diff --git a/SheepShaver/src/BeOS/main_beos.cpp b/SheepShaver/src/BeOS/main_beos.cpp
index 88663447..286a1ce8 100644
--- a/SheepShaver/src/BeOS/main_beos.cpp
+++ b/SheepShaver/src/BeOS/main_beos.cpp
@@ -220,6 +220,7 @@ system_info SysInfo;	// System information
 
 static void *sig_stack = NULL;		// Stack for signal handlers
 static void *extra_stack = NULL;	// Stack for SIGSEGV inside interrupt handler
+uint32  SheepMem::page_size;		// Size of a native page
 uintptr SheepMem::zero_page = 0;	// Address of ro page filled in with zeros
 uintptr SheepMem::base;				// Address of SheepShaver data
 uintptr SheepMem::top;				// Top of SheepShaver data (stack like storage)
@@ -726,6 +727,9 @@ void SheepShaver::Quit(void)
 
 void SheepShaver::init_rom(void)
 {
+	// Size of a native page
+	page_size = B_PAGE_SIZE;
+
 	// Create area for ROM
 	void *rom_addr = (void *)ROM_BASE;
 	rom_area = create_area(ROM_AREA_NAME, &rom_addr, B_EXACT_ADDRESS, ROM_AREA_SIZE, B_NO_LOCK, B_READ_AREA | B_WRITE_AREA);
diff --git a/SheepShaver/src/Unix/main_unix.cpp b/SheepShaver/src/Unix/main_unix.cpp
index 6f7ae945..9aef379b 100644
--- a/SheepShaver/src/Unix/main_unix.cpp
+++ b/SheepShaver/src/Unix/main_unix.cpp
@@ -273,6 +273,7 @@ static sigregs sigsegv_regs;				// Register dump when crashed
 static const char *crash_reason = NULL;		// Reason of the crash (SIGSEGV, SIGBUS, SIGILL)
 #endif
 
+uint32  SheepMem::page_size;				// Size of a native page
 uintptr SheepMem::zero_page = 0;			// Address of ro page filled in with zeros
 uintptr SheepMem::base = 0x60000000;		// Address of SheepShaver data
 uintptr SheepMem::top = 0;					// Top of SheepShaver data (stack like storage)
@@ -1659,8 +1660,10 @@ static void sigsegv_handler(int sig, siginfo_t *sip, void *scp)
 #endif
 		}
 	
-		// Ignore ROM writes
-		if (transfer_type == TYPE_STORE && addr >= ROM_BASE && addr < ROM_BASE + ROM_SIZE) {
+		// Ignore ROM writes (including to the zero page, which is read-only)
+		if (transfer_type == TYPE_STORE &&
+			((addr >= ROM_BASE && addr < ROM_BASE + ROM_SIZE) ||
+			 (addr >= SheepMem::ZeroPage() && addr < SheepMem::ZeroPage() + SheepMem::PageSize()))) {
 //			D(bug("WARNING: %s write access to ROM at %08lx, pc %08lx\n", transfer_size == SIZE_BYTE ? "Byte" : transfer_size == SIZE_HALFWORD ? "Halfword" : "Word", addr, r->pc()));
 			if (addr_mode == MODE_U || addr_mode == MODE_UX)
 				r->gpr(ra) = addr;
@@ -1904,7 +1907,8 @@ rti:;
 
 bool SheepMem::Init(void)
 {
-	const int page_size = getpagesize();
+	// Size of a native page
+	page_size = getpagesize();
 
 	// Allocate SheepShaver globals
 	if (vm_acquire_fixed((char *)base, size) < 0)
@@ -1932,8 +1936,6 @@ bool SheepMem::Init(void)
 void SheepMem::Exit(void)
 {
 	if (top) {
-		const int page_size = getpagesize();
-
 		// Delete SheepShaver globals
 		vm_release((void *)base, size);
 
diff --git a/SheepShaver/src/include/thunks.h b/SheepShaver/src/include/thunks.h
index 4479261d..0495b68d 100644
--- a/SheepShaver/src/include/thunks.h
+++ b/SheepShaver/src/include/thunks.h
@@ -86,6 +86,7 @@ extern uint32 NativeRoutineDescriptor(int selector);
 class SheepMem {
 	static uint32 align(uint32 size);
 protected:
+	static uint32  page_size;
 	static uintptr zero_page;
 	static uintptr base;
 	static uintptr top;
@@ -93,6 +94,7 @@ protected:
 public:
 	static bool Init(void);
 	static void Exit(void);
+	static uint32 PageSize();
 	static uintptr ZeroPage();
 	static uintptr Reserve(uint32 size);
 	static void Release(uint32 size);
@@ -105,6 +107,11 @@ inline uint32 SheepMem::align(uint32 size)
 	return (size + 3) & -4;
 }
 
+inline uint32 SheepMem::PageSize()
+{
+  return page_size;
+}
+
 inline uintptr SheepMem::ZeroPage()
 {
   return zero_page;
diff --git a/SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp b/SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp
index 37dcfd14..400228f7 100644
--- a/SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp
+++ b/SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp
@@ -715,6 +715,10 @@ static sigsegv_return_t sigsegv_handler(sigsegv_address_t fault_address, sigsegv
 		else if (pc == ROM_BASE + 0x4a10a0 && (cpu->gpr(20) == 0xf3012002 || cpu->gpr(20) == 0xf3012000))
 			return SIGSEGV_RETURN_SKIP_INSTRUCTION;
 
+		// Ignore writes to the zero page
+		else if ((uint32)(addr - SheepMem::ZeroPage()) < (uint32)SheepMem::PageSize())
+			return SIGSEGV_RETURN_SKIP_INSTRUCTION;
+
 		// Ignore all other faults, if requested
 		if (PrefsFindBool("ignoresegv"))
 			return SIGSEGV_RETURN_SKIP_INSTRUCTION;
diff --git a/SheepShaver/src/rom_patches.cpp b/SheepShaver/src/rom_patches.cpp
index e80b54c1..470d9f42 100644
--- a/SheepShaver/src/rom_patches.cpp
+++ b/SheepShaver/src/rom_patches.cpp
@@ -2305,7 +2305,7 @@ void InstallDrivers(void)
 		WriteMacInt16(dce + dCtlFlags, SonyDriverFlags);
 	}
 
-#if DISABLE_SCSI && 0
+#if DISABLE_SCSI && HAVE_SIGSEGV_SKIP_INSTRUCTION
 	// Fake SCSIGlobals
 	WriteMacInt32(0xc0c, SheepMem::ZeroPage());
 #endif