diff --git a/src/Makefile.mingw b/src/Makefile.mingw
index 24fb51f8b..02c65792b 100644
--- a/src/Makefile.mingw
+++ b/src/Makefile.mingw
@@ -8,7 +8,7 @@
 #
 #		Modified Makefile for Win32 MinGW 32-bit environment.
 #
-# Version:	@(#)Makefile.mingw	1.0.22	2017/06/01
+# Version:	@(#)Makefile.mingw	1.0.23	2017/06/03
 #
 # Authors:	Miran Grca, <mgrca8@gmail.com>
 #               Fred N. van Kempen, <decwiz@yahoo.com>
@@ -48,6 +48,9 @@ endif
 ifndef RELEASE
 RELEASE	= n
 endif
+ifndef USB
+USB	= n
+endif
 
 
 #########################################################################
@@ -154,7 +157,9 @@ DEVOBJ	= bugger.o lpt.o serial.o \
 	    disc_random.o disc_td0.o \
 	  cdrom.o \
 	    cdrom_dosbox.o cdrom_image.o cdrom_ioctl.o cdrom_null.o
+ifeq ($(USB), y)
 USBOBJ	= usb.o
+endif
 NETOBJ	= network.o \
 	  net_pcap.o net_slirp.o \
 	  net_ne2000.o
@@ -170,7 +175,7 @@ SNDOBJ	= sound.o \
 	  snd_adlib.o snd_adlibgold.o snd_ad1848.o \
 	  snd_sb.o snd_sb_dsp.o snd_cms.o snd_dbopl.o \
 	  snd_emu8k.o snd_gus.o snd_opl.o \
-	  snd_mpu401.o snd_pas16.o snd_resid.o \
+	  snd_mpu401.o snd_resid.o \
 	  snd_sn76489.o snd_ssi2001.o snd_wss.o \
 	  snd_ym7128.o
 VIDOBJ	= video.o \
diff --git a/src/SOUND/snd_sb_dsp.c b/src/SOUND/snd_sb_dsp.c
index ba4e556f0..3d7c95cf8 100644
--- a/src/SOUND/snd_sb_dsp.c
+++ b/src/SOUND/snd_sb_dsp.c
@@ -6,6 +6,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include "../ibm.h"
+#include "../device.h"
 #include "../io.h"
 #include "../pic.h"
 #include "../dma.h"
@@ -515,7 +516,7 @@ void sb_exec_command(sb_dsp_t *dsp)
                 sb_add_data(dsp, dsp->sb_asp_regs[dsp->sb_data[0]]);
                 break;
                 case 0xF8:
-                if (dsp->sb_type < SB16) break;
+                if (dsp->sb_type >= SB16) break;
                 sb_add_data(dsp, 0);
                 break;
                 case 0xF9:
diff --git a/src/SOUND/sound.c b/src/SOUND/sound.c
index fb0237ac9..5a96ff15c 100644
--- a/src/SOUND/sound.c
+++ b/src/SOUND/sound.c
@@ -28,7 +28,7 @@
 #include "snd_opl.h"
 #include "snd_adlib.h"
 #include "snd_adlibgold.h"
-#include "snd_pas16.h"
+/* #include "snd_pas16.h" */
 #include "snd_sb.h"
 #include "snd_sb_dsp.h"
 #include "snd_wss.h"
@@ -62,7 +62,9 @@ static SOUND_CARD sound_cards[] =
         {"Sound Blaster AWE32",   "sbawe32",	&sb_awe32_device},
         {"Adlib Gold",            "adlibgold",	&adgold_device},
         {"Windows Sound System",  "wss",	&wss_device},        
+#if 0
         {"Pro Audio Spectrum 16", "pas16",	&pas16_device},
+#endif
         {"", "", NULL}
 };
 
