diff --git a/configure.ac b/configure.ac
index 7bad3c9..7afb2c2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,11 +2,14 @@ AC_INIT([65oo2], [1.0])
 
 AM_INIT_AUTOMAKE([foreign subdir-objects])
 
+AC_CANONICAL_HOST
+
 AC_LANG(C)
 AC_PROG_CC
 AC_PROG_CPP
 AC_PROG_INSTALL
 AC_PROG_RANLIB
+AM_PROG_AS
 AM_PROG_AR
 AM_PROG_CC_C_O
 
@@ -18,4 +21,4 @@ AC_CONFIG_FILES([
         lib/Makefile
         disas/Makefile
         vm/Makefile])
-AC_OUTPUT
\ No newline at end of file
+AC_OUTPUT
diff --git a/disas/main.c b/disas/main.c
index e161e1c..ebac269 100644
--- a/disas/main.c
+++ b/disas/main.c
@@ -104,16 +104,21 @@ decode_imm(uint8_t opcode)
 
   fprintf(output, "%s.", opcode_str[opcode]);
 
+  if (attr & 0x4)
+    {
+      fprintf(output, "U");
+    }
+
   switch (attr & 0x3)
     {
     case 0x0:
-      fprintf(output, "B #%X\n", readu8());
+      fprintf(output, "B #$%X\n", readu8());
       break;
     case 0x1:
-      fprintf(output, "W #%hX\n", readu16());
+      fprintf(output, "W #$%hX\n", readu16());
       break;
     case 0x2:
-      fprintf(output, "D #%X\n", readu32());
+      fprintf(output, "D #$%X\n", readu32());
       break;
     default:
       break;
@@ -146,6 +151,7 @@ decode(void)
 
   do {
     opcode = readu8();
+    if (feof(input)) return;
     switch (opcode_addr[opcode] & OP_ADDR_MODE)
       {
       case OP_ADDR_IMPL:
diff --git a/lib/op.h b/lib/op.h
index 16b551c..48f52b3 100644
--- a/lib/op.h
+++ b/lib/op.h
@@ -13,6 +13,32 @@
 # define OP_ADDR_X    1 << 4
 # define OP_ADDR_Y    1 << 5
 
+# define OP_BRK_impl  0x00
+# define OP_ORA_x_ind 0x01
+# define OP_PHP_impl  0x08
+# define OP_ORA_imm   0x09
+# define OP_ORA_abs   0x0D
+# define OP_ASL_abs   0x0E
+
+# define OP_BPL_rel   0x10
+# define OP_ORA_ind_y 0x11
+# define OP_CLC_impl  0x18
+# define OP_ORA_abs_y 0x19
+# define OP_ORA_abs_x 0x1D
+# define OP_ASL_abs_x 0x1E
+
+# define OP_JSR_abs   0x20
+# define OP_AND_x_ind 0x21
+# define OP_PLP_impl  0x28
+# define OP_AND_imm   0x29
+# define OP_ROL_a     0x2A
+# define OP_BIT_abs   0x2C
+# define OP_AND_abs   0x2D
+# define OP_ROL_abs   0x2E
+
+# define OP_BMI_rel   0x30
+# define OP_AND_ind_y 0x31
+
 extern const uint8_t opcode_addr[];
 extern const char *opcode_str[];
 
