diff --git a/MANIFEST.in b/MANIFEST.in
index b18346a9..6d38af9f 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -2,10 +2,5 @@ include MANIFEST.in
 include README.md
 include CHANGELOG.md
 include Makefile
-include machine/musashi/softfloat/softfloat-macros
-include machine/musashi/softfloat/softfloat-specialize
-include machine/musashi/*.txt
 recursive-include amitools/data *
 recursive-include amitools/fs/block/bootcode *
-recursive-include machine *.pyx *.c *.h
-recursive-include gen *.c *.h
diff --git a/Makefile b/Makefile
index 7a24acf7..9b76337a 100644
--- a/Makefile
+++ b/Makefile
@@ -75,7 +75,6 @@ clean_py:
 
 clean_ext:
 	$(PYTHON) setup.py clean
-	rm -f machine/*.so machine/emu.c
 
 # install, distrib
 install:
diff --git a/README.md b/README.md
index f30a498e..09edd298 100644
--- a/README.md
+++ b/README.md
@@ -25,33 +25,42 @@ will be very helpful.
 ### Optional Packages
 
 - [lhafile - FS Edition][2]: required to use ```.lha``` file scanner
-- [cython][3]: (version >= **3.0.0**) required to rebuild the native module
+- [machine68k][3]: required to run `vamos`
 
 [1]: https://pip.pypa.io/en/stable/installation/
 [2]: https://github.com/FrodeSolheim/python-lhafile
-[3]: https://cython.org
+[3]: https://github.com/cnvogelg/machine68k/
 
 ## Installation
 
 ### Stable/Release Version
 
+If you only need the tools without `vamos` then you can install the pure
+Python version:
+
 ```bash
 pip3 install amitools
 ```
 
+If you want to run `vamos` then you need the CPU emulator from the `machine68k`
+package and you can install this dependency with:
+
+```bash
+pip3 install 'amitools[vamos]'
+```
+
 Note:
 
 - on Linux/macOS may use ``sudo`` to install for all users
-- requires a host C compiler to compile the extension.
 - the version may be a bit outdated. If you need recent changes use the
   current version.
 
 ### Current Version from GitHub
 
-Ensure you have Cython installed:
+If you wan to run `vamos` then first install the CPU emulator `machine68k`:
 
 ```bash
-pip3 install cython
+pip3 install -U git+https://github.com/cnvogelg/machine68k.git
 ```
 
 Then install `amitools` directly from the git repository:
@@ -70,10 +79,10 @@ Note:
 
 - Follow this route if you want to hack around with the amitools codebase
 - Clone the Git repo: [amitools@git](https://github.com/cnvogelg/amitools)
-- Ensure you have Cython installed:
+- Ensure you have Cython and `machine68k` installed:
 
 ```bash
-pip3 install cython
+pip3 install cython machine68k
 ```
 
 - Enter the directory of the cloned repo and install via pip:
@@ -99,6 +108,8 @@ The new Documentation of `amitools` is hosted on [readthedocs][4]
   and dos calls with its own implementation and maps all file access to
   your local file system.
 
+  Note: `vamos` requires the package `machine68k` installed first!
+
 - [xdftool][5]
 
   Create and modify ADF or HDF disk image files.
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 6496e3c1..ef475b77 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,3 +4,4 @@ twine
 tox
 black
 build
+machine68k
diff --git a/requirements-test.txt b/requirements-test.txt
index 1fa6dff5..f3499cf8 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,2 +1,3 @@
 pytest
 pytest-benchmark
+machine68k