diff --git a/src/WIN/86Box.rc b/src/WIN/86Box.rc
index 0d8b6d8d2..1020c2767 100644
--- a/src/WIN/86Box.rc
+++ b/src/WIN/86Box.rc
@@ -440,13 +440,15 @@ BEGIN
                     LVS_REPORT | LVS_SHOWSELALWAYS | LVS_SINGLESEL | WS_BORDER | 
                     WS_TABSTOP,7,18,253,60
     LTEXT           "Floppy drives:",-1,7,7,43,8
+    COMBOBOX        IDC_COMBO_FD_TYPE,33,85,90,12,CBS_DROPDOWNLIST | 
+                    WS_VSCROLL | WS_TABSTOP
+    LTEXT           "Type:",1803,7,86,24,8
+    CONTROL         "Turbo timings (no accuracy)",IDC_CHECKTURBO,"Button",
+                    BS_AUTOCHECKBOX | WS_TABSTOP,131,86,129,10
     CONTROL         "List1",IDC_LIST_CDROM_DRIVES,"SysListView32",LVS_REPORT | 
                     LVS_SHOWSELALWAYS | LVS_SINGLESEL | WS_BORDER | 
                     WS_TABSTOP,7,116,253,60
     LTEXT           "CD-ROM drives:",-1,7,106,50,8
-    COMBOBOX        IDC_COMBO_FD_TYPE,33,85,90,12,CBS_DROPDOWNLIST | 
-                    WS_VSCROLL | WS_TABSTOP
-    LTEXT           "Type:",1803,7,86,24,8
     COMBOBOX        IDC_COMBO_CD_BUS,33,183,90,12,CBS_DROPDOWNLIST | 
                     WS_VSCROLL | WS_TABSTOP
     LTEXT           "Bus:",1798,7,184,24,8
@@ -872,9 +874,13 @@ BEGIN
     IDS_2218	"&Image..."
     IDS_2219	"PCap failed to set up because it may not be initialized"
     IDS_2220	"Image (&Write-protected)..."
-    IDS_2221	"English (United States)"
+    IDS_2221	"Turbo"
+    IDS_2222	"On"
+    IDS_2223	"Off"
+    IDS_2224	"<Placeholder string>"
+    IDS_2225	"English (United States)"
 END
-#define IDS_LANG_ENUS	IDS_2221
+#define IDS_LANG_ENUS	IDS_2225
 
 
 #ifndef _MAC
diff --git a/src/WIN/resource.h b/src/WIN/resource.h
index 73a8f97c4..52edb590a 100644
--- a/src/WIN/resource.h
+++ b/src/WIN/resource.h
@@ -66,6 +66,7 @@
 #define IDC_BUTTON_HDD_ADD              1028
 #define IDC_BUTTON_CDROM_REMOVE         1029
 #define IDC_BUTTON_HDD_REMOVE           1029
+#define IDC_CHECKTURBO                  1030
 #define IDC_HDIMAGE_NEW                 1035
 #define IDC_HD_BUS                      1036
 #define IDC_HDIMAGE_EXISTING            1037
@@ -285,8 +286,12 @@
 #define IDS_2219	2219
 #define IDS_2220	2220
 #define IDS_2221	2221
+#define IDS_2222	2222
+#define IDS_2223	2223
+#define IDS_2224	2224
+#define IDS_2225	2225
 
-#define IDS_LANG_ENUS	IDS_2221
+#define IDS_LANG_ENUS	IDS_2225
 
 
 #define IDM_ABOUT          40001
@@ -473,4 +478,4 @@
 #  endif
 #endif
 
-#define STRINGS_NUM 174
+#define STRINGS_NUM 178
diff --git a/src/WIN/win_settings.c b/src/WIN/win_settings.c
index 7c187fe89..b09e801fa 100644
--- a/src/WIN/win_settings.c
+++ b/src/WIN/win_settings.c
@@ -74,6 +74,7 @@ static hard_disk_t temp_hdc[HDC_NUM];
 
