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by Clifford
Sun Mar 03, 2013 10:19 am
Forum: Troubleshooting
Topic: Printing to Canon iP4700 Windows' share with CUPS
Replies: 2
Views: 1162

Printing to Canon iP4700 Windows' share with CUPS

I am trying to set up CUPS to print to a Canon iP4700 on a Windows' share. There are a number of issues (in order of seriousness): CUPS test pages (and any other GUI app print job) appear briefly in the Windows print queue, then disappear without printing. Plain text files print successfully using t...
by Clifford
Mon Sep 03, 2012 5:38 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

Well, I've just updated to the 2012-08-16 distribution and done a full update and I don't see any improvement yet. May have been my imagination. I just did an apt-get dist-upgrade, which certainly installed a scratch replacement and it seems almost as bad as it was originally. Additionally it stopp...
by Clifford
Sun Aug 26, 2012 11:10 am
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

At any rate that is 'viable' and suited for intended purpose, from my point of view. My original tests were with the un-updated distribution. With each apt-get update/apt-get upgrade the situation seems to have improved. It also seems that certain constructs or features cause 100% CPU usage. There ...
by Clifford
Thu Aug 16, 2012 8:07 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

I am glad this discussion seems to have raised some interest in the community - it was a bit of a slow starter and I was not sure whether anyone was taking Scratch seriously. I enjoyed using it and think it covers a lot of important programming concepts in the kind to "instant gratification" way tha...
by Clifford
Thu Aug 16, 2012 4:11 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

If Clifford and his son (and people like Clifford and his son) give up on the RaspberryPi on 1st attempt then we need to try a bit harder to keep them on-board I'm not giving up on anything. My concern was to have this assessed since Scratch seems to have been chosen and a major feature of the educ...
by Clifford
Thu Aug 16, 2012 3:53 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

the next version of scratch 2.0, is apparently due sometime this year and it will be Flash based Flash is not supported on RPi AFAIK. rather than spending huge amounts of time optimising the legacy java stack imo. I thought it was implemented in Squeak (a Smalltalk implementation with a virtual mac...
by Clifford
Mon Aug 13, 2012 7:06 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

It certainly ran faster without the variable display, which I have used here for score and lives display but the feature to display them is presumably intended as a debug aid. It is a shame that it appears to cripple teh tool. There was still a significant lag and first scratch hung then the entire ...
by Clifford
Fri Aug 10, 2012 9:48 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

I'll take a look at it as soon as possible. Apart from the execution performance, I had trouble even editing the code on the RPi. Even modifying the delays (which were essential to playability in Windows) was near impossible due to the lag between an action with the mouse and anything actually happe...
by Clifford
Fri Aug 03, 2012 5:53 pm
Forum: Beginners
Topic: Sound in Scratch
Replies: 21
Views: 13146

Re: Sound in Scratch

You just need to type... sudo nano /usr/bin/scratch Doh! I was looking for a directory called /usr/bin/scratch and was wondering why @Sharks58uk was not being very specific about the file name! That is how I interpreted I found a script that I assume is written in smalltalk that runs when you run s...
by Clifford
Fri Aug 03, 2012 5:46 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

Hi Clifford, I really enjoyed playing your game. I haven't tried it on my Pi yet ... Thanks; I found a few other asteroids-type implementations on the Scratch site, I tried one that appeared to be most complete and it too ran very slowly. I noticed that the MagPi issue 4 is featuring a Frogger type...
by Clifford
Thu Jul 26, 2012 7:13 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Re: Is Scratch really viable on Raspberry Pi?

OK, I did a little research, and it seems that Scratch is written in Squeak Smalltalk which uses a virtual machine architecture. Great for cross-platform portability perhaps, but not so great for performance. So I think that Scratch performance is seriously compromised by its implementation, and hig...
by Clifford
Thu Jul 26, 2012 6:38 pm
Forum: Beginners
Topic: Sound in Scratch
Replies: 21
Views: 13146

Re: Sound in Scratch

It took me a while (and some research) to figure out why anyone would assume this was Smalltalk - seemed like the least likley choice. It is in fact just a Bash shell script. Any how in my Debian Wheezy image /usr/bin/scratch is an empty folder. The actual name of the file would be useful, or if any...
by Clifford
Thu Jul 26, 2012 6:15 pm
Forum: Scratch
Topic: Is Scratch really viable on Raspberry Pi?
Replies: 128
Views: 46148

Is Scratch really viable on Raspberry Pi?

My son has been using Scratch at school and has been asking me for help with his project (I am a professional software engineer). I decided to learn Scratch (didn't take long) in order to be able to help him. I wrote a simple Asteroids-like game in Scratch for Windows. It has 6 sprites - 4 identical...
by Clifford
Tue Jul 24, 2012 6:06 pm
Forum: Beginners
Topic: Automatic setup for RTL8188CUS based wifi adapters
Replies: 1147
Views: 675382

Re: Automatic setup for RTL8188CUS based wifi adapters

Before loading the script what did you do when the setup gui ran? First time partition resize and SSH; the second time left at defaults. The WiFi LED flashes for several minutes before finally going out. I'll try again at some point; the problem is that I only have one SD card at the moment, so swa...
by Clifford
Sat Jul 21, 2012 4:15 pm
Forum: Beginners
Topic: Automatic setup for RTL8188CUS based wifi adapters
Replies: 1147
Views: 675382

