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by hamster
Fri Dec 13, 2013 8:30 am
Forum: General discussion
Topic: LOGI-Pi kickstarter funded...
Replies: 0
Views: 396

LOGI-Pi kickstarter funded...

I just saw that ValentFX's Logi-Pi FPGA expansion card for the Raspberry Pi made its Kickstarter funding goal after only 2 days. I've had a prototype for a few months and found it to be an excellent add-on - having the equivalent of half a million logic gates hanging off the Pi's expansion connector...
by hamster
Sun Dec 01, 2013 8:05 am
Forum: Advanced users
Topic: Automatically extract specific files usb drive
Replies: 2
Views: 1381

Re: Automatically extract specific files usb drive

Hi! Something like this does what you asked for: mnt /dev/sda /mnt find /mnt -name '*.ext' -type f -exec cp {} /destination_dir umount /mnt/sda It does however dump the files into the one directory. If you want to to preserve the directory tree structure under the destination directory then you mayb...
by hamster
Sun Dec 01, 2013 7:47 am
Forum: Advanced users
Topic: low-cost ten degrees of freedom sensor board
Replies: 0
Views: 504

low-cost ten degrees of freedom sensor board

Hi, I've been playing around wiring my Pi to a low cost I2C module which has the following sensors: Accelerometer (x,y,z, although z is a bit flaky) Compass (x,y,z) Gyro (x,y,z) Air Pressure / altitude Temperature You can find the 'C' source on http://hamsterworks.co.nz/mediawiki/index.php/Ten_Degre...
by hamster
Sat Dec 24, 2011 7:30 am
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3538
Views: 112693

Re: Introduce yourself!

<t>Quote from EtheB on December 24, 2011, 07:10<br/> Hi, I'm Eric and live in Rangiora, New Zealand<br/> ...<br/> It will be my first (real) immersion in all things Unix - can't wait.<br/> <br/> Hi Eric, I'm 'just' 40km down the road in Springston ( jsut outside of Lincoln).<br/> Maybe we should org...
by hamster
Sun Dec 11, 2011 12:32 am
Forum: Staffroom, classroom and projects
Topic: Best first language
Replies: 160
Views: 43111

Re: Best first language

<r>Quote from aho on December 10, 2011, 15:37<br/> I even think that BASIC is fine, because it can show you how bad GOTO actually is.<br/> <br/> Hey! I like gotos in C! <E>:-)</E><br/> <br/> Using them is many times better than nested if/else blocks for dealing to exceptions. The main flow of code s...
by hamster
Fri Dec 09, 2011 2:54 am
Forum: Staffroom, classroom and projects
Topic: Best first language
Replies: 160
Views: 43111

Re: Best first language

<t>Quote from nullstring on December 9, 2011, 01:36<br/> My personal opinion:<br/> <br/> First programming language as a hobby- php<br/> <br/> ...<br/> But it's really sort of terrible, so, it's a bad language for a course.<br/> <br/> <br/> I like PHP - it's sort of the "rocky horror" of languages.....
by hamster
Fri Dec 02, 2011 4:15 am
Forum: Staffroom, classroom and projects
Topic: Best first language
Replies: 160
Views: 43111

Re: Best first language

<r>I know that this is not really the place to use the 'A' word, but I'm sure that a lot of you have tried small embedded development projects with Arduino. (For those who haven't it is just a nice GUI wrapper around gcc and a few libraries it is very,very swish and very usable).<br/> <br/> It makes...
by hamster
Sat Nov 26, 2011 3:39 am
Forum: General discussion
Topic: on board (the rpi) software tools.
Replies: 44
Views: 5973

Re: on board (the rpi) software tools.

<t>Regarding integer division and the lack of a divide instruction on most ARM CPUs.<br/> <br/> While my son has been snoozing beside me I've played around with unsigned 16 bit radix-4 division and comparing that to the native AMD CPU division. Turns out that it is only 27 or so cycles slower per di...
by hamster
Fri Nov 25, 2011 9:44 pm
Forum: General discussion
Topic: on board (the rpi) software tools.
Replies: 44
Views: 5973

Re: on board (the rpi) software tools.

You might find some inspiration. For fast integer division in http://www.hackersdelight.org/.....vcMore.pdf
by hamster
Fri Nov 25, 2011 1:43 am
Forum: General discussion
Topic: on board (the rpi) software tools.
Replies: 44
Views: 5973

Re: on board (the rpi) software tools.

<t>I'm having and idle day, so this is more chit-chat that anything of substance.<br/> <br/> The ARM Cortex-M3 processor does have hardware divide (2-12 Cycles)...<br/> <br/> Thumb/Thumb2 ISA seems to me to be something on the way to the instruction decode/translate units used on AMD CPUs to decompo...
by hamster
Thu Nov 24, 2011 11:47 pm
Forum: General discussion
Topic: on board (the rpi) software tools.
Replies: 44
Views: 5973

Re: on board (the rpi) software tools.