 /* Removable devices category */
 static int temp_fdd_types[FDD_NUM];
+static int temp_fdd_turbo[FDD_NUM];
 static cdrom_drive_t temp_cdrom_drives[CDROM_NUM];
 
 static HWND hwndParentDialog, hwndChildDialog;
@@ -149,6 +150,7 @@ static void win_settings_init(void)
 	for (i = 0; i < FDD_NUM; i++)
 	{
 		temp_fdd_types[i] = fdd_get_type(i);
+		temp_fdd_turbo[i] = fdd_get_turbo(i);
 	}
 	memcpy(temp_cdrom_drives, cdrom_drives, CDROM_NUM * sizeof(cdrom_drive_t));
 }
@@ -212,6 +214,7 @@ static int win_settings_changed(void)
 	for (j = 0; j < FDD_NUM; j++)
 	{
 		i = i || (temp_fdd_types[j] != fdd_get_type(j));
+		i = i || (temp_fdd_turbo[j] != fdd_get_turbo(j));
 	}
 	i = i || memcmp(cdrom_drives, temp_cdrom_drives, CDROM_NUM * sizeof(cdrom_drive_t));
 
@@ -309,6 +312,7 @@ static void win_settings_save(void)
 	for (i = 0; i < FDD_NUM; i++)
 	{
 		fdd_set_type(i, temp_fdd_types[i]);
+		fdd_set_turbo(i, temp_fdd_turbo[i]);
 	}
 	memcpy(cdrom_drives, temp_cdrom_drives, CDROM_NUM * sizeof(cdrom_drive_t));
 
@@ -3454,6 +3458,16 @@ static BOOL win_settings_floppy_drives_recalc_list(HWND hwndList)
 
 		if (ListView_InsertItem(hwndList, &lvI) == -1)
 			return FALSE;
+
+		lvI.iSubItem = 1;
+		lvI.pszText = win_language_get_string_from_id(temp_fdd_turbo[i] ? 2222 : 2223);
+		lvI.iItem = i;
+		lvI.iImage = 0;
+
+		if (ListView_SetItem(hwndList, &lvI) == -1)
+		{
+			return FALSE;
+		}
 	}
 
 	return TRUE;
@@ -3515,7 +3529,7 @@ static BOOL win_settings_floppy_drives_init_columns(HWND hwndList)
 	lvc.iSubItem = 0;
 	lvc.pszText = win_language_get_string_from_id(2188);
 
-	lvc.cx = 392;
+	lvc.cx = 292;
 	lvc.fmt = LVCFMT_LEFT;
 
 	if (ListView_InsertColumn(hwndList, 0, &lvc) == -1)
@@ -3523,6 +3537,17 @@ static BOOL win_settings_floppy_drives_init_columns(HWND hwndList)
 		return FALSE;
 	}
 
+	lvc.iSubItem = 1;
+	lvc.pszText = win_language_get_string_from_id(2221);
+
+	lvc.cx = 100;
+	lvc.fmt = LVCFMT_LEFT;
+
+	if (ListView_InsertColumn(hwndList, 1, &lvc) == -1)
+	{
+		return FALSE;
+	}
+
 	return TRUE;
 }
 
@@ -3612,6 +3637,16 @@ static void win_settings_floppy_drives_update_item(HWND hwndList, int i)
 	{
 		return;
 	}
+
+	lvI.iSubItem = 1;
+	lvI.pszText = win_language_get_string_from_id(temp_fdd_turbo[i] ? 2222 : 2223);
+	lvI.iItem = i;
+	lvI.iImage = 0;
+
+	if (ListView_SetItem(hwndList, &lvI) == -1)
+	{
+		return;
+	}
 }
 
 static void win_settings_cdrom_drives_update_item(HWND hwndList, int i)
@@ -3796,6 +3831,9 @@ static BOOL CALLBACK win_settings_removable_devices_proc(HWND hdlg, UINT message
 			}
 			SendMessage(h, CB_SETCURSEL, temp_fdd_types[fdlv_current_sel], 0);
 
