diff --git a/BasiliskII/src/AmigaOS/Makefile b/BasiliskII/src/AmigaOS/Makefile
index e9b87225..41d00b63 100644
--- a/BasiliskII/src/AmigaOS/Makefile
+++ b/BasiliskII/src/AmigaOS/Makefile
@@ -4,7 +4,7 @@
 CC = gcc
 CXX = c++
 CXXFLAGS = -g -O1 -noixemul -m68020 -msmall-code -Wno-multichar
-CPPFLAGS = -I../include -I.
+CPPFLAGS = -I../include -I../native_cpu -I.
 DEFS =
 LDFLAGS = -noixemul
 LIBS = /gg/lib/libnix/swapstack.o
diff --git a/BasiliskII/src/AmigaOS/asm_support.asm b/BasiliskII/src/AmigaOS/asm_support.asm
index ff58c8f0..76518c9a 100644
--- a/BasiliskII/src/AmigaOS/asm_support.asm
+++ b/BasiliskII/src/AmigaOS/asm_support.asm
@@ -183,7 +183,7 @@ _ExceptionHandlerAsm
 		pea	1$
 		move.w	_EmulatedSR,d0
 		move.w	d0,-(sp)
-		or.w	#$0100,d0		;Set interrupt level in SR
+		or.w	#$2100,d0		;Set interrupt level in SR
 		move.w	d0,_EmulatedSR
 		move.l	$64.w,a0		;Jump to MacOS interrupt handler
 		jmp	(a0)
diff --git a/BasiliskII/src/AmigaOS/main_amiga.cpp b/BasiliskII/src/AmigaOS/main_amiga.cpp
index 83d51c92..87241f67 100644
--- a/BasiliskII/src/AmigaOS/main_amiga.cpp
+++ b/BasiliskII/src/AmigaOS/main_amiga.cpp
@@ -610,7 +610,7 @@ void __saveds IllInstrHandler(trap_regs *r)
 		EmulatedSR |= 0x0700;
 
 		// Call opcode routine
-		EmulOp(*(uint16 *)(r->pc), (M68kRegisters *)r);
+		EmulOp(opcode, (M68kRegisters *)r);
 		r->pc += 2;
 
 		// Restore interrupts
diff --git a/BasiliskII/src/AmigaOS/sysdeps.h b/BasiliskII/src/AmigaOS/sysdeps.h
index 04b1283a..2e2348fc 100644
--- a/BasiliskII/src/AmigaOS/sysdeps.h
+++ b/BasiliskII/src/AmigaOS/sysdeps.h
@@ -30,20 +30,20 @@
 
 #include "user_strings_amiga.h"
 
-// Are the Mac and the host address space the same?
+// Mac and host address space are the same
 #define REAL_ADDRESSING 1
 
-// Are we using a 68k emulator or the real thing?
+// Using 68k natively
 #define EMULATED_68K 0
 
-// Is the Mac ROM write protected?
+// Mac ROM is not write protected
 #define ROM_IS_WRITE_PROTECTED 0
 
 // ExtFS is supported
 #define SUPPORTS_EXTFS 1
 
 // mon is not supported
-#define ENABLE_MON 0
+#undef ENABLE_MON
 
 // Data types
 typedef unsigned char uint8;
diff --git a/BasiliskII/src/BeOS/main_beos.cpp b/BasiliskII/src/BeOS/main_beos.cpp
index 0da0bcbf..30290e5c 100644
--- a/BasiliskII/src/BeOS/main_beos.cpp
+++ b/BasiliskII/src/BeOS/main_beos.cpp
@@ -214,7 +214,7 @@ void BasiliskII::StartEmulator(void)
 	char str[256];
 
 #if REAL_ADDRESSING
-	// Open memory mess driver and remap low memory
+	// Open sheep driver and remap low memory
 	sheep_fd = open("/dev/sheep", 0);
 	if (sheep_fd < 0) {
 		sprintf(str, GetString(STR_NO_SHEEP_DRIVER_ERR), strerror(sheep_fd), sheep_fd);
diff --git a/BasiliskII/src/BeOS/sysdeps.h b/BasiliskII/src/BeOS/sysdeps.h
index c068737d..30a3c341 100644
--- a/BasiliskII/src/BeOS/sysdeps.h
+++ b/BasiliskII/src/BeOS/sysdeps.h
@@ -36,17 +36,17 @@
 #define WORDS_BIGENDIAN 1
 #endif
 