Re: Automatic setup for RTL8188CUS based wifi adapters

Before loading the script what did you do when the setup gui ran? First time partition resize and SSH; the second time left at defaults. The WiFi LED flashes for several minutes before finally going out. I'll try again at some point; the problem is that I only have one SD card at the moment, so swa...
by Clifford
Sat Jul 21, 2012 10:10 am
Forum: Beginners
Topic: Automatic setup for RTL8188CUS based wifi adapters
Replies: 1147
Views: 675382

Re: Automatic setup for RTL8188CUS based wifi adapters

I've been working with the Wheezy Beta for a while using a EW-7811Un configured with MrEngman's script. I created a new 2012-07-15-wheezy-raspbian card then with a wired connection did: sudo wget -O /boot/install-rtl8188cus-latest.sh http://dl.dropbox.com/u/80256631/install-rtl8188cus-latest.sh sudo...
by Clifford
Mon Jul 16, 2012 6:17 pm
Forum: Beginners
Topic: Automatic setup for RTL8188CUS based wifi adapters
Replies: 1147
Views: 675382

Re: Automatic setup for RTL8188CUS based wifi adapters

Later edit : Looks like I changed also in the /lib/modules/3.1.9+/kernel/net/wireless folder it is working I don't quite follow; are you saying that when you installed the driver in the alternate folder it worked? I'd like to know before I try dist-upgrade again, otherwise I'll leave the dust to se...
by Clifford
Sun Jul 15, 2012 8:00 pm
Forum: Beginners
Topic: Automatic setup for RTL8188CUS based wifi adapters
Replies: 1147
Views: 675382

Re: Automatic setup for RTL8188CUS based wifi adapters

In response to Paul_L: apt-get update should not cause a problem as far as I know. Do you mean you updated using rpi-update? I did: sudo apt-get update sudo apt-get dist-upgrade today, and the wireless stopped working exactly as Paul_L described. I have not used rpi-update at all on Wheezy Beta. I h...
by Clifford
Thu Jun 14, 2012 4:49 pm
Forum: Beginners
Topic: Logitech Wireless Touch Keyboard K400: Does it work for you?
Replies: 97
Views: 122902

Re: Logitech Wireless Touch Keyboard K400: Does it work for

I have the K400 working out-of-the-box with debian6-19-04-2012 without any specific configuration of the RPi. The "sticky keys" issue seems common, I am certainly experiencing that. However, I mostly see it only when using Midori. I am not sure if it is LXDE in general or Midori specifically, but th...
by Clifford
Thu May 31, 2012 7:40 pm
Forum: Troubleshooting
Topic: Netwok errors in LXDE with USB 1.0 hub
Replies: 6
Views: 1941

Re: Netwok errors in LXDE with USB 1.0 hub

Clifford - are you now running the 2 USB devices directly off the Pi with no powered hub?? Yes but only just, the keyboard/trackpad tends to drop-out especially in the web-browser. I still don't have a suitable PSU though. I have an old powered USB 1.0 hub on which I tried to use the keyboard dongl...
by Clifford
Wed May 30, 2012 10:35 pm
Forum: Troubleshooting
Topic: Netwok errors in LXDE with USB 1.0 hub
Replies: 6
Views: 1941

Re: Netwok errors in LXDE with USB 1.0 hub

@usbspyder I now have the RPi working with a Logitech K400 wireless keboard/trackpad and an Edimax Nano USB WiFi. I had a lot of trouble getting it to work, but used @MrEngman's script at http://www.raspberrypi.org/phpBB3/viewtopic.php?f=26&t=6256 . It took a few attempts. I had to let the script ru...
by Clifford
Sun May 27, 2012 6:40 pm
Forum: Troubleshooting
Topic: Netwok errors in LXDE with USB 1.0 hub
Replies: 6
Views: 1941

Re: Netwok errors in LXDE with USB 1.0 hub

Thanks @jbeale. Sounds plausible; the power supply is underrated at 580mA - my purchasing error! I loaned my multimeter sometime ago and have not seen it since. I was hoping that using a powered USB hub would not impose an added load - in fact I assumed it would reduce the load by not having both th...
by Clifford
Sun May 27, 2012 10:41 am
Forum: Troubleshooting
Topic: Netwok errors in LXDE with USB 1.0 hub
Replies: 6
Views: 1941

Netwok errors in LXDE with USB 1.0 hub

I have a problem with very slow network access under very particular but seemingly unrelated conditions. Using Debian "Squeze" (debian6-19-04-2012): When running LXDE with keyboard and mouse connected via a self-powered USB 1.0 hub, network access is slow. If I ping my router ping times are all over...
by Clifford
Sat May 05, 2012 10:43 am
Forum: Python
Topic: Which Python 2.7 or 3.x?
Replies: 19
Views: 9905

Re: Which Python 2.7 or 3.x?

<r>croston said: <br/> <br/> <br/> <URL url="http://inventwithpython.com/">http://inventwithpython.com/</URL> is aimed at youngsters, uses Python 3 and looks quite good.<br/> <br/> Bear in mind that the difference between Python 2 and Python 3 is minimal.<br/> <br/> <br/> <br/> OK, I took a look and...
by Clifford
Sat May 05, 2012 9:35 am
Forum: Python
Topic: Which Python 2.7 or 3.x?
Replies: 19
Views: 9905

Re: Which Python 2.7 or 3.x?

rurwin said:


Put this as the first line of your program,[...]


Just the sort of arcane "magic incantation" one would want to avoid when teaching kids.  Which was kind of my point - stability and consistency are key.

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