diff --git a/src/chipset/scat.c b/src/chipset/scat.c
index 79f18d396..24b701c75 100644
--- a/src/chipset/scat.c
+++ b/src/chipset/scat.c
@@ -1364,13 +1364,24 @@ static void
 mem_write_scatw(uint32_t addr, uint16_t val, void *priv)
 {
     ems_page_t *page = (ems_page_t *)priv;
-    scat_t *dev = (scat_t *)page->scat;
+    scat_t *dev;
     uint32_t oldaddr = addr, chkaddr;
 
-    addr = get_addr(dev, addr, page);
-    chkaddr = page ? addr : oldaddr;
+    if (page == NULL)
+	dev = NULL;
+    else
+	dev = (scat_t *)page->scat;
+
+    if (dev == NULL)
+	chkaddr = oldaddr;
+    else {
+	addr = get_addr(dev, addr, page);
+	chkaddr = addr;
+    }
+
     if (chkaddr >= 0xc0000 && chkaddr < 0x100000) {
-	if (dev->regs[SCAT_RAM_WRITE_PROTECT] & (1 << ((chkaddr - 0xc0000) >> 15))) return;
+	if (dev->regs[SCAT_RAM_WRITE_PROTECT] & (1 << ((chkaddr - 0xc0000) >> 15)))
+		return;
     }
 
     if (addr < ((uint32_t)mem_size << 10))
@@ -1382,14 +1393,26 @@ static void
 mem_write_scatl(uint32_t addr, uint32_t val, void *priv)
 {
     ems_page_t *page = (ems_page_t *)priv;
-    scat_t *dev = (scat_t *)page->scat;
+    scat_t *dev;
     uint32_t oldaddr = addr, chkaddr;
 
-    addr = get_addr(dev, addr, page);
-    chkaddr = page ? addr : oldaddr;
-    if (chkaddr >= 0xc0000 && chkaddr < 0x100000) {
-	if (dev->regs[SCAT_RAM_WRITE_PROTECT] & (1 << ((chkaddr - 0xc0000) >> 15))) return;
+    if (page == NULL)
+	dev = NULL;
+    else
+	dev = (scat_t *)page->scat;
+
+    if (dev == NULL)
+	chkaddr = oldaddr;
+    else {
+	addr = get_addr(dev, addr, page);
+	chkaddr = addr;
     }
+
+    if (chkaddr >= 0xc0000 && chkaddr < 0x100000) {
+	if (dev->regs[SCAT_RAM_WRITE_PROTECT] & (1 << ((chkaddr - 0xc0000) >> 15)))
+		return;
+    }
+
     if (addr < ((uint32_t)mem_size << 10))
 	*(uint32_t *)&ram[addr] = val;
 }
diff --git a/src/config.c b/src/config.c
index 2a333f952..98b0774ef 100644
--- a/src/config.c
+++ b/src/config.c
@@ -667,7 +667,10 @@ load_sound(void)
     
     memset(temp, '\0', sizeof(temp));
     p = config_get_string(cat, "sound_type", "float");
-    strcpy(temp, p);
+    if (strlen(p) <= 511)
+	strcpy(temp, p);
+    else
+	strncpy(temp, p, 511);
     if (!strcmp(temp, "float") || !strcmp(temp, "1"))
 	sound_is_float = 1;
       else
@@ -2109,7 +2112,7 @@ config_set_int(char *head, char *name, int val)
 	ent = create_entry(section, name);
 
     sprintf(ent->data, "%i", val);
-    mbstowcs(ent->wdata, ent->data, sizeof_w(ent->wdata));
+    mbstowcs(ent->wdata, ent->data, 512);
 }
 
 
diff --git a/src/cpu/808x.c b/src/cpu/808x.c
index bf028eeaa..fb077d046 100644
--- a/src/cpu/808x.c
+++ b/src/cpu/808x.c
@@ -1215,7 +1215,7 @@ jcc(uint8_t opcode, int cond)
     wait(1, 0);
     cpu_data = pfq_fetchb();
     wait(1, 0);
-    if ((!cond) == (opcode & 0x01))
+    if ((!cond) == !!(opcode & 0x01))
 	jump_short();
 }
 
