[OSX-Users] Re: New 2015 MacBook

Fri May 22 13:10:54 BST 2015

The charging device supposed to negotiate the power available (normal USB too, but a lot of chargers are broken / ignore the spec).

It may well just give up if the power source can only offer 5W.

> On 22 May 2015, at 13:06, Chris Andrews <w at lfie.org> wrote:
> 
> There's the risk of an overheating 5W power supply though...
> 
> On Friday, May 22, 2015, Hugh Davis <hcd at soton.ac.uk <mailto:hcd at soton.ac.uk>> wrote:
> Ok - 29W is not so big - my current MacBook Air transformer is 45W , so presumably this is  lighter.
> 
> Charging off 5W would he slow -  but not necessarily useless. A useful trick Dder once showed me was that you can run a MacBook off a 12V power supply using the now unavailable 24V airplane charger. It does not charge the MacBook but it stops it discharging with use.  This is really useful if you spend lots of time in a car or campervan without access to 240V supplies e.g at a festival!
> 
> ========
> Hugh Davis
> Sent from my iPhone so please excuse typos.
> Co-ordinates at http://users.ecs.soton.ac.uk/hcd/ <http://users.ecs.soton.ac.uk/hcd/>
> My calendar is at http://users.ecs.soton.ac.uk/hcd/hcdcal.html <http://users.ecs.soton.ac.uk/hcd/hcdcal.html>
> 
> 
> On 22 May 2015, at 12:37, Jules Field <Jules at ecs.soton.ac.uk <javascript:;><mailto:Jules at ecs.soton.ac.uk <javascript:;>>> wrote:
> 
> The MacBook comes with a 29W USB-C charger. Your usual USB power supplies are only 5W, or at most 12W in the case of newer iPad models. It would take one a *very* long time to charge a MacBook at 5W.
> 
> Jules.
> 
> On 22/05/2015 11:58, Hugh Davis wrote:
> But presumably that means an enormous heavy transformer, which rather
> defeats the purpose!
> 
> /h.
> Hugh Davis
> Professor of Learning Technologies
> Director of Institute for Learning, Innovation and Development (ILIaD)
> Tel:  +44 (0)23 8059 3669
> Building 32 Room 3045
> Highfield Campus, University of Southampton, SO17 1BJ, UK
> Co-ordinates at http://users.ecs.soton.ac.uk/hcd/ <http://users.ecs.soton.ac.uk/hcd/>
> My calendar is at http://users.ecs.soton.ac.uk/hcd/hcdcal.html <http://users.ecs.soton.ac.uk/hcd/hcdcal.html>
> 
> 
> 
> 
> On 22/05/2015 11:13, "Steve Harris" <steve at totl.net <javascript:;><mailto:steve at totl.net <javascript:;>>> wrote:
> 
> Yes, the new MacBooks are charged over USB-C.
> 
> USB-C can carry 100W, so in theory lots of things could run off USB-C in
> the future. Itąs enough power to run a 50˛ TV.
> 
> On 22 May 2015, at 10:54, Hugh Davis <hcd at soton.ac.uk <javascript:;><mailto:hcd at soton.ac.uk <javascript:;>>> wrote:
> 
> I saw a few reviews suggesting that the CPU power would be a downgrade
> on existing MacBook airs.
> 
> Iąm not sure that CPU speed is ever an issue for the sort of activities
> I undertake  its usually been disk speed,  and even that seems to have
> been an insignificant problem since I got SSD or hybrid disks.
> 
> 
> ALSO
> Still slightly worried about the single USB C slot.  In effect I have
> to always remember to carry around some extra device in order to charge
> my iPhone from my PC. when its charging?
> 
> And Finally.
> It would be nice if they produced a PC that could be charged from a USB
> supply as an iPad can!  I presume this is not the case here?
> 
> Any thoughts.?
> /h.
> 
> 
> Hugh Davis
> 
> Professor of Learning Technologies
> 
> Director of Institute for Learning, Innovation and Development (ILIaD)
> 
> Tel:  +44 (0)23 8059 3669
> 
> Building 32 Room 3045
> 
> Highfield Campus, University of Southampton, SO17 1BJ, UK
> 