<t>@NimbyDagda Humm,,, I could be swayed, but I don't that that that is valid statement.<br/> <br/> Divide instructions always take more than one memory cycle (some are > 50 cycles), and some basic atomic operations will require multiple memory cycles (e.g. atomic test and set operations).<br/> <br/...
by hamster
Wed Nov 23, 2011 3:59 am
Forum: Staffroom, classroom and projects
Topic: Project Euler
Replies: 3
Views: 1513

Re: Project Euler

<r><URL url="http://projecteuler.net/">http://projecteuler.net/</URL> - not so much as an application as a resource.<br/> <br/> It has some really pithy math problems that can be either simple to solve or absolutely mind-screwingly hard.<br/> <br/> All can be solved by a well designed program in a f...
by hamster
Tue Nov 22, 2011 8:05 pm
Forum: Staffroom, classroom and projects
Topic: Best first language
Replies: 160
Views: 43111

Re: Best first language

<r>I disagree. If you don't understand about memory allocation AND deallocation, and just assume the language does it for you, you are in for a very nasty shock when you need to start doing it<br/> <br/> Real programmers don't use malloc() and free(), just sbrk(), <E>:-)</E><br/> <br/> I think dynam...
by hamster
Tue Nov 22, 2011 9:32 am
Forum: Gaming
Topic: Self-Contained MAME Machine
Replies: 80
Views: 37946

Re: Self-Contained MAME Machine

Given that MAME/XMAME whatever is largely around emulation of 8 bit CPUs running in the low single digit MHz range, I can't see why it wouldn't work... but personally I like my arcade games from http://fpgaarcade.com - true retro!
by hamster
Tue Nov 22, 2011 7:30 am
Forum: Staffroom, classroom and projects
Topic: Best first language
Replies: 160
Views: 43111

Re: Best first language

<r>I don't really think that speed of execution matters - after all, PHP seems to be ruling the web <E>:-)</E>.<br/> <br/> A beginner is going to write slow code even before they start using any large quantity of data. Remember things like simple bubble sorts, searching arrays without hashing, acces...
by hamster
Tue Nov 08, 2011 8:15 am
Forum: General discussion
Topic: An example of where this project may help Education in the Pacific
Replies: 5
Views: 1417

Re: An example of where this project may help Education in the Pacific

<r>That circuit is nice and easy, but I would be tempted to use something like <URL url="http://www.dealextreme.com/p/100w-car-dc-12v-to-ac-220v-power-inverter-with-usb-port-91344"><LINK_TEXT text="http://www.dealextreme.com/p/100w-car-d ... port-91344">http://www.dealextreme.com/p/100w-car-dc-12v-t...
by hamster
Mon Nov 07, 2011 11:24 pm
Forum: General discussion
Topic: Will the Raspberry Pi use any non-free software?
Replies: 27
Views: 6871

Re: Will the Raspberry Pi use any non-free software?

It is also pretty safe to assume that there is also a minimal boot loader embedded in the GPU itself - it would have to be a pretty complex state machine to load a BLOB off of a FAT32 partition of the SD card...
by hamster
Mon Nov 07, 2011 3:40 am
Forum: General discussion
Topic: An example of where this project may help Education in the Pacific
Replies: 5
Views: 1417

Re: An example of where this project may help Education in the Pacific

<r>Have a read of this article:<br/> <br/> <URL url="http://pacific.scoop.co.nz/2011/11/your-it-trash-could-be-someone%E2%80%99s-treasure/"><LINK_TEXT text="http://pacific.scoop.co.nz/2011/11/your ... -treasure/">http://pacific.scoop.co.nz/2011/11/your-it-trash-could-be-someone%E2%80%99s-treasure/</...
by hamster
Thu Nov 03, 2011 9:44 am
Forum: General discussion
Topic: Should I be able to boot off a 16GB SDHC?
Replies: 20
Views: 3276

Re: Should I be able to boot off a 16GB SDHC?

<t>Quick question.. at the moment what class SDHC card do you recommend using?<br/> <br/> I ask because a local bulk retailer has Lexar Class 4 SDHC cards going for USD$15 (which is less than I can get them a wholesaler). Should I snaffle me a few?<br/> <br/> I know you can't guarantee anything, but...
by hamster
Thu Nov 03, 2011 12:10 am
Forum: General discussion
Topic: Using the board for commercial projects.
Replies: 24
Views: 5418

Re: Using the board for commercial projects.

<r>[quote]<B><s>[b]</s>Quote from Bacan on November 2, 2011, 23:18<e>[/b]</e></B><br/> <br/> It is a matter of your using someone else\'s <I><s>[i]</s>Good Will<e>[/i]</e></I> and <I><s>[i]</s>Brand<e>[/i]</e></I> with out an agreement, esp. when it is promoting <I><s>[i]</s>Your<e>[/i]</e></I> prod...
by hamster
Wed Nov 02, 2011 7:14 am
Forum: General discussion
Topic: Using the board for commercial projects.
Replies: 24
Views: 5418

Re: Using the board for commercial projects.

<t>I can instantly where RaspPi could be the basis of an excellent commercial product - a simple, low power RDP client. That is what I will use my second one for...<br/> <br/> The HP solution costs anything up to 10x the price of a RaspPi, so with a little bit of glue to provide remote configuration...
by hamster
Mon Oct 31, 2011 4:16 am
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3538
Views: 112693

Re: Introduce yourself!

<t>Hi, I'm Mike Field, aka "Hamster" at most of my on-line haunts.<br/> <br/> Like most people here I grew up during the 8bit era and am insanely curious about computing. ZX81, Spectrum, VIC20, C64...<br/> <br/> I'm also a long time Linux user, installing from floppy images that arrived on Infomagic...
by hamster
Mon Oct 31, 2011 3:53 am
Forum: Staffroom, classroom and projects
Topic: Special Education teacher here!
Replies: 8
Views: 2465

Re: Special Education teacher here!

<t>As a parent of a very seriously disabled special needs child, I hate to admit it but the iPad is very, very good as a communication aid. You just know that everything will work - the screen resolution is consistent, the user interface is consistent and so on, unlike what you get with Android devi...

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