diff --git a/src/cpu_new/808x.c b/src/cpu_new/808x.c
index 266c48c63..060f3f1a3 100644
--- a/src/cpu_new/808x.c
+++ b/src/cpu_new/808x.c
@@ -1208,7 +1208,7 @@ jcc(uint8_t opcode, int cond)
     wait(1, 0);
     cpu_data = pfq_fetchb();
     wait(1, 0);
-    if ((!cond) == (opcode & 0x01))
+    if ((!cond) == !!(opcode & 0x01))
 	jump_short();
 }
 
diff --git a/src/disk/zip.c b/src/disk/zip.c
index 9185aafae..d265fbc8b 100644
--- a/src/disk/zip.c
+++ b/src/disk/zip.c
@@ -2130,8 +2130,10 @@ zip_phase_data_out(scsi_common_t *sc)
 				dev->buffer[6] = (s >> 8) & 0xff;
 				dev->buffer[7] = s & 0xff;
 			}
-			fseek(dev->drv->f, dev->drv->base + (i << 9), SEEK_SET);
-			fwrite(dev->buffer, 1, 512, dev->drv->f);
+			if (fseek(dev->drv->f, dev->drv->base + (i << 9), SEEK_SET) == -1)
+				fatal("zip_phase_data_out(): Error seeking\n");
+			if (fwrite(dev->buffer, 1, 512, dev->drv->f) != 512)
+				fatal("zip_phase_data_out(): Error writing data\n");
 		}
 		break;
 	case GPCMD_MODE_SELECT_6:
diff --git a/src/floppy/fdd_86f.c b/src/floppy/fdd_86f.c
index 02341193a..860c424c2 100644
--- a/src/floppy/fdd_86f.c
+++ b/src/floppy/fdd_86f.c
@@ -3175,10 +3175,10 @@ d86f_writeback(int drive)
 		fatal("86F write_back(): Error reading header size\n");
 
     if (fseek(dev->f, 8, SEEK_SET) == -1)
-		fatal("86F write_back(): Error seeking\n");
+	fatal("86F write_back(): Error seeking\n");
     size = d86f_get_track_table_size(drive);
     if (fwrite(dev->track_offset, 1, size, dev->f) != size)
-		fatal("86F write_back(): Error writing data\n");
+	fatal("86F write_back(): Error writing data\n");
 
     d86f_write_tracks(drive, &dev->f, NULL);
 
diff --git a/src/floppy/fdd_fdi.c b/src/floppy/fdd_fdi.c
index fdb5af532..f9e42ed6b 100644
--- a/src/floppy/fdd_fdi.c
+++ b/src/floppy/fdd_fdi.c
@@ -329,14 +329,14 @@ fdi_load(int drive, wchar_t *fn)
 
     /* Allocate a drive block. */
     dev = (fdi_t *)malloc(sizeof(fdi_t));
-    memset(dev, 0x00, sizeof(fdi_t));
 
     if (dev == NULL) {
-	free(dev);
 	memset(floppyfns[drive], 0, sizeof(floppyfns[drive]));
 	return;
     }
 
+    memset(dev, 0x00, sizeof(fdi_t));
+
     d86f_unregister(drive);
 
     dev->f = plat_fopen(fn, L"rb");
diff --git a/src/floppy/fdd_imd.c b/src/floppy/fdd_imd.c
index 1ff63ac6d..a9c9c21fa 100644
--- a/src/floppy/fdd_imd.c
+++ b/src/floppy/fdd_imd.c
@@ -190,8 +190,8 @@ track_is_xdf(int drive, int side, int track)
 			dev->current_side_flags[side] = (dev->tracks[track][side].params[3] == 19) ?  0x08 : 0x28;
 			return((dev->tracks[track][side].params[3] == 19) ? 2 : 1);
 		}
-		return(0);
 	}
+	return(0);
     } else {
 	if (dev->tracks[track][side].params[4] != 0xFF) return(0);
 
diff --git a/src/floppy/fdd_img.c b/src/floppy/fdd_img.c
index 6d0c626dc..e1417254a 100644
--- a/src/floppy/fdd_img.c
+++ b/src/floppy/fdd_img.c
@@ -490,8 +490,10 @@ img_seek(int drive, int track)
 
     is_t0 = (track == 0) ? 1 : 0;
 
