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by johnbeetem
Mon Oct 31, 2011 5:08 am
Forum: Staffroom, classroom and projects
Topic: Fond memories
Replies: 42
Views: 9760

Re: Fond memories

<t>Earliest experience (early USA high school) was on a DEC LINC-8, a version of the PDP-8. Main programming language was FOCAL (FOrmula CALculator), a DEC language somewhere between FORTRAN and BASIC. All communication was via 10 CPS teletype. Later I used a real PDP-8, and even tried to do some as...
by johnbeetem
Sun Oct 30, 2011 6:36 pm
Forum: Off topic discussion
Topic: 64-bit ARM architecture: ARMv8
Replies: 4
Views: 4443

Re: 64-bit ARM architecture: ARMv8

<t>FYI the 32-bit ARM Cortex-A15 and recently-announced ARM Cortex-A7 have 40 bit physical addresses. The operating system can use the 40-bit physical address to manage up to 256 32-bit virtual address application programs in physical memory. IMO 32 bits is plenty for sensible application and will b...
by johnbeetem
Fri Oct 28, 2011 9:40 pm
Forum: General discussion
Topic: News articles and blog posts about Raspberry Pi
Replies: 1021
Views: 195506

Re: News articles and blog posts about Raspberry Pi

<r><URL url="http://www.eetimes.com/electro.....ith-awards">http://www.eetimes.com/electro.....ith-awards</URL><br/> ARM TechCon celebrates excellence with awards<br/> ...<br/> ARM TechCon is all about education and the The ARM TechCon Best in Show Award Winner for Hardware epitomizes this as it is ...
by johnbeetem
Fri Oct 28, 2011 9:09 pm
Forum: Off topic discussion
Topic: Merchandise ideas
Replies: 116
Views: 17315

Re: Merchandise ideas

<t>I have an authentic English deerstalker hat. I keep it handy for when I have a particularly difficult debugging problem that requires a lot of detective work. Putting it on helps me channel Sherlock Holmes.<br/> <br/> I also have a pith helmet in case the task involves exploring, which is often t...
by johnbeetem
Fri Oct 28, 2011 6:59 pm
Forum: General programming discussion
Topic: Lets get a beginner programing thread in here!
Replies: 56
Views: 11643

Re: Lets get a beginner programing thread in here!

<t>Quote from clivebeale on October 28, 2011, 12:37<br/> The ultimate aim is not to make an army of programmers but to teach all children computational thinking from an early stage, making them better learners in all subjects (and in life if we are getting philosophical) and give them the skills and...
by johnbeetem
Thu Oct 27, 2011 11:18 pm
Forum: Off topic discussion
Topic: 64-bit ARM architecture: ARMv8
Replies: 4
Views: 4443

Re: 64-bit ARM architecture: ARMv8

<r>Today at the ARM TechCon in SillyIcon Valley, ARM announced its upcoming 64-bit architecture:<br/> <br/> <URL url="http://www.arm.com/about/newsr.....ecture.php">http://www.arm.com/about/newsr.....ecture.php</URL><br/> <br/> ARMv8 runs in either the 32-bit AArch32 state or 64-bit AArch64 state. T...
by johnbeetem
Thu Oct 27, 2011 10:58 pm
Forum: General programming discussion
Topic: Lets get a beginner programing thread in here!
Replies: 56
Views: 11643

Re: Lets get a beginner programing thread in here!

<t>Ah yes, APL. You could write a prime number generator in just 18 characters IIRC. (Gack, I did remember correctly. It's in the Wiki article.) The generator was horribly inefficient and nearly impossible to decypher. APL was known as a "write only" language.<br/> <br/> A cartoon of the time had tw...
by johnbeetem
Thu Oct 27, 2011 7:43 pm
Forum: General discussion
Topic: Best Hardware Product in Show award!
Replies: 24
Views: 2786

Re: Best Hardware Product in Show award!

<t>Congratulations! Well done beating out the Rubik\'s Cube solver and the über-geek Android wrist-watch from Si14. Even though Eben clearly said \"come look at the toy\", it was clear that RasPi is far more than a toy and has amazing potential.<br/> <br/> < pet peeve > If Xilinx, MicroSemi (formerl...
by johnbeetem
Thu Oct 27, 2011 2:45 am
Forum: Off topic discussion
Topic: Anyone going to ARM TechCon Oct 25-27 2011 in California
Replies: 13
Views: 1955

Re: Anyone going to ARM TechCon Oct 25-27 2011 in California

<t>Yay! I made it to the ARM TechCon today and saw a prototype Raspberry Pi in action. Fantastic graphics. Eben is just as nice as Liz keeps telling us. I got to the booth before the crowds and was able to talk to Eben alone before it got crowded. The last time I walked by the booth there were quite...
by johnbeetem
Thu Oct 27, 2011 2:37 am
Forum: General discussion
Topic: Consider throwing out the "Model A" / "Model B" naming convention.
Replies: 22
Views: 2346

Re: Consider throwing out the "Model A" / "Model B" naming convention.

<t>Many products use the same PC board with different part stuffing options and have completely different names for the resulting products. In fact, sometimes you put the same board in different chassis and call the products different things. Or you sell the board to OEMs who then create all sorts o...
by johnbeetem
Wed Oct 26, 2011 12:51 am
Forum: General discussion
Topic: Power supply news!
Replies: 176
Views: 20541

Re: Power supply news!

<t>liamfraser280: Here\'s a typical calculation for driving an LED through a resistor. Let\'s say you have a 3.3V supply and you\'re driving the LED with an active-low driver, e.g., a microcontroller output pin. Let\'s say you want 10 mA through the LED so it\'s nice and bright. The circuit looks so...
by johnbeetem
Tue Oct 25, 2011 9:09 pm
Forum: General discussion
Topic: Power supply news!
Replies: 176
Views: 20541

Re: Power supply news!

<t>liamfraser280: I do something similar to your circuit for my BeagleBoard. In my case I have a +5V regulated supply based on a Linear Technology LT1767 demo board I had in my parts bin. I just hook up two cables, one to the BeagleBoard power jack and one to my USB hub. Many non-powered USB hubs ac...
by johnbeetem
Tue Oct 25, 2011 8:13 pm
Forum: Off topic discussion
Topic: John McCarthy, RIP.
Replies: 6
Views: 1461

Re: John McCarthy, RIP.

<t>Well, I for one learned LISP before Emacs was released. The beauty and elegance of LISP is that it requires only a few primitive operations -- everything else can be built from those primitives. Given that LISP was first implemented on an IBM 704, the idea that it's somehow a resource hog is pret...
by johnbeetem
Tue Oct 25, 2011 2:25 pm
Forum: General discussion
Topic: News articles and blog posts about Raspberry Pi