diff --git a/lib/register.h b/lib/register.h
new file mode 100644
index 0000000..7d536a0
--- /dev/null
+++ b/lib/register.h
@@ -0,0 +1,15 @@
+#ifndef REGISTER_H
+# define REGISTER_H
+
+enum
+  {
+    REG_PC,
+    REG_AC,
+    REG_X,
+    REG_Y,
+    REG_SR,
+    REG_SP,
+    REG_MAX
+  };
+
+#endif /* !REGISTER_H */
diff --git a/vm/Makefile.am b/vm/Makefile.am
index e69de29..4568631 100644
--- a/vm/Makefile.am
+++ b/vm/Makefile.am
@@ -0,0 +1,5 @@
+bin_PROGRAMS = vm
+
+vm_SOURCES = main.c jit.c x64/x64.S
+vm_CFLAGS =-I$(top_srcdir)
+vm_LDADD = ../lib/lib65oo2.a
diff --git a/vm/jit.c b/vm/jit.c
new file mode 100644
index 0000000..3c69bc3
--- /dev/null
+++ b/vm/jit.c
@@ -0,0 +1,82 @@
+#include <stdint.h>
+#include <string.h>
+#ifdef _WIN32
+# include <memoryapi.h>
+# include <sysinfoapi.h>
+#else
+# include <sys/mman.h>
+# include <unistd.h>
+#endif
+
+#include "jit.h"
+
+static size_t page_size = 0;
+
+
+JitBuffer *
+jit_buffer_new(void)
+{
+#ifdef _WIN32
+  DWORD type;
+  DWORD prot;
+  SYSTEM_INFO sysinfo;
+
+  if (page_size == 0)
+    {
+      GetSystemInfo(&sysinfo);
+      page_size = sysinfo.dwPageSize;
+    }
+
+  type = MEM_RESERVE | MEM_COMMIT;
+  prot = PAGE_READWRITE;
+
+  return (VirtualAlloc(NULL, page_size, type, prot));
+#else
+  int prot;
+  int flags;
+
+  if (page_size == 0)
+    {
+      page_size = sysconf(_SC_PAGESIZE);
+    }
+
+  prot = PROT_READ | PROT_WRITE;
+  flags = MAP_ANONYMOUS | MAP_PRIVATE;
+
+  return (mmap(NULL, page_size, prot, flags, -1, 0));
+#endif
+}
+
+void
+jit_buffer_finalize(JitBuffer *buff)
+{
+#ifdef _WIN32
+  DWORD old;
+
+  VirtualProtect(buff, page_size, PAGE_EXECUTE_READ, &old);
+#else
+  mprotect(buff, page_size, PROT_READ | PROT_EXEC);
+#endif
+}
+
+void
+jit_buffer_add(JitBuffer *buff, int size, void *value)
+{
+  memcpy(buff->code + buff->count, value, size);
+  buff->count += size;
+}
+
+void
+jit_buffer_execute(JitBuffer *buff)
+{
+}
+
+void
+jit_buffer_destroy(JitBuffer *buff)
+{
+#ifdef _WIN32
+  VirtualFree(buff, page_size, MEM_RELEASE);
+#else
+  munmap(buff, page_size);
+#endif
+}
diff --git a/vm/jit.h b/vm/jit.h
new file mode 100644
index 0000000..923c989
--- /dev/null
+++ b/vm/jit.h
@@ -0,0 +1,19 @@
+#ifndef JIT_H
+# define JIT_H
+
+# include "lib/register.h"
+
+typedef struct
+{
+  uint32_t registers[REG_MAX];
+  size_t count;
+  uint8_t code[];
+} JitBuffer;
+
+JitBuffer *jit_buffer_new(void);
+void jit_buffer_ins(JitBuffer *buff, int size, uint64_t ins);
+void jit_buffer_imm(JitBuffer *buff, int size, void *value);
+void jit_buffer_finalize(JitBuffer *buff);
+void jit_buffer_destroy(JitBuffer *buff);
+
+#endif /* !JIT_H */
diff --git a/vm/main.c b/vm/main.c
new file mode 100644
index 0000000..abcb908
--- /dev/null
+++ b/vm/main.c
@@ -0,0 +1,8 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+int
+main(int argc, char **argv)
+{
+  return (EXIT_SUCCESS);
+}
diff --git a/vm/x64/register.h b/vm/x64/register.h
new file mode 100644
index 0000000..6b8b3cc
--- /dev/null
+++ b/vm/x64/register.h
@@ -0,0 +1,8 @@
+#ifndef X64_REGISTER_H
+# define X64_REGISTER_H
+
+# define REG_ACC %eax
+# define REG_X   %ebx
+# define REG_Y   %ecx
+
+#endif /* X64_REGISTER_H */
diff --git a/vm/x64/x64.S b/vm/x64/x64.S
new file mode 100644
index 0000000..33e9529
--- /dev/null
+++ b/vm/x64/x64.S
@@ -0,0 +1,14 @@
+	#include "register.h"
+
+	.globl asm_NOP
+	.globl asm_NOP_end
+asm_NOP:
+	nop
+asm_NOP_end:
+
+	.globl asm_DEY
+	.globl asm_DEY_end
+asm_DEY:
+	dec REG_Y
+asm_DEY_end:
+