-    if (! dev->disk_at_once)
-	fseek(dev->f, dev->base + (track * dev->sectors * ssize * dev->sides), SEEK_SET);
+    if (! dev->disk_at_once) {
+	if (fseek(dev->f, dev->base + (track * dev->sectors * ssize * dev->sides), SEEK_SET) == -1)
+		fatal("img_seek(): Error seeking\n");
+    }
 
     for (side = 0; side < dev->sides; side++) {
 	if (dev->disk_at_once) {
diff --git a/src/floppy/fdd_td0.c b/src/floppy/fdd_td0.c
index dd2499bee..a230a7ae8 100644
--- a/src/floppy/fdd_td0.c
+++ b/src/floppy/fdd_td0.c
@@ -656,8 +656,10 @@ td0_initialize(int drive)
 	state_Decode(&disk_decode, dev->imagebuf, TD0_MAX_BUFSZ);
     } else {
 	td0_log("TD0: File is uncompressed\n");
-	fseek(dev->f, 12, SEEK_SET);
-	fread(dev->imagebuf, 1, file_size - 12, dev->f);
+	if (fseek(dev->f, 12, SEEK_SET) == -1)
+		fatal("td0_initialize(): Error seeking to offet 12\n");
+	if (fread(dev->imagebuf, 1, file_size - 12, dev->f) != (file_size - 12))
+		fatal("td0_initialize(): Error reading image buffer\n");
     }
 
     if (header[7] & 0x80)
diff --git a/src/network/net_pcap.c b/src/network/net_pcap.c
index 5acc9c170..771b55e8e 100644
--- a/src/network/net_pcap.c
+++ b/src/network/net_pcap.c
@@ -260,10 +260,16 @@ net_pcap_prepare(netdev_t *list)
     }
 
     for (dev=devlist; dev!=NULL; dev=dev->next) {
-	strcpy(list->device, dev->name);
-	if (dev->description)
-		strcpy(list->description, dev->description);
-	  else
+	if (strlen(dev->name) <= 127)
+		strcpy(list->device, dev->name);
+	else
+		strncpy(list->device, dev->name, 127);
+	if (dev->description) {
+		if (strlen(dev->description) <= 127)
+			strcpy(list->description, dev->description);
+		else
+			strncpy(list->description, dev->description, 127);
+	} else
 		memset(list->description, '\0', sizeof(list->description));
 	list++; i++;
     }
diff --git a/src/scsi/scsi_buslogic.c b/src/scsi/scsi_buslogic.c
index 182cd2282..28ecdb612 100644
--- a/src/scsi/scsi_buslogic.c
+++ b/src/scsi/scsi_buslogic.c
@@ -625,10 +625,6 @@ BuslogicSCSIBIOSRequestSetup(x54x_t *dev, uint8_t *CmdBuf, uint8_t *DataInBuf, u
 
 	buslogic_log("Transfer Control %02X\n", ESCSICmd->DataDirection);
 	buslogic_log("CDB Length %i\n", ESCSICmd->CDBLength);	
-	if (ESCSICmd->DataDirection > 0x03) {
-		buslogic_log("Invalid control byte: %02X\n",
-			ESCSICmd->DataDirection);
-	}
     }
 
     target_cdb_len = 12;
diff --git a/src/scsi/scsi_x54x.c b/src/scsi/scsi_x54x.c
index e395923c6..8c8a5985d 100644
--- a/src/scsi/scsi_x54x.c
+++ b/src/scsi/scsi_x54x.c
@@ -415,7 +415,7 @@ x54x_bios_command(x54x_t *x54x, uint8_t max_id, BIOSCMD *cmd, int8_t islba)
 
     x54x_log("BIOS Command = 0x%02X\n", cmd->command);
 