+			h = GetDlgItem(hdlg, IDC_CHECKTURBO);
+			SendMessage(h, BM_SETCHECK, temp_fdd_turbo[fdlv_current_sel], 0);
+
 			cdlv_current_sel = 0;
 			h = GetDlgItem(hdlg, IDC_LIST_CDROM_DRIVES);
 			win_settings_cdrom_drives_init_columns(h);
@@ -3855,6 +3893,8 @@ static BOOL CALLBACK win_settings_removable_devices_proc(HWND hdlg, UINT message
 				rd_ignore_change = 1;
 				h = GetDlgItem(hdlg, IDC_COMBO_FD_TYPE);
 				SendMessage(h, CB_SETCURSEL, temp_fdd_types[fdlv_current_sel], 0);
+				h = GetDlgItem(hdlg, IDC_CHECKTURBO);
+				SendMessage(h, BM_SETCHECK, temp_fdd_turbo[fdlv_current_sel], 0);
 				rd_ignore_change = 0;
 			}
 			else if ((((LPNMHDR)lParam)->code == LVN_ITEMCHANGED) && (((LPNMHDR)lParam)->idFrom == IDC_LIST_CDROM_DRIVES))
@@ -3918,6 +3958,20 @@ static BOOL CALLBACK win_settings_removable_devices_proc(HWND hdlg, UINT message
 					rd_ignore_change = 0;
 					return FALSE;
 
+				case IDC_CHECKTURBO:
+					if (rd_ignore_change)
+					{
+						return FALSE;
+					}
+
+					rd_ignore_change = 1;
+					h = GetDlgItem(hdlg, IDC_CHECKTURBO);
+					temp_fdd_turbo[fdlv_current_sel] = SendMessage(h, BM_GETCHECK, 0, 0);
+					h = GetDlgItem(hdlg, IDC_LIST_FLOPPY_DRIVES);
+					win_settings_floppy_drives_update_item(h, fdlv_current_sel);
+					rd_ignore_change = 0;
+					return FALSE;
+
 				case IDC_COMBO_CD_BUS:
 					if (rd_ignore_change)
 					{
diff --git a/src/config.c b/src/config.c
index 2a7913629..0b4dbce53 100644
--- a/src/config.c
+++ b/src/config.c
@@ -1480,6 +1480,8 @@ static void loadconfig_removable_devices(void)
 		printf("Floppy: %ws\n", discfns[c]);
 		sprintf(temps, "fdd_%02i_writeprot", c + 1);
 	        ui_writeprot[c] = !!config_get_int(cat, temps, 0);
+		sprintf(temps, "fdd_%02i_turbo", c + 1);
+	        fdd_set_turbo(c, !!config_get_int(cat, temps, 0));
 
 		/* Check, whether each value is default, if yes, delete it so that only non-default values will later be saved. */
 		if (fdd_get_type(c) == ((c < 2) ? 2 : 0))
@@ -1499,6 +1501,12 @@ static void loadconfig_removable_devices(void)
 			sprintf(temps, "fdd_%02i_writeprot", c + 1);
 			config_delete_var(cat, temps);
 		}
+
+		if (fdd_get_turbo(c) == 0)
+		{
+			sprintf(temps, "fdd_%02i_turbo", c + 1);
+			config_delete_var(cat, temps);
+		}
 	}
 
 	memset(temps, 0, 512);
@@ -2352,6 +2360,16 @@ static void saveconfig_removable_devices(void)
 		{
 		        config_set_int(cat, temps, ui_writeprot[c]);
 		}
+
+		sprintf(temps, "fdd_%02i_turbo", c + 1);
+		if (fdd_get_turbo(c) == 0)
+		{
+			config_delete_var(cat, temps);
+		}
+		else
+		{
+		        config_set_int(cat, temps, fdd_get_turbo(c));
+		}
 	}
 
 	memset(temps, '\0', sizeof(temps));
diff --git a/src/disc.c b/src/disc.c
index e7af927bd..46b2517c6 100644
--- a/src/disc.c
+++ b/src/disc.c
@@ -195,6 +195,11 @@ double disc_byteperiod(int drive)
 
 	if (drives[drive].byteperiod)
 	{
+		if (fdd_get_turbo(drive))
+		{
+			return 1.0;
+		}
+
 		return drives[drive].byteperiod(drive);
 	}
 	else
@@ -213,7 +218,7 @@ double disc_real_period(int drive)
 	dusec = (double) TIMER_USEC;
 
