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/rom.c

@@ -25,6 +25,22 @@ FILE *nvrfopen(wchar_t *fn, wchar_t *mode)
 }
 
 
+int rom_getfile(wchar_t *fn, wchar_t *s, int size)
+{
+        FILE *f;
+
+        wcscpy(s, pcempath);
+	put_backslash_w(s);
+	wcscat(s, fn);
+	f = _wfopen(s, L"rb");
+	if (f)
+	{
+		fclose(f);
+		return 1;
+	}
+        return 0;
+}
+
 int rom_present(wchar_t *fn)
 {
         FILE *f;