-    if ((cmd->id > max_id) || (cmd->lun > 7)) {
+    if (cmd->id > max_id) {
 	x54x_log("BIOS Target ID %i or LUN %i are above maximum\n",
 						cmd->id, cmd->lun);
 	ret = 0x80;
diff --git a/src/sound/snd_adlibgold.c b/src/sound/snd_adlibgold.c
index 828ea518d..d4a29412d 100644
--- a/src/sound/snd_adlibgold.c
+++ b/src/sound/snd_adlibgold.c
@@ -776,7 +776,8 @@ void *adgold_init(const device_t *info)
         f = nvr_fopen(L"adgold.bin", L"rb");
         if (f)
         {
-                fread(adgold->adgold_eeprom, 0x1a, 1, f);
+                if (fread(adgold->adgold_eeprom, 1, 0x1a, f) != 0x1a)
+			fatal("adgold_init(): Error reading data\n");
                 fclose(f);
         }
 
diff --git a/src/video/vid_ati_mach64.c b/src/video/vid_ati_mach64.c
index c6c422a9d..a27621dde 100644
--- a/src/video/vid_ati_mach64.c
+++ b/src/video/vid_ati_mach64.c
@@ -789,6 +789,7 @@ static void mach64_accel_write_fifo(mach64_t *mach64, uint32_t addr, uint8_t val
                 break;
                 case 0x2a4: case 0x2a5:
                 addr += 2;
+		/*FALLTHROUGH*/
                 case 0x2aa: case 0x2ab:                       
                 WRITE8(addr, mach64->sc_left_right, val);
                 break;
diff --git a/src/video/vid_et4000w32.c b/src/video/vid_et4000w32.c
index 167a3ad05..c941d85fd 100644
--- a/src/video/vid_et4000w32.c
+++ b/src/video/vid_et4000w32.c
@@ -1247,7 +1247,7 @@ void et4000w32p_pci_write(int func, int addr, uint8_t val, void *p)
 
                 case 0x13: 
 		et4000->linearbase &= 0x00c00000; 
-                et4000->linearbase = (et4000->pci_regs[0x13] << 24);
+                et4000->linearbase |= (et4000->pci_regs[0x13] << 24);
 		svga->crtc[0x30] &= 3;
 		svga->crtc[0x30] |= ((et4000->linearbase & 0x3f000000) >> 22);
                 et4000w32p_recalcmapping(et4000); 
diff --git a/src/video/vid_pgc.c b/src/video/vid_pgc.c
index 98fd7b87b..0dbaa9595 100644
--- a/src/video/vid_pgc.c
+++ b/src/video/vid_pgc.c
@@ -1680,7 +1680,6 @@ pgc_wake(pgc_t *dev)
 void
 pgc_sleep(pgc_t *dev)
 {
-    uint8_t *n = NULL;
     pgc_log("PGC: sleeping on %i %i %i %i 0x%02x 0x%02x\n",
 	    dev->stopped,
 	    dev->waiting_input_fifo, dev->waiting_output_fifo,
@@ -1690,7 +1689,6 @@ pgc_sleep(pgc_t *dev)
     if (dev->stopped) {
 	dev->waiting_input_fifo = 0;
 	dev->waiting_output_fifo = 0;
-	*n = 0;
 	return;
     }
 
