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70 lines
4.3 KiB
ReStructuredText
70 lines
4.3 KiB
ReStructuredText
.. include:: /include.rst
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|machine| Machine
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=================
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The **Machine** page contains settings related to the emulated machine as a whole, such as the machine type, CPU type and amount of memory.
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Search / Machine type / Machine
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-------------------------------
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Machine/motherboard model to emulate. The *Machine* box lists all available models for the machine class selected on the *Machine type* box, while the *Search* box allows for finding and selecting a model from any class directly by name.
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The *Configure* button opens a new window with settings specific to the machine, such as BIOS type selection.
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.. note:: Settings for the machine's on-board devices have been moved to the *Configure* buttons at the devices' respective locations; for instance, configuring the amount of installed video memory for an on-board video chip is now done through the *Configure* button next to the :ref:`Display page's Video box <settings/display:Video>` when the *Internal device* option is selected there.
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CPU type / Speed
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----------------
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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.
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FPU
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---
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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.
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Wait states
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-----------
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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.
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PIT mode
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--------
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Programmable Interval Timer emulation mode. **Auto** should cover most use cases, automatically selecting **Fast** mode on 486-class and newer processors or **Slow** mode on older ones. A limited set of timing-sensitive applications require **Slow** mode, which is slower but more accurate.
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Memory
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------
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Amount of RAM to give the emulated machine. The minimum and maximum allowed amounts of RAM will vary depending on the machine selected above.
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Dynamic Recompiler
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------------------
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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.
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.. note:: The recompiler can be disabled temporarily (even on processors where it is mandatory) through an option on the :ref:`toolbar <usage/toolbar:|interpreter| |recompiler| Toggle recompilation>` and :ref:`Action menu <usage/menubar:Action>`, in the unlikely event that an application performs worse with the recompiler enabled. Selecting this temporary option again or restarting 86Box will reenable the recompiler.
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Softfloat FPU
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-------------
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Enable a slower but more accurate math co-processor emulation, for running a limited set of operating systems and applications which demand full 80-bit precision from the floating point unit.
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Time synchronization
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--------------------
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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.
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* **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.
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* **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.
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* **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.
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CPU frame size
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--------------
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Change the emulator's frame timing behavior. This mostly affects the smoothness of the emulated mouse and other input peripherals.
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* **Larger frames (less smooth):** same behavior as 86Box 4.2.1 and older. Switching to it may improve performance on low-end host systems, at the expense of reduced input smoothness.
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* **Smaller frames (smoother):** the new default behavior introduced in 86Box 5.0, which improves input smoothness.
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