Added the Mylex MVI486

A 486 Industrial board using the Mylex BIOS

src/machine/m_at_386dx_486.c

@@ -474,7 +474,6 @@ machine_at_opti495_mr_init(const machine_t *model)
     return ret;
 }
 
-
 int
 machine_at_403tg_init(const machine_t *model)
 {
@@ -519,6 +518,27 @@ machine_at_pc330_6571_init(const machine_t *model)	// doesn't like every CPU oth
     return ret;
 }
 
+int
+machine_at_mvi486_init(const machine_t *model)
+{
+    int ret;
+
+    ret = bios_load_linear(L"roms/machines/mvi486/MVI627.BIN",
+			   0x000f0000, 65536, 0);
+
+    if (bios_only || !ret)
+	return ret;
+
+    machine_at_common_init(model);
+
+    device_add(&opti895_device);
+
+    device_add(&keyboard_at_device);
+    device_add(&pc87311_ide_device);
+
+    return ret;
+}
+
 static void
 machine_at_sis_85c471_common_init(const machine_t *model)
 {