Hal Murray | 25 Apr 02:53 2016
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Re: Dark or darker display


quozl <at> laptop.org said:
> The XO-4 display has a much brighter backlight.  It proved impossible to
> find such dark LEDs as used to exist. 

Do they take more power or are they more efficient?

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Martin Langhoff | 25 Apr 00:10 2016
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Re: [UKids] re:new member

As Sam says xo-1 screens will work on xo-4 touch units. Disassembly and reassembly of xo4 touch around the screen is delicate, careful with the touchscreen data cable.

Over time we made small changes to the LCD screen but they don't make a big difference. They all fit all production units.

hth,

m

On 24 Apr 2016 5:46 p.m., "Samuel Greenfeld" <samuel <at> greenfeld.org> wrote:
The XO-4 is the only XO to have been officially sold with a touchscreen option.

XO-4s use the same screen as other XOs, but with an independent infrared touchscreen on top of it.

There were some XO-1.75s that were modified to have more traditional touchscreens to help with Sugar & XO-4 touch development.  These are mostly in the hands of developers, and are rare.

Over time durability enhancements have been made to XOs.  But I don't recall when what changes were made to the display. 

In general I would recommend using a newer display with touch XO-4s to reduce the risk of hard presses breaking the screen.


On Sun, Apr 24, 2016 at 11:13 AM, robb <robb <at> interlin.nl> wrote:
Sure the XO1 has no touch screen but was it the XO1.75 that had an option to have a touch screen? I don know if the xo1.75 and the xo4 have the same dimentions and connectors for the screens? Maybe you could fit an xo1.75 screen on an xo4?

Op 24-04-16 om 15:07 schreef Dave Crossland:

On 24 April 2016 at 07:34, Xo Tom <xo-tom <at> gmx.at> wrote:
I would like to use the Lcd of the Xo1 in the Xo4, replacing them. Do you think that works or could there be a problem with the touch function?

The XO-1 screen has no touch function
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Samuel Greenfeld | 24 Apr 23:45 2016

Re: [UKids] re:new member

The XO-4 is the only XO to have been officially sold with a touchscreen option.

XO-4s use the same screen as other XOs, but with an independent infrared touchscreen on top of it.

There were some XO-1.75s that were modified to have more traditional touchscreens to help with Sugar & XO-4 touch development.  These are mostly in the hands of developers, and are rare.

Over time durability enhancements have been made to XOs.  But I don't recall when what changes were made to the display. 

In general I would recommend using a newer display with touch XO-4s to reduce the risk of hard presses breaking the screen.


On Sun, Apr 24, 2016 at 11:13 AM, robb <robb <at> interlin.nl> wrote:
Sure the XO1 has no touch screen but was it the XO1.75 that had an option to have a touch screen? I don know if the xo1.75 and the xo4 have the same dimentions and connectors for the screens? Maybe you could fit an xo1.75 screen on an xo4?

Op 24-04-16 om 15:07 schreef Dave Crossland:

On 24 April 2016 at 07:34, Xo Tom <xo-tom <at> gmx.at> wrote:
I would like to use the Lcd of the Xo1 in the Xo4, replacing them. Do you think that works or could there be a problem with the touch function?

The XO-1 screen has no touch function
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Adam Holt | 24 Apr 17:01 2016

Re: [UKids] re:new member

On Sun, Apr 24, 2016 at 9:07 AM, Dave Crossland <dave <at> lab6.com> wrote:

On 24 April 2016 at 07:34, Xo Tom <xo-tom <at> gmx.at> wrote:
[I also use the xo4 indoors in black/white mode because for longer texts reading and writing the monochrome display is more convenient than conventional color displays.
And that already leads to my hardware question, because the contrast in black/white of the Xo4 is not as good as the Xo1. The Xo4 has a darker display than the Xo1. Is there a special reason why the new display is darker?] I would like to use the Lcd of the Xo1 in the Xo4, replacing them. Do you think that works or could there be a problem with the touch function?

The XO-1 screen has no touch function

My recollection is the XO-4 Touch laptop has the same core LCD screen technology as XO-1 except for some physical tabs to make it (the very same 1200x900 LCD's originated from Mary Lou Jepsen & All) fit in a bit differently.

