+                        case REG_SMIREQ+1:
+                        if (piix.type <= TYPE_PIIX3)
+                        {
+                                card_piix[addr] &= val;
+                                return;
+                        }
+                        break;
+
                 }
                 card_piix[addr] = val;
         }
@@ -179,8 +200,11 @@ void piix_rc_write(uint16_t port, uint8_t val, void *p)
                         keyboard_at_reset(); /*Reset keyboard controller to reset system flag*/
                         ide_reset_devices();
                         piix.pm.timer_offset = tsc;
+                        resetx86();
+                        piix.pm.apmc = piix.pm.apms = 0;
                 }
-                resetx86();
+                else
+                        softresetx86();
         }
 
         piix_rc = val & ~4;
@@ -205,9 +229,53 @@ static void piix_92_write(uint16_t port, uint8_t val, void *p)
         piix.port_92 = val;
 }
 
-
-void piix_init(int card, int pci_a, int pci_b, int pci_c, int pci_d, void (*nb_reset)())
+static uint8_t piix_apm_read(uint16_t port, void *p)
 {
+        piix_t *piix = (piix_t *)p;
+        uint8_t ret = 0xff;
+
+        switch (port)
+        {
+                case 0xb2:
+                ret = piix->pm.apmc;
+                break;
+
+                case 0xb3:
+                ret = piix->pm.apms;
+                break;
+        }
+//        pclog("piix_apm_read: port=%04x ret=%02x\n", port, ret);
+        return ret;
+}
+
+static void piix_apm_write(uint16_t port, uint8_t val, void *p)
+{
+        piix_t *piix = (piix_t *)p;
+
+//        pclog("piix_apm_write: port=%04x val=%02x\n", port, val);
+
+        switch (port)
+        {
+                case 0xb2:
+                piix->pm.apmc = val;
+                if (card_piix[REG_SMIEN] & SMIEN_APMC)
+                {
+                        card_piix[REG_SMIREQ] |= SMIREQ_RAPMC;
+//                        pclog("APMC write causes SMI\n");
+                        x86_smi_trigger();
+                }
+                break;
+
+                case 0xb3:
+                piix->pm.apms = val;
+                break;
+        }
+}
+
+static void piix_common_init(int card, int pci_a, int pci_b, int pci_c, int pci_d, void (*nb_reset)())
+{
+        memset(&piix, 0, sizeof(piix_t));
+
         pci_add_specific(card, piix_read, piix_write, NULL);
         
         memset(card_piix, 0, 256);
@@ -263,6 +331,13 @@ void piix_init(int card, int pci_a, int pci_b, int pci_c, int pci_d, void (*nb_r
         piix.type = TYPE_PIIX3;
 }
 
+void piix_init(int card, int pci_a, int pci_b, int pci_c, int pci_d, void (*nb_reset)())
+{
+        piix_common_init(card, pci_a, pci_b, pci_c, pci_d, nb_reset);
+
+        io_sethandler(0x00b2, 0x0002, piix_apm_read, NULL, NULL, piix_apm_write, NULL, NULL, &piix);
+}
+
 void piix4_init(int card, int pci_a, int pci_b, int pci_c, int pci_d, void (*nb_reset)())
 {
         piix_init(card, pci_a, pci_b, pci_c, pci_d, nb_reset);
diff --git a/src/piix_pm.c b/src/piix_pm.c
index a3947b7..e55766f 100644
--- a/src/piix_pm.c
+++ b/src/piix_pm.c
@@ -291,7 +291,7 @@ static uint8_t piix_smbus_read(uint16_t port, void *p)
         return ret;
 }
 
-static uint8_t piix_apm_read(uint16_t port, void *p)
+static uint8_t piix4_apm_read(uint16_t port, void *p)
 {
         piix_t *piix = (piix_t *)p;
         uint8_t ret = 0xff;
@@ -309,7 +309,7 @@ static uint8_t piix_apm_read(uint16_t port, void *p)
 //        pclog("piix_apm_read: port=%04x ret=%02x\n", port, ret);
         return ret;
 }
-static void piix_apm_write(uint16_t port, uint8_t val, void *p)
+static void piix4_apm_write(uint16_t port, uint8_t val, void *p)
 {
         piix_t *piix = (piix_t *)p;
 
@@ -413,5 +413,5 @@ void piix_pm_init(piix_t *piix)
         piix->pm.timer_offset = 0;
         piix->pm.gporeg = 0x7fffbfff;
 
-        io_sethandler(0x00b2, 0x0002, piix_apm_read, NULL, NULL, piix_apm_write, NULL, NULL, piix);
+        io_sethandler(0x00b2, 0x0002, piix4_apm_read, NULL, NULL, piix4_apm_write, NULL, NULL, piix);
 }