-// Are we using a 68k emulator or the real thing?
+// Using 68k emulator
 #define EMULATED_68K 1
 
-// Is the Mac ROM write protected?
+// Mac ROM is write protected
 #define ROM_IS_WRITE_PROTECTED 1
 
 // ExtFS is supported
 #define SUPPORTS_EXTFS 1
 
 // mon is not supported
-#define ENABLE_MON 0
+#undef ENABLE_MON
 
 // Time data type for Time Manager emulation
 typedef bigtime_t tm_time_t;
diff --git a/BasiliskII/src/emul_op.cpp b/BasiliskII/src/emul_op.cpp
index 084a0bf7..3ae68635 100644
--- a/BasiliskII/src/emul_op.cpp
+++ b/BasiliskII/src/emul_op.cpp
@@ -42,7 +42,7 @@
 #include "extfs.h"
 #include "emul_op.h"
 
-#if ENABLE_MON
+#ifdef ENABLE_MON
 #include "mon.h"
 #endif
 
@@ -68,7 +68,7 @@ void EmulOp(uint16 opcode, M68kRegisters *r)
 				   r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
 				   r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
 				   r->sr);
-#if ENABLE_MON
+#ifdef ENABLE_MON
 			char *arg[2] = {"rmon", NULL};
 			mon(1, arg);
 #endif
@@ -196,8 +196,8 @@ void EmulOp(uint16 opcode, M68kRegisters *r)
 			break;
 
 		case M68K_EMUL_OP_FIX_BOOTSTACK:	// Set boot stack to 3/4 of RAM (7.5)
-			D(bug("Fix boot stack\n"));
 			r->a[1] = RAMBaseMac + RAMSize * 3 / 4;
+			D(bug("Fix boot stack %08x\n", r->a[1]));
 			break;
 
 		case M68K_EMUL_OP_FIX_MEMSIZE: {	// Set correct logical and physical memory size
@@ -510,7 +510,7 @@ void EmulOp(uint16 opcode, M68kRegisters *r)
 				   r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
 				   r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
 				   r->sr);
-#if ENABLE_MON
+#ifdef ENABLE_MON
 			char *arg[2] = {"rmon", NULL};
 			mon(1, arg);
 #endif
diff --git a/BasiliskII/src/include/video.h b/BasiliskII/src/include/video.h
index 85f1b94d..5eaafd01 100644
--- a/BasiliskII/src/include/video.h
+++ b/BasiliskII/src/include/video.h
@@ -54,6 +54,7 @@ extern void VideoExit(void);
 extern void VideoQuitFullScreen(void);
 
 extern void VideoInterrupt(void);
+extern void VideoRefresh(void);
 
 extern void video_set_palette(uint8 *pal);
 
