machine Machine

The Machine page contains settings related to the emulated machine as a whole, such as the machine type, CPU type and amount of memory.

Machine type / Machine

Machine/motherboard model to emulate. The Machine box lists all available models for the machine class selected on the Machine type box.

The Configure button opens a new window with settings specific to the machine’s onboard devices, such as the amount of installed video memory for an onboard video chip.

CPU type / Speed

Main processor to emulate. The Speed box lists all available speed grades for the processor family selected on the CPU type box. These boxes only list processor types and speed grades supported by the machine selected above.


Math co-processor to emulate. This box is not available if the processor selected above has an integrated co-processor or lacks support for an external one.

Wait states

Number of memory wait states to use on a 286- or 386-class processor. This box is not available if any other processor family is selected above.


Amount of RAM to give the emulated machine. The minimum and maximum allowed amounts of RAM will vary depending on the machine selected above.

Dynamic Recompiler

Enable the dynamic recompiler, which provides faster but less accurate CPU emulation. The recompiler is available as an option for 486-class processors, and is mandatory starting with the Pentium.

Time synchronization

Automatically copy your host system’s date and time over to the emulated machine’s hardware real-time clock. Synchronization is performed every time the emulated operating system reads the hardware clock to calibrate its own internal clock, which usually happens once on every boot.

  • Disabled: do not perform time synchronization. The emulated machine’s date and time can be set through its operating system or BIOS setup utility. Time only ticks while the emulated machine is running.

  • Enabled (local time): synchronize the time in your host system’s configured timezone. Use this option when emulating an operating system which stores local time in the hardware clock, such as DOS or Windows.

  • Enabled (UTC): synchronize the time in Coordinated Universal Time (UTC). Use this option when emulating an operating system which stores UTC time in the hardware clock, such as Linux.