diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000..c5c6294
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,4 @@
+[flake8]
+max-line-length = 88
+extend-ignore = E203
+
diff --git a/amitools/vamos/machine/machine.py b/amitools/vamos/machine/machine.py
index 551156e..ea6137e 100644
--- a/amitools/vamos/machine/machine.py
+++ b/amitools/vamos/machine/machine.py
@@ -323,6 +323,10 @@ class Machine(object):
         self.mem.w32(0, mem0)
         self.mem.w32(4, mem4)
 
+    def set_mem(self, mem):
+        """replace the memory instance with a wrapped one, e.g. for tracing"""
+        self.mem = mem
+
     def set_cycles_per_run(self, num):
         self.cycles_per_run = num
 
diff --git a/amitools/vamos/trace/mem.py b/amitools/vamos/trace/mem.py
index 163dfda..0f17ec0 100644
--- a/amitools/vamos/trace/mem.py
+++ b/amitools/vamos/trace/mem.py
@@ -7,6 +7,43 @@ class TraceMemory:
         self.mem = mem
         self.trace_mgr = trace_mgr
 
+    def cleanup(self):
+        self.mem.cleanup()
+
+    def get_ram_size_kib(self):
+        return self.mem.get_ram_size_kib()
+
+    def get_ram_size_bytes(self):
+        return self.mem.get_ram_size_bytes()
+
+    def reserve_special_range(self, num_pages=1):
+        return self.mem.reserve_special_range(num_pages)
+
+    def set_special_range_read_func(self, page_addr, width, func):
+        return self.mem.set_special_range_read_func(page_addr, width, func)
+
+    def set_special_range_write_func(self, page_addr, width, func):
+        return self.mem.set_special_range_write_func(page_addr, width, func)
+
+    def set_special_range_read_funcs(
+        self, addr, num_pages=1, r8=None, r16=None, r32=None
+    ):
+        return self.mem.set_special_range_read_funcs(addr, num_pages, r8, r16, r32)
+
+    def set_special_range_write_funcs(
+        self, addr, num_pages=1, w8=None, w16=None, w32=None
+    ):
+        return self.mem.set_special_range_write_funcs(addr, num_pages, w8, w16, w32)
+
+    def set_trace_mode(self, on):
+        return self.mem.set_trace_mode(on)
+
+    def set_trace_func(self, func):
+        return self.mem.set_trace_func(func)
+
+    def set_invalid_func(self, func):
+        return self.mem.set_invalid_func(func)
+
     # memory access
     def r32(self, addr):
         val = self.mem.r32(addr)
diff --git a/amitools/vamos/trace/mgr.py b/amitools/vamos/trace/mgr.py
index 0334466..053c922 100644
--- a/amitools/vamos/trace/mgr.py
+++ b/amitools/vamos/trace/mgr.py
@@ -34,6 +34,8 @@ class TraceManager(object):
         self.mem_tracer = TraceMemory(mem, self)
         if not log_mem_int.isEnabledFor(logging.INFO):
             log_mem_int.setLevel(logging.INFO)
+        # replace machine mem with trace memory
+        self.machine.set_mem(self.mem_tracer)
 
     def setup_cpu_mem_trace(self):
         self.machine.set_cpu_mem_trace_hook(self.trace_cpu_mem)
@@ -126,7 +128,7 @@ class TraceManager(object):
         return sym, src
 
     def _trace_mem(self, log, mode, width, addr, value, text="", addon=""):
-        val = self.trace_val_str[width] % value
+        val = self.trace_val_str[width] % int(value)
         info, label = self._get_mem_info(addr)
         if text == "" and addon == "" and label is not None:
             text, addon = self._get_label_extra(label, mode, addr, width, value)