> Co-ordinates at http://users.ecs.soton.ac.uk/hcd/ <http://users.ecs.soton.ac.uk/hcd/>
> 
> My calendar is at http://users.ecs.soton.ac.uk/hcd/hcdcal.html <http://users.ecs.soton.ac.uk/hcd/hcdcal.html>
> 
> From: Jules Field <Jules at ecs.soton.ac.uk <javascript:;><mailto:Jules at ecs.soton.ac.uk <javascript:;>><mailto:Jules at ecs.soton.ac.uk <javascript:;>>>
> Organization: University of Southampton
> Reply-To: List for users of Mac OS X
> <osx-users at ecs.soton.ac.uk <javascript:;><mailto:osx-users at ecs.soton.ac.uk <javascript:;>><mailto:osx-users at ecs.soton.ac.uk <javascript:;>>>
> Date: Friday, 22 May 2015 11:39
> To: List for users of Mac OS X
> <osx-users at ecs.soton.ac.uk <javascript:;><mailto:osx-users at ecs.soton.ac.uk <javascript:;>><mailto:osx-users at ecs.soton.ac.uk <javascript:;>>>
> Subject: [OSX-Users] Re: New 2015 MacBook
> 
> All models have 8GB RAM.
> 
> 256GB ssd and 1.1GHz cpu = Ł902
> 256GB ssd and 1.3GHz cpu = Ł1074
> 
> 512GB ssd and 1.2GHz cpu = Ł1117
> 512GB ssd and 1.3GHz cpu = Ł1220
> 
> Then you'll want an AV multiport adapter (either HDMI or VGA version) =
> Ł65
> That provides a USB-C socket (so you can charge while showing a
> presentation), normal USB, and either HDMI or VGA.
> 
> So top-of-the-range = Ł1285 for the package. But I'm not convinced the
> 1.2GHz->1.3GHz upgrade is worth having, so you could knock roughly Ł100
> off that.
> 
> All prices include VAT.
> 
> One thing I have noticed is quite how fast the SSD is. Installing my
> 30GB system image from a USB disk takes 3 minutes, compared to 6 minutes
> for a MacBook Pro Retina and over 20 minutes for a "spinning rust"
> disk-based Mac.
> 
> Hope that helps,
> Jules.
> 
> 
> On 22/05/2015 10:26, Tim Chown wrote:
> So whatąs the damage for one of those?
> 
> Tim
> 
> On 21 May 2015, at 15:21, Jules Field
> <Jules at ecs.soton.ac.uk <javascript:;><mailto:Jules at ecs.soton.ac.uk <javascript:;>><mailto:Jules at ecs.soton.ac.uk <javascript:;>>> wrote:
> 
> If anyone would like to see one in the flesh, I've got one in my office
> you are welcome to come and look at.
> Zepler 4211, by the lift.
> 
> - Weight under 1kg (lighter than MacBook Air)
> - Thinner than the MacBook Air
> - Brand new keyboard
> - Force Touch trackpad
> - No fans, no moving parts at all (even the keys only *just* move)
> - 10 hours battery life
> - 1.1/1.2/1.3GHz Core M cpu
> - 8GB RAM
> - 512GB SSD storage
> - Retina display (12", 2304x1440 pixels)
> 
> Jules
> 
> --
> Jules Field MEng MBCS CITP CEng
> email+iMessage: Jules at ecs.soton.ac.uk <javascript:;><mailto:Jules at ecs.soton.ac.uk <javascript:;>><mailto:Jules at ecs.soton.ac.uk <javascript:;>>
> Twitter: @JulesFM
> 
> Senior Tutor, Postmaster
> Electronics and Computer Science
> University of Southampton SO17 1BJ, UK
> 
> 
> 
> 
> 
> Jules
> 
> --
> Jules Field MEng MBCS CITP CEng
> email+iMessage: Jules at ecs.soton.ac.uk <javascript:;><mailto:Jules at ecs.soton.ac.uk <javascript:;>><mailto:Jules at ecs.soton.ac.uk <javascript:;>>
> Twitter: @JulesFM
> 
> Senior Tutor, Postmaster
> Electronics and Computer Science
> University of Southampton SO17 1BJ, UK
> 
> 'There is silent poetry in the stillness of morning;
> in the calm, the cries & sighs of life sound like gentle music.'
> - @Astro_Wheels
> 
> 
> 
> 
> 
> 
> Jules
> 
> --
> Jules Field MEng MBCS CITP CEng
> email+iMessage: Jules at ecs.soton.ac.uk <javascript:;><mailto:Jules at ecs.soton.ac.uk <javascript:;>>
> Twitter: @JulesFM
> 
> Senior Tutor, Postmaster
> Electronics and Computer Science
> University of Southampton SO17 1BJ, UK
> 
> 
> 

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