 	/* This is a giant hack but until the timings become even more correct, this is needed to make floppies work right on that BIOS. */
-	if (romset == ROM_MRTHOR)
+	if ((romset == ROM_MRTHOR) && !fdd_get_turbo(drive))
 	{
 		return (ddbp * dusec) / 4.0;
 	}
diff --git a/src/fdd.c b/src/fdd.c
index 449bf02bd..dd6649ee2 100644
--- a/src/fdd.c
+++ b/src/fdd.c
@@ -30,6 +30,8 @@ static struct
 	int densel;
 
 	int head;
+
+	int turbo;
 } fdd[FDD_NUM];
 
 /* Flags:
@@ -312,6 +314,16 @@ int fdd_get_head(int drive)
 	return fdd[drive].head;
 }
 
+void fdd_set_turbo(int drive, int turbo)
+{
+	fdd[drive].turbo = turbo;
+}
+
+int fdd_get_turbo(int drive)
+{
+	return fdd[drive].turbo;
+}
+
 int fdd_get_densel(int drive)
 {
 	if (drive_types[fdd[drive].type].flags & FLAG_INVERT_DENSEL)
diff --git a/src/fdd.h b/src/fdd.h
index 7b34c4a1a..e8de9db96 100644
--- a/src/fdd.h
+++ b/src/fdd.h
@@ -30,6 +30,8 @@ int fdd_is_ed(int drive);
 int fdd_is_double_sided(int drive);
 void fdd_set_head(int drive, int head);
 int fdd_get_head(int drive);
+void fdd_set_turbo(int drive, int turbo);
+int fdd_get_turbo(int drive);
 
 void fdd_set_type(int drive, int type);
 int fdd_get_type(int drive);
diff --git a/src/model.c b/src/model.c
index a96b0a906..209bbb017 100644
--- a/src/model.c
+++ b/src/model.c
@@ -123,14 +123,18 @@ void    at_endeavor_init();
 