diff --git a/src/video/video.c b/src/video/video.c
index 1cbdfdac4..e7504f4b5 100644
--- a/src/video/video.c
+++ b/src/video/video.c
@@ -920,14 +920,14 @@ loadfont(wchar_t *s, int format)
 	case 0:		/* MDA */
 		for (c=0; c<256; c++)
 			for (d=0; d<8; d++)
-				fontdatm[c][d] = fgetc(f);
+				fontdatm[c][d] = fgetc(f) & 0xff;
 		for (c=0; c<256; c++)
 			for (d=0; d<8; d++)
-				fontdatm[c][d+8] = fgetc(f);
+				fontdatm[c][d+8] = fgetc(f) & 0xff;
 		(void)fseek(f, 4096+2048, SEEK_SET);
 		for (c=0; c<256; c++)
 			for (d=0; d<8; d++)
-				fontdat[c][d] = fgetc(f);
+				fontdat[c][d] = fgetc(f) & 0xff;
 		break;
 
 	case 1:		/* PC200 */
@@ -950,19 +950,19 @@ loadfont(wchar_t *s, int format)
 	case 2:		/* CGA */
 		for (c=0; c<256; c++)
 		       	for (d=0; d<8; d++)
-				fontdat[c][d] = fgetc(f);
+				fontdat[c][d] = fgetc(f) & 0xff;
 		break;
 
 	case 3:		/* Wyse 700 */
 		for (c=0; c<512; c++)
 			for (d=0; d<32; d++)
-				fontdatw[c][d] = fgetc(f);
+				fontdatw[c][d] = fgetc(f) & 0xff;
 		break;
 
 	case 4:		/* MDSI Genius */
 		for (c=0; c<256; c++)
 			for (d=0; d<16; d++)
-				fontdat8x12[c][d] = fgetc(f);
+				fontdat8x12[c][d] = fgetc(f) & 0xff;
 		break;
 
 	case 5: /* Toshiba 3100e */
@@ -1006,7 +1006,7 @@ loadfont(wchar_t *s, int format)
 		for (c = 0; c < 16384; c++)
 		{
 			for (d = 0; d < 32; d++)
-				fontdatksc5601[c].chr[d]=getc(f);
+				fontdatksc5601[c].chr[d]=fgetc(f) & 0xff;
 		}
 		break;
 
@@ -1026,7 +1026,7 @@ loadfont(wchar_t *s, int format)
 	case 8:	/* Amstrad PC1512, Toshiba T1000/T1200 */
 		for (c = 0; c < 2048; c++)	/* Allow up to 2048 chars */
 		       	for (d=0; d<8; d++)
-				fontdat[c][d] = fgetc(f);
+				fontdat[c][d] = fgetc(f) & 0xff;
 		break;
 
 	case 9:	/* Image Manager 1024 native font */
diff --git a/src/win/win_ui.c b/src/win/win_ui.c
index f15dd1069..a189fa87b 100644
--- a/src/win/win_ui.c
+++ b/src/win/win_ui.c
@@ -1077,9 +1077,12 @@ wchar_t *
 ui_window_title(wchar_t *s)
 {
     if (! video_fullscreen) {
-	if (s != NULL)
-		wcscpy(wTitle, s);
-	  else
+	if (s != NULL) {
+		if (wcslen(s) <= 512)
+			wcscpy(wTitle, s);
+		else
+			wcsncpy(wTitle, s, 512);
+	} else
 		s = wTitle;
 
        	SetWindowText(hwndMain, s);
@@ -1097,7 +1100,7 @@ void
 plat_pause(int p)
 {
     static wchar_t oldtitle[512];
-    wchar_t title[512];
+    wchar_t title[512], *t;
 
     /* If un-pausing, as the renderer if that's OK. */
     if (p == 0)
@@ -1113,7 +1116,11 @@ plat_pause(int p)
     }
 
     if (p) {
-	wcscpy(oldtitle, ui_window_title(NULL));
+	t = ui_window_title(NULL);
+	if (wcslen(t) <= 511)
+		wcscpy(oldtitle, ui_window_title(NULL));
+	else
+		wcsncpy(oldtitle, ui_window_title(NULL), 511);
 	wcscpy(title, oldtitle);
 	wcscat(title, L" - PAUSED -");
 	ui_window_title(title);