M.A. Hochberg’s Technology for Teaching

Has this happened to you or someone you know? You create a newsletter in your choice of word processor. You save the file as a PDF that you can send to your student’s parents. When you try to send the file, the mail program comes back and says the file is too big.

You check the original word processing file. It is 988KB, well under the limit. You check the pdf.  Instead of 988 KB, it is over ten times as large: 998 MB, far larger than the mail system allows.

What can you do? On Macs, the answer is in Preview, that useful little program that lets you look at things quickly and easily. Preview has been growing over the years and one very useful tool is “Save as.”

Hidden in the box labeled “Quartz Filter” is the useful option “Reduce File Size.” Saving at 998 MB file with this tool reduced it to 200KB, small enough to easily send through email.

We had some problems with the older Aversion document cameras communicating with the laptops. Everything is now working & here is what I discovered.

1. Most of the buttons, including the power button, on the camera freeze when the USB cord is plugged it. It is a known problem according to Avervision. The USB cable is needed transfer files from the document camera to the laptop. That includes viewing live images from the document camera on the laptop.
2. Don’t upgrade to Leopard 10.5.6. As of today, 3/5/09, Avervision software is not compatible with it.
3. Simply trashing the Avervision software does not completely uninstall the program. I deleted all files that had “Aver” in the name in the locations below.
   From their support site:
   http://support.aver.com/faq.php?do=article&articleid=532
   1) Trash the previous version of VisionAP software
   2) Trash AVerDig.component from Main Library/Quicktime
   3) Trash AVerDig.pkg from Main Library/Receipts
   4) Reinstall the update version again
4. Directions to using the software are on pages 3-5 of the installation manual. http://www.aver.com/presentation/downloads/avervision_installationguide_mac_083106.pdf

The Keychain program on Macs can be a lot of trouble, both serious and annoying. The serious part is that once you have logged onto your account, anyone can open anything. Not a good idea in an era of easily stolen laptops.

The annoying part is when you change your password, the Keychain doesn’t update everywhere, especially in Safari.

You can get the complete details on deleting your old keychain at

http://support.apple.com/kb/TA20852?viewlocale=en_US

I suggest stopping at step 6 as I don’t recommend creating a new keychain.

This does a fairly good job of resetting the keychain—except for Safari. After you have deleted the keychain and the file, open Safari and reset it.

This should stop Safari from continuing to prompt for a keychain password.

Dover Publications offers free weekly clip art from their many books, both old and new. This week’s children’s clip art includes sample pages from their American Presidents coloring book and American’s First Ladies coloring book. The sample pages are Barack and Michelle Obama.

http://www.doverpublications.com/samplerkids/0219/index.html

This link will only be good for a few weeks. New samples come out every week.

Weekly clip art is available in several different categories including Teachers, Children, and General.  To sign up for their free weekly clip art, go to

http://www.doverpublications.com/sampler4/

Here’s the latest set of changes to the hallway bulletin board and white board.

I plan to hang these in the lab and make copies available to teachers.

A few weeks ago, we had a rash of help calls from staff members inserting a DVD for the first time.  When they put in the DVD, up popped a message about region codes. This was confusing to people and resulted in phone calls for help.

If they were using a limited (i.e., student account) it would also ask them to authenticate the region. This was even more confusing, especially when all they wanted to do was watch a DVD.

Setting our school computers are set for Region 1 DVDs (US) at the time the computer arrives saves time and confusion latter on. All it takes is putting in a DVD and okaying the region setting.

For more information on DVD region settings, go to:

http://en.wikipedia.org/wiki/DVD_region

With so many models of Macs, it can be hard to know all the information about each machine. Here’s a free tool to make it easier: Mactracker

“Mactracker provides detailed information on every Apple Macintosh computer ever made, including items such as processor speed, memory, optical drives, graphic cards, supported Mac OS versions, and expansion options. Also included is information on Apple mice, keyboards, displays, printers, scanners, digital cameras, iPod, Apple TV, iPhone, Wi-Fi Cards/Base Stations, Newton, and Mac OS versions.”

Download the program to your computer and you have a quick, detailed reference to all Apple Products, including software.

http://mactracker.dreamhosters.com/

With the arrival of  new set of staff laptops, it was time to update the Golden image of our staff hard drives. My original list of programs to install

http://blogs.4j.lane.edu/hochberg_m/2008/12/11/how-many-programs-go-on-a-new-teacher-computer/

has grown. I’m now up to 27 items as I have added Carbon Copy Cloner, connections to 3 servers, and printers for all 5 Cows and the lab to the list.

While not everyone uses everything, all the items are used.

In 10.3 , there were “spurious permissions,” false positives when repairing permissions with Disk Utility. See http://blogs.4j.lane.edu/hochberg_m/2008/09/09/when-repairing-permissions-keeps-fixing-the-same-things/ In 10.5, they are “accurate but not a cause for concern.”

The two types of messages I see most often begin with “Warning: SUID file…” or “ACL found but not expected on…”

http://support.apple.com/kb/TS1448

Sometimes headsets are obviously broken—frayed wires, exposed copper, dangling earpieces. Too often the “broken headset” is quite repairable, however. The most common fixes are:

1. Turn the sound back on. Check the volume control icon. Is it muted or turned way down?
2. Is the plug in the correct socket? Often it is plugged into the “audio in” instead of “audio out”. Since this often happened on our desktop computers, I covered the audio in port with a piece of blue paper.
3. Is the plug in all the way? If it is not, the sound continues to come from the speakers.