| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="emul-hardware">
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| 4 | <title>Emulated Hardware</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | <ph conkeyref="vbox-conkeyref-phrases/product-name"/> virtualizes nearly all hardware of the host.
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| 9 | Depending on a VM's configuration, the guest will see the
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| 10 | following virtual hardware:
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| 11 | </p>
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| 12 | <ul>
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| 13 | <li>
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| 14 | <p><b outputclass="bold">Input devices.</b> <ph conkeyref="vbox-conkeyref-phrases/product-name"/>
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| 15 | can emulate a standard PS/2 keyboard and mouse. These devices
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| 16 | are supported by most guest OSes.
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| 17 | </p>
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| 18 | <p>
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| 19 | In addition, <ph conkeyref="vbox-conkeyref-phrases/product-name"/> can provide virtual USB input
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| 20 | devices to avoid having to capture mouse and keyboard, as
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| 21 | described in <xref href="keyb_mouse_normal.dita#keyb_mouse_normal"/>.
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| 22 | </p>
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| 23 | </li>
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| 24 | <li>
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| 25 | <p><b outputclass="bold">Graphics.</b> The default
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| 26 | <ph conkeyref="vbox-conkeyref-phrases/product-name"/> graphics device for Windows guests is an SVGA
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| 27 | device. For Linux guests, the default graphics device emulates
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| 28 | a VMware SVGA graphics device. See
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| 29 | <xref href="settings-screen.dita#settings-screen"/>.
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| 30 | </p>
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| 31 | <p>
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| 32 | For legacy guest OSes, a VGA-compatible graphics device is
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| 33 | available.
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| 34 | </p>
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| 35 | </li>
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| 36 | <li>
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| 37 | <p><b outputclass="bold">Storage.</b> <ph conkeyref="vbox-conkeyref-phrases/product-name"/>
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| 38 | emulates the most common types of hard disk controllers. See
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| 39 | <xref href="harddiskcontrollers.dita#harddiskcontrollers"/>. Whereas supporting
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| 40 | only one of these controllers would be enough for
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| 41 | <ph conkeyref="vbox-conkeyref-phrases/product-name"/> by itself, this multitude of storage adapters
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| 42 | is required for compatibility with other hypervisors. Windows
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| 43 | is very selective about its boot devices, and migrating VMs
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| 44 | between hypervisors is very difficult or impossible if the
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| 45 | storage controllers are different.
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| 46 | </p>
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| 47 | </li>
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| 48 | <li>
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| 49 | <p><b outputclass="bold">Networking.</b> See
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| 50 | <xref href="nichardware.dita#nichardware"/>.
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| 51 | </p>
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| 52 | </li>
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| 53 | <li>
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| 54 | <p><b outputclass="bold">USB.</b> <ph conkeyref="vbox-conkeyref-phrases/product-name"/> emulates
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| 55 | these types of USB host controllers: xHCI, EHCI, and OHCI.
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| 56 | While xHCI handles all USB transfer speeds, some legacy guest
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| 57 | OSes may not support xHCI. Note that for some legacy Windows
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| 58 | guests, third party drivers must be installed for xHCI
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| 59 | support.
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| 60 | </p>
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| 61 | <p>
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| 62 | Legacy guest OSes typically support OHCI and EHCI. These two
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| 63 | controllers are needed because OHCI only handles USB low-speed
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| 64 | and full-speed devices (both USB 1.x and 2.0), while EHCI only
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| 65 | handles high-speed devices (USB 2.0 only).
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| 66 | </p>
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| 67 | <p>
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| 68 | The emulated USB controllers do not communicate directly with
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| 69 | devices on the host. Instead they communicate with a virtual
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| 70 | USB layer which abstracts the USB protocol and enables the use
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| 71 | of remote USB devices.
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| 72 | </p>
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| 73 | </li>
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| 74 | <li>
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| 75 | <p><b outputclass="bold">Audio.</b> See
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| 76 | <xref href="settings-audio.dita#settings-audio"/>.
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| 77 | </p>
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| 78 | </li>
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| 79 | </ul>
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| 80 | </body>
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| 81 |
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| 82 | </topic>
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