 void      at_dtk486_init();
 void        at_r418_init();
+#if 0
 void      at_586mc1_init();
+#endif
 void       at_plato_init();
 void      at_mb500n_init();
 void    at_p54tp4xe_init();
 void        at_ap53_init();
 void      at_p55t2s_init();
 void     at_acerm3a_init();
+#if 0
 void    at_acerv35n_init();
+#endif
 void     at_p55t2p4_init();
 void     at_p55tvp4_init();
 void       at_p55va_init();
@@ -204,7 +208,9 @@ MODEL models[] =
         {"Award SiS 496/497",		ROM_SIS496,		"sis496",		{ "Intel", cpus_i486,        "AMD", cpus_Am486,   "Cyrix", cpus_Cx486,  "",      NULL,     "",      NULL}, 0, MODEL_AT | MODEL_HAS_IDE | MODEL_PCI,		  1,   64,   1,      at_sis496_init, NULL},
         {"Rise Computer R418",		ROM_R418,		"r418",			{ "Intel", cpus_i486,        "AMD", cpus_Am486,   "Cyrix", cpus_Cx486,  "",      NULL,     "",      NULL}, 0, MODEL_AT | MODEL_HAS_IDE | MODEL_PCI,		  1,   64,   1,        at_r418_init, NULL},
         {"Intel Premiere/PCI",		ROM_REVENGE,		"revenge",		{ "Intel", cpus_Pentium5V,   "",    NULL,         "",      NULL,        "",      NULL,     "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,	  1,  128,   1,      at_batman_init, NULL},
+#if 0
         {"Micro Star 586MC1",		ROM_586MC1,		"586mc1",		{ "Intel", cpus_Pentium5V50, "",    NULL,          "",     NULL,        "",      NULL,     "",      NULL}, 0, MODEL_AT | MODEL_HAS_IDE | MODEL_PCI,		  1,  128,   1,      at_586mc1_init, NULL},
+#endif
         {"Intel Premiere/PCI II",	ROM_PLATO,		"plato",		{ "Intel", cpus_PentiumS5,   "IDT", cpus_WinChip, "AMD",   cpus_K5,     "",      NULL,     "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  128,   1,       at_plato_init, NULL},
         {"Intel Advanced/EV",		ROM_ENDEAVOR,		"endeavor",		{ "Intel", cpus_PentiumS5,   "IDT", cpus_WinChip, "AMD",   cpus_K5,     "",      NULL,     "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  128,   1,    at_endeavor_init, NULL},
         {"Intel Advanced/ZP",		ROM_ZAPPA,		"zappa",		{ "Intel", cpus_PentiumS5,   "IDT", cpus_WinChip, "AMD",   cpus_K5,     "",      NULL,     "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  128,   1,    at_endeavor_init, NULL},
@@ -215,7 +221,9 @@ MODEL models[] =
         {"AOpen AP53",			ROM_AP53,		"ap53",			{ "Intel", cpus_Pentium,     "IDT", cpus_WinChip, "Cyrix", cpus_6x86,   "AMD",   cpus_K56, "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  256,   1,        at_ap53_init, NULL},
         {"ASUS P/I-P55T2S",		ROM_P55T2S,		"p55t2s",		{ "Intel", cpus_Pentium,     "IDT", cpus_WinChip, "Cyrix", cpus_6x86,   "AMD",   cpus_K56, "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  256,   1,      at_p55t2s_init, NULL},
         {"Acer M3a",			ROM_ACERM3A,		"acerm3a",		{ "Intel", cpus_Pentium,     "IDT", cpus_WinChip, "Cyrix", cpus_6x86,   "AMD",   cpus_K56, "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  256,   1,     at_acerm3a_init, NULL},
+#if 0
         {"Acer V35N",			ROM_ACERV35N,		"acerv3n",		{ "Intel", cpus_Pentium,     "IDT", cpus_WinChip, "Cyrix", cpus_6x86,   "AMD",   cpus_K56, "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  256,   1,    at_acerv35n_init, NULL},
+#endif
         {"ASUS P/I-P55T2P4",		ROM_P55T2P4,		"p55r2p4",		{ "Intel", cpus_Pentium,     "IDT", cpus_WinChip, "Cyrix", cpus_6x86,   "AMD",   cpus_K56, "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  256,   1,     at_p55t2p4_init, NULL},
         {"Award 430VX PCI",		ROM_430VX,		"430vx",		{ "Intel", cpus_Pentium,     "IDT", cpus_WinChip, "Cyrix", cpus_6x86,   "AMD",   cpus_K56, "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  256,   1,      at_i430vx_init, NULL},
         {"Epox P55-VA",			ROM_P55VA,		"p55va",		{ "Intel", cpus_Pentium,     "IDT", cpus_WinChip, "Cyrix", cpus_6x86,   "AMD",   cpus_K56, "",      NULL}, 0, MODEL_AT | MODEL_PS2 | MODEL_HAS_IDE | MODEL_PCI,   1,  256,   1,       at_p55va_init, NULL},
@@ -652,6 +660,7 @@ void at_batman_init()
         i430lx_init();
 }
 
+#if 0
 void at_586mc1_init()
 {
         at_ide_init();
@@ -665,6 +674,7 @@ void at_586mc1_init()
         device_add(&intel_flash_bxt_device);
 	secondary_ide_check();
 }
+#endif
 
 void at_plato_init()
 {
@@ -772,6 +782,7 @@ void at_acerm3a_init()
         device_add(&intel_flash_bxb_device);
 }
 
+#if 0
 void at_acerv35n_init()
 {
         at_ide_init();
@@ -788,6 +799,7 @@ void at_acerv35n_init()
         acerm3a_io_init();
         device_add(&intel_flash_bxb_device);
 }
+#endif
 
 void at_p55t2p4_init()
 {