TargetDisplayMode
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Target Display Mode on new iMacs limited to Thunderbolt sources (updated)
Cast your minds back to the launch of the 27" iMac in mid-2009. One of the new features was Target Display Mode, which introduced the ability to use the iMac as a pure external monitor, bypassing the built-in computer entirely. This could be useful if you wanted to dock a laptop to a big screen temporarily -- or if you were worried that the substantial investment in a 27" screen would, in years to come, be hobbled by the aging CPU and GPU inside the iMac. The theory was that you could eventually just stop using everything but the display. However, Apple has quietly dropped substantially modified the feature on the latest iMacs, which were announced today. For one, the Apple knowledgebase article describing the feature specifically mentions it is for "iMac (27-inch, Mid 2010), iMac (27-inch, Late 2009)," excluding the newest model. For two, while this archive of the old model's tech specs page states "27-inch models also support input from external DisplayPort sources," there is no such mention on the updated page for today's model. UPDATE: MacRumors spoke with an Apple rep who said the feature is still supported on the new models (through the Thunderbolt ports), despite not being mentioned on the tech specs page. UPDATE 2: Macworld has confirmation from Apple that the new iMacs will support Target Display Mode, but only when the device they are connected to is also a Thunderbolt-equipped Mac; the trick won't work with older mini DisplayPort models. So, a new MacBook Pro connected to a new iMac will work, but older MacBook Pros will not, and a current MacBook Air won't work either. This also means the popular Kanex adaptors (which convert HDMI signals to mini DisplayPort ones, letting users plug things like game consoles into their iMacs) probably won't work with the new iMacs -- we've contacted Kanex to ask for confirmation. This change is probably tied to the mini DisplayPort being replaced by two Thunderbolt ports. Whatever clever hack Apple did to make the mini DisplayPort connection bi-directional in the earlier iMacs is presumably difficult or impossible to replicate through Thunderbolt, as it has less control over the protocol (remember that Thunderbolt is an Intel design, and uses a special Intel communications chip). UPDATE 3: Consider that, for legacy mini-DisplayPort devices to work, the Thunderbolt interface would need to consume a raw display signal -- not one wrapped up in the clever Thunderbolt protocol (note, PDF link), which combines PCIe and DisplayPort data into a single stream. This is probably why the new Thunderbolt ports cannot maintain backwards compatibility with older devices. However, when the device sending the signal also has Thunderbolt, they can negotiate a way to send the signal that the receiver can understand. What do you think, readers -- was Target Display Mode always a pointless curiosity, or do you think this is a loss for the iMac's feature set? Has anyone out there used Target Display Mode in anger?
Ask TUAW: Simple spreadsheets, partitioning with Time Machine, iTunes with a NAS, and more
Welcome back to Ask TUAW, our weekly troubleshooting Q&A column. This week we've got questions about sharing peripherals, simple spreadsheets, backup configurations, using a NAS, and more. As always, your suggestions and questions are welcome. Leave your questions for next week in the comments section at the end of this post. When asking a question, please include which machine you're using and what version of Mac OS X is installed on it (we'll assume you're running Snow Leopard on an Intel Mac if you don't specify).
TUAW Holiday Gift Guide: Displays
A display, whether it's a primary, extra display for a portable, or a desktop secondary, is something that's very useful, and makes a great gift. Here's a few gift ideas for displays to use with your Mac. Dell ST2210 This display offers a 1920x1080 resolution, a 21.5 inch viewing area, and is available for only $189. It has a DVI and VGA port, which means that you might need an adapter to connect it. There's also a 24 inch model of this display, the Dell ST2410, if you're looking for something a little bit bigger. Samsung XL2370 If you're wanting another option, there's the Samsung XL2370. It's LED backlit, like the Apple LED Cinema Display, and can be purchased for around $399. It has a display resolution of 1920x1080, and it features a DVI and HDMI port, so you'll need an adapter to hook it up to a Mac with a Mini-DVI or Mini DisplayPort. Apple LED Cinema Display The Apple LED Cinema Display offers unique features that make it easy to connect to a Mac, like the MagSafe connector that charges a MacBook. The display is measured at 24 inches, and can display a 1900x1200 resolution. It also features a built-in iSight camera, a mic, speakers, and a three-port USB hub. You can purchase it for $899, though refurbished models have shown up for $599 from Apple. 27 inch iMac The 27-inch iMac, can be used in Target Display Mode as a monitor for another Mac with a Mini DisplayPort. It offers a resolution of 2560x1440 pixels, and it's LED backlit. You'll just need a cable to do so, and you can purchase a Mini DisplayPort to Mini DisplayPort cable from Apple or Monoprice. Of course, the iMac is a computer, so we aren't suggesting using it primarily as an external display. Do you have any suggestions for displays? Leave a comment and let us know!
Ask TUAW: iMac processor upgrade, 27" iMac as display, wireless input devices, and more
Happy holiday, and welcome back to Ask TUAW, our weekly troubleshooting Q&A column. This week we've got questions about upgrading an iMac processor, using the 27" iMac as a display, sharing a Magic Mouse and Bluetooth keyboard with a Linux machine, and more. As always, your suggestions and questions are welcome. Leave your questions for next week in the comments section at the end of this post. When asking a question, please include which machine you're using and what version of Mac OS X is installed on it (we'll assume you're running Snow Leopard on an Intel Mac if you don't specify). And now, on to the questions.
Apple document details Target Display mode for 27" iMac
In case you're itching to use that new 27" iMac as a big display for a MacBook, DVD player, or some other device -- and assuming your new unit isn't one of the ones that has shown up DOA or with a cracked screen corner -- Apple has released a knowledge base article gives you the scoop on how to do it all. The article, titled "Using a 27-inch iMac as an external display" outlines how easy it is to accomplish this: Make sure both computers are turned on and awake. Connect a male-to-male Mini DisplayPort cable to the Mini DisplayPort on each computer. The 27-inch iMac will enter Target Display Mode and display content from the source computer. Note: If you are connecting two 27-inch iMacs, connect a Mini DisplayPort cable to each computer and press Command + F2 on the 27-inch iMac keyboard that you will use as an external display. To leave Target Display mode, press Command + F2 on the keyboard of the 27-inch iMac that is in Target Display mode. To return to Target Display mode, press Command + F2 again. The post goes on to describe special conditions that may affect use of Target Display mode, and notes that third-party converters may be used to provide the Mini DisplayPort compliant signals needed for this mode. Have any of you used a 27" iMac as an external display for another machine or device? Let us know by leaving your comment below.