diff --git a/BasiliskII/src/native_cpu/cpu_emulation.h b/BasiliskII/src/native_cpu/cpu_emulation.h
new file mode 100644
index 00000000..2b68060e
--- /dev/null
+++ b/BasiliskII/src/native_cpu/cpu_emulation.h
@@ -0,0 +1,65 @@
+/*
+ *  cpu_emulation.h - Definitions for Basilisk II CPU emulation module (native 68k version)
+ *
+ *  Basilisk II (C) 1997-2000 Christian Bauer
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef CPU_EMULATION_H
+#define CPU_EMULATION_H
+
+
+/*
+ *  Memory system
+ */
+
+// RAM and ROM pointers (allocated and set by main_*.cpp)
+extern uint32 RAMBaseMac;		// RAM base (Mac address space), does not include Low Mem when != 0
+extern uint8 *RAMBaseHost;		// RAM base (host address space)
+extern uint32 RAMSize;			// Size of RAM
+
+extern uint32 ROMBaseMac;		// ROM base (Mac address space)
+extern uint8 *ROMBaseHost;		// ROM base (host address space)
+extern uint32 ROMSize;			// Size of ROM
+
+// Mac memory access functions
+static inline uint32 ReadMacInt32(uint32 addr) {return *(uint32 *)addr;}
+static inline uint32 ReadMacInt16(uint32 addr) {return *(uint16 *)addr;}
+static inline uint32 ReadMacInt8(uint32 addr) {return *(uint8 *)addr;}
+static inline void WriteMacInt32(uint32 addr, uint32 l) {*(uint32 *)addr = l;}
+static inline void WriteMacInt16(uint32 addr, uint32 w) {*(uint16 *)addr = w;}
+static inline void WriteMacInt8(uint32 addr, uint32 b) {*(uint8 *)addr = b;}
+static inline uint8 *Mac2HostAddr(uint32 addr) {return (uint8 *)addr;}
+static inline void *Mac_memset(uint32 addr, int c, size_t n) {return memset(Mac2HostAddr(addr), c, n);}
+static inline void *Mac2Host_memcpy(void *dest, uint32 src, size_t n) {return memcpy(dest, Mac2HostAddr(src), n);}
+static inline void *Host2Mac_memcpy(uint32 dest, const void *src, size_t n) {return memcpy(Mac2HostAddr(dest), src, n);}
+static inline void *Mac2Mac_memcpy(uint32 dest, uint32 src, size_t n) {return memcpy(Mac2HostAddr(dest), Mac2HostAddr(src), n);}
+
+
+/*
+ *  680x0 emulation
+ */
+
+// 680x0 emulation functions
+struct M68kRegisters;
+extern void Start680x0(void);									// Reset and start 680x0
+extern "C" void Execute68k(uint32 addr, M68kRegisters *r);		// Execute 68k code from EMUL_OP routine
+extern "C" void Execute68kTrap(uint16 trap, M68kRegisters *r);	// Execute MacOS 68k trap from EMUL_OP routine
+
+// Interrupt functions
+extern void TriggerInterrupt(void);								// Trigger interrupt (InterruptFlag must be set first)
+
+#endif
diff --git a/BasiliskII/src/rom_patches.cpp b/BasiliskII/src/rom_patches.cpp
index 4ab09b2f..7d913e3d 100644
--- a/BasiliskII/src/rom_patches.cpp
+++ b/BasiliskII/src/rom_patches.cpp
@@ -693,7 +693,7 @@ static const uint8 adbop_patch[] = {	// Call ADBOp() completion procedure
 
 void InstallDrivers(uint32 pb)
 {
-	D(bug("InstallDrivers\n"));
+	D(bug("InstallDrivers, pb %08x\n", pb));
 	M68kRegisters r;
 
 	// Install Microseconds() replacement routine
@@ -1215,7 +1215,7 @@ static bool patch_rom_32(void)
 #endif
 
 #if !ROM_IS_WRITE_PROTECTED
-#if defined(AMIGA)
+#if defined(AMIGA) || defined(__NetBSD__)
 	// Set fake handle at 0x0000 to scratch memory area (so broken Mac programs won't write into Mac ROM)
 	extern uint32 ScratchMem;
 	wp = (uint16 *)(ROMBaseHost + 0xccaa);
diff --git a/BasiliskII/src/rsrc_patches.cpp b/BasiliskII/src/rsrc_patches.cpp
index 61bf401b..37e34e7b 100644
--- a/BasiliskII/src/rsrc_patches.cpp
+++ b/BasiliskII/src/rsrc_patches.cpp
@@ -89,7 +89,7 @@ void CheckLoad(uint32 type, int16 id, uint8 *p, uint32 size)
 		if (base) {
 			p16 = (uint16 *)(p + base);
 
-#if defined(AMIGA)
+#if defined(AMIGA) || defined(__NetBSD__)
 			// Set 0x0000 to scratch memory area
 			extern uint32 ScratchMem;
 			*p16++ = htons(0x207c);			// move.l	#ScratchMem,a0
@@ -113,7 +113,7 @@ void CheckLoad(uint32 type, int16 id, uint8 *p, uint32 size)
 		if (base) {
 			p16 = (uint16 *)(p + base);
 
-#if defined(AMIGA)
+#if defined(AMIGA) || defined(__NetBSD__)
 			// Set 0x0000 to scratch memory area
 			extern uint32 ScratchMem;
 			*p16++ = htons(0x207c);			// move.l	#ScratchMem,a0