

Do not enable 2D or 3D acceleration, as these will likely provide no performance improvement.† – In VirtualBox 6.1, be sure to keep the default Graphics Controller of VBoxVGA. This value may always be adjusted after the VM has been created. Select Display, and set the video memory as desired.† – In VirtualBox 6.1, VT-x/AMD-V is assumed to always be available. (See notes above about hardware virtualization being required in the host system.) Leave all other System settings at their defaults. This should be the default setting for an OS/2 machine type. On the Acceleration tab, ensure that VT-x/AMD-V is enabled (checked). On the Motherboard tab, ensure that Enable I/O APIC is selected. Once the VM has been added to the list in the VirtualBox GUI, select Settings, and then System.(Additional virtual disks may always be added later.) Configure a virtual hard disk of 2GB ( dynamically allocated is fine), and of either VDI, VHD, or VMDK.In Expert Mode, the settings look like this:

Set Memory size to 1024MB (minimum recommended: 512MB). Select IBM OS/2 as Machine Type, and Other OS/2 as the Version.

The following assumes the use of the Oracle VM VirtualBox Manager GUI. This configuration still requires refinement for optimal use, and we are working with the VirtualBox team to improve the defaults.
