ABSTRACT. The executable subset of VDM allows code generators to automatically produce program code. A lot of research have been conducted on automated code generators. Virtual machines are common platforms of executing program code. Those virtual machines demand rigorous implementation and in return give portability among different operating systems and CPUs. This paper introduces a virtual machine called ViennaVM which is formally defined in VDM-SL and still under development. The objective of ViennaVM is to serve as a target platform of code generators from VDM specifications.