Thanks for all the help. I think because I simply booted with a 2.1 WB disk that there was no library installed so the A3640 features were not activated when I then ran sysinfo. On my A4000D, I have WB 3.1 fully installed and I am sure the library was loaded then. So this may have been why I noticed the FPU and MMU were not enabled on the single-boot disk A3000D. I will work this out soon. Thanks again!