Applied the recent mainline PCem commits (and fixed the Pentium machines);

Ported the Roland MT-32 emulation (using MUNT) from bit's MT32 emulation branch of PCem;
Sanitized the OpenAL give buffer code in openal.c a bit;
NVR path is now specifiable in the Settings dialog;
Added Logitech 3-button serial mouse per protocol description by waltje;
The RTL8029AS and the BT-958D now actually use the PCI IRQ routing;
Fixed BT-958D PCI device initialization on the bus;
PCI IRQ routing now respects the edge/level setting set on ports 4D0/4D1.

src/SOUND/midi_system.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include "../device.h"
+#include "../WIN/plat_midi.h"
+#include "midi_system.h"
+#include "midi.h"
+
+void* system_midi_init()
+{
+        midi_device_t* dev = malloc(sizeof(midi_device_t));
+        memset(dev, 0, sizeof(midi_device_t));
+
+        dev->play_msg = plat_midi_play_msg;
+        dev->play_sysex = plat_midi_play_sysex;
+        dev->write = plat_midi_write;
+
+        plat_midi_init();
+
+        midi_init(dev);
+
+        return dev;
+}
+
+void system_midi_close(void* p)
+{
+        plat_midi_close();
+
+        midi_close();
+}
+
+int system_midi_available()
+{
+        return plat_midi_get_num_devs();
+}
+
+static device_config_t system_midi_config[] =
+{
+        {
+                .name = "midi",
+                .description = "MIDI out device",
+                .type = CONFIG_MIDI,
+                .default_int = 0
+        },
+        {
+                .type = -1
+        }
+};
+
+device_t system_midi_device =
+{
+        SYSTEM_MIDI_NAME,
+        0,
+        system_midi_init,
+        system_midi_close,
+        system_midi_available,
+        NULL,
+        NULL,
+        NULL,
+        system_midi_config
+};