Archive for the 'Team OS/4' Category

Team OS/4: OS/4 kernel support for AMD Ryzen CPU

The OS/4 Kernel Team recently updated the OS/4 kernel to support the AMD Ryzen CPU, which has the famous VME bug found by Michal from the os2museum. AMD fixed the issue with a microcode update found in the AGESA BIOS blob.


  • updated oemhlp kernel driver which contains a patch for the AMD Ryzen VME bug
  • kernel support for the AVX CPU instructions found in recent AMD and Intel CPUs
  • new pmdd.sys/pmddk.sys which talks to the new KEE interface but it is also compatible with the IBM Aurora CP SMP Kernel