I could be wrong, but possibly these new plastics-or-metallic bits allow the screen to bounce better on dropping of the laptop, to reduce screen shattering?

Certainly the (multi)touch functionality of XO-4 Touch screens arise from IR (InfraRed) sensors that stand physically above the LCD screen by a few millimeters.

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Jhon Diaz | 23 Apr 01:28 2016
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olpc slackware

Anyone mirrors for slackware for olpc 13.37 i wanna make my xo-1 into a low end file server
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Adam Holt | 29 Mar 23:16 2016

Re: [Power] replacement RTC batteries for XO-1 and XO-1.5; which are recommended?

On Tue, Mar 29, 2016 at 5:08 PM, Adam Holt <holt <at> laptop.org> wrote:
On Tue, Mar 29, 2016 at 4:54 PM, Paul Fox <pgf <at> laptop.org> wrote:
it's an ML1220.

    http://wiki.laptop.org/go/Fix_Clock#Check_the_battery_and_holder

Thanks!!

I'll try to see if Nathan Riddle has expertise obtaining many hundred -- for XO-1 especially at this point -- but later the pony-tailed versions might in future need to procured for XO-1.5+

(We'll take note to *avoid* the "CR1220" as mentioned on the page above!)


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Adam Holt | 29 Mar 21:55 2016

replacement RTC batteries for XO-1 and XO-1.5; which are recommended?

Does anyone have recommended RTC battery model number(s) handy for XO-1 and XO-1.5?  In context with these very useful RTC (Real-Time-Clock on motherboard) rescue/maintenance tips here:

Evidently some schools prefer a clean start, replacing all their RTC batteries now that XO-1 laptops especially are approaching a decade of life.  Depending what RTC prices and Minimum Order Quantities are forthcoming in 2016+ of course -- both for smaller & larger operations -- perhaps Nathan has an idea?

(Less urgent, but recommended RTC battery model numbers for XO-1.75 and XO-4 would be wonderful too, if handy?)

Aside: http://wiki.laptop.org/go/Reuse_checklist is an excellent more comprehensive list of refurbishing tactics for those interested!
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Kevin Gordon | 21 Mar 16:56 2016
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Re: [support-gang] [UKids] Glueing SD cards into XO laptops

On NCR's idea ... A little caveat .... One must be very very careful of the read-only tab lock when messing 'directly'  with adapters and cards though.  They are a feces show to begin with, and if you need to r/w on the little beasts, small physical changes can mess up the r/w function, even if not physically, sometimes their alignment.

On Mon, Mar 21, 2016 at 11:38 AM, <nathanr333 <at> charter.net> wrote:
Adam,

My suggestion is a variation of Kevin's.   Adhesive strip on SD card (exposed 1/8 th inch).  This would require removing XO back to remove strip /card.

Second variation:  jam lock/unlock tab.  There is a slot in the card holder metal can.   Inserting a small plastic piece (tape in place) will block the tab so SD card can not be removed..

Nathan

-----------------------------------------

From: "Kevin Gordon"
To: "Adam Holt"
Cc: "Unleash Kids!", "Devel's in the Details", "Community Support Volunteers -- who help respond to help AT laptop.org"
Sent: Mon, 21 Mar 2016 10:48:53 -0400
Subject: Re: [support-gang] [UKids] Glueing SD cards into XO laptops

Adam, we tried silicon over the slot applied from the inside, not glue.  :-)  Cards fail, and removing them once the case is off, without causing damage, was also a 'use case'.

What ended up being a more reliable method to prevent theft, was not using micro-SD's in adapters, but only full size cards.  Then, one educates the students that the cards have great value in the machines, and because of their size and 'formatting', virtually zero use outside of them.  Manually monitoring the machines state also works when they are used mainly in classroom settings and are 'assigned' to specific students.  Very few of our user base have the ability to quickly take a case apart, or know how to repartition cards that use unix file systems.  Since there are also few devices in the environment which can take a native full size card, the trouble to steal them, is usually more than it's worth.

Depending on your user stories, to quote the vernacular, your mileage may vary.

KG



On Mon, Mar 21, 2016 at 10:32 AM, Adam Holt <holt <at> laptop.org> wrote:

As many thousands of SD cards are now being considered to be retrofit into legacy XO's, in quite exciting new experiments with content-packed OS's, Kevin Gordon is way ahead of us all as usual:

What glues do people recommend, to reduce temptation from young kids who fidget/grab anything they can?

Can we come up with the best glues/brand-names/techniques to mitigate this very real problem, that small objects wander off, in small hands especially?

Also a somewhat more permanent glue is desired by many schools I talk to, who face a very real risk of overt theft, as 32GB or 64GB SD cards represent a week or a fortnight's salary for a teacher/janitor in many of the countries where we work :-(

The equivalent in NYC (where an increasing number of teachers are paid $100,000+/year) might be to leave $4000 gold coins on every student's desk, and to very naively/pretentiously expect none will walk :-)

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Adam Holt | 21 Mar 15:32 2016

Glueing SD cards into XO laptops

As many thousands of SD cards are now being considered to be retrofit into legacy XO's, in quite exciting new experiments with content-packed OS's, Kevin Gordon is way ahead of us all as usual:

What glues do people recommend, to reduce temptation from young kids who fidget/grab anything they can?

Can we come up with the best glues/brand-names/techniques to mitigate this very real problem, that small objects wander off, in small hands especially?

Also a somewhat more permanent glue is desired by many schools I talk to, who face a very real risk of overt theft, as 32GB or 64GB SD cards represent a week or a fortnight's salary for a teacher/janitor in many of the countries where we work :-(

The equivalent in NYC (where an increasing number of teachers are paid $100,000+/year) might be to leave $4000 gold coins on every student's desk, and to very naively/pretentiously expect none will walk :-)

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Adam Holt | 7 Mar 01:36 2016

Re: [UKids] Re: Non-Network Time Protocol for Haiti?

On Sun, Mar 6, 2016 at 6:58 PM, Tony Anderson <tony_anderson <at> usa.net> wrote:
Adam

I have a script that attempts to accomplish this through ds_backup. The goal is to have all of the clients with the same time as the school server (may not be internet accurate but at least gives some consistency to time stamps). The problem is that this must be done by a command issued from a tty. In the case
of xsce, this could be done at connect-time when the XO1 time is off by more than X.

Cool, please post?

My problem is there are many school in Haiti that do not and will not have school servers -- for the forseeable future -- so let's attack this problem from both angles -- thanks!

Tony


On 03/07/2016 01:19 AM, Adam Holt wrote:
(Apologies I forgot to mention that auto-mounting and auto-dismounting the USB stick is likely the hard part -- untrained teachers simply cannot handle mount-point ambiguities, if they can handle the command-line at all -- suggestions on how to solve this elegantly most appreciated!)

PS we are happy to mandate that teachers must supply an empty/formatted FAT32 stick or similar if that's the best practice?

On Sun, Mar 6, 2016 at 12:08 PM, Adam Holt <holt <at> laptop.org> wrote:
In short, http://NTP.org - by - sneakernet, not carrier pigeon :>


On Sun, Mar 6, 2016 at 12:06 PM, Adam Holt <holt <at> laptop.org> wrote:
Clarifs below~

On Sun, Mar 6, 2016 at 11:51 AM, Adam Holt <holt <at> laptop.org> wrote:
In Haiti many teachers and kids would prefer the time was set correctly on their XO-1 laptops, no matter if the time is off by a couple minutes.  So they could really use a script that creates the following /boot/olpc.fth, writing it out to an attached USB stick:
\ Open Firmware select /rtc decimal 0 0 0 1 1 1804 set-time \ Optionally unlock XO disable-security Then the teacher/operator can walk around the room to fix all XO's clocks (refreshing the USB time as often as she/he wants).  Of course not every day can be Haitian Independence Day (Jan 1 1804!) so what the script should really do is create a timestamp 1 minute into the future, filling out those 6 numbers above correctly.

The untrained operator (teacher typically) will then move the USB stick to the XO(s) in need, to set their RTC's (real-time-clocks).  Some ambitious teachers will want to do this every month/semester it appears, to sanitize/harmonize all clocks in their classroom/school as much as possible!

Any recommended approaches to getting the UX clean, so that such untrained operator have a visual confirmation that the USB stick has been updated with a proper time-stamp, and (perhaps just as important??) the stick mounted+unmounted effortlessly without too much risk, when this USB stick is recreated hundreds of times within 1 day?  A non-confusing command line script can work, that says basically 2 things:
  • PLEASE INSERT A USB STICK
  • USB STICK READY: REMOVE IT NOW!
The less keyboard activity required from the teacher the better.  But I'm tempted by command syntax as follows:

usb-timestamper <minutes-into-the-future>
 
Such that running "/bin/usb-timestamper 5" would create USB sticks timestamped 5 minutes into the future.  The default should be 1 minute into the future, so running "/bin/usb-timestamper" would be equivalent to "/bin/usb-timestamper 1".

Conclusion: am just looking for general suggestions from everyone as we cook up something simple!

We do not want to rely on networking or mesh At All.  KISS (key it simple/stupid) at the firmware level allows the teacher/operator to move thru the classroom quite rapidly, fixing the time on each XO laptop as often as s/he wants.  2 examples scenarios, showing how this will be used:
  1. Teacher/operator may choose to run "usb-timestamper 10" once as s/he enters each classroom, if she wants to timestamp the USB stick 10min into the future, and then apply this rapidly to all 50 XO's in a classroom/lab over the coming 20minutes.  Works great ifs/he does not care that the XO's clocks are off by +/- 10min!
  2. Or if teacher/operator is perfectionist, then usb-timestamper (interactive command-line program) can be left running on hir own XO laptop that s/he carries around the room -- updating the USB stick repeatedly while walking around the classroom -- such that each of that room's 50 XO laptops has an almost-exact clock, accurate within a minute or so.
 
in this case, as USB sticks are the most reliable and quick approach in this case.

Clarif: I will of course train the teacher/operator to set the clock correctly on their own XO-1, which will typically be running OLPC OS 13.2.7 -- so that all these "offline-NTP sticks" are created based on a reasonably accurate baseline timestamp :)

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Adam Holt | 6 Mar 17:51 2016

Non-Network Time Protocol for Haiti?

In Haiti many teachers and kids would prefer the time was set correctly on their XO-1 laptops, no matter if the time is off by a couple minutes.  So they could really use a script that creates the following /boot/olpc.fth, writing it out to an attached USB stick:
\ Open Firmware
select /rtc decimal 0 0 0 1 1 1804 set-time
\ Optionally unlock XO
disable-security
Then the teacher/operator can walk around the room to fix all XO's clocks (refreshing the USB time as often as she/he wants).  Of course not every day can be Haitian Independence Day (Jan 1 1804!) so what the script should really do is create a timestamp 1 minute into the future, filling out those 6 numbers above correctly.

The untrained operator (teacher typically) will then move the USB stick to the XO(s) in need, to set their RTC's (real-time-clocks).  Some ambitious teachers will want to do this every month/semester it appears, to sanitize/harmonize all clocks in their classroom/school as much as possible!

Any recommended approaches to getting the UX clean, so that such untrained operator have a visual confirmation that the USB stick has been updated with a proper time-stamp, and (perhaps just as important??) the stick mounted+unmounted effortlessly without too much risk, when this USB stick is recreated hundreds of times within 1 day?  A non-confusing command line script can work, that says basically 2 things:
  • PLEASE INSERT A USB STICK
  • USB STICK READY: REMOVE IT NOW!
The less keyboard activity required from the teacher the better.  But I'm tempted by command syntax as follows:

usb-timestamper <minute-into-the-future>

Such that running "/bin/usb-timestamper 5" would create USB sticks timestamped 5 minutes into the future.  The default should be 1 minute into the future, so running "/bin/usb-timestamper" would be equivalent to "/bin/usb-timestamper 1".

Conclusion: am just looking for general suggestions from everyone as we cook up something simple!  We do not want to rely on networking of mesh at all in this case, as USB sticks are the most reliable and quick approach in this case.

Clarif: I will of course train the teacher/operator to set the clock correctly on their own XO-1, which will typically be running OLPC OS 13.2.7 -- so that all these "offline-NTP sticks" are created based on a reasonably accurate baseline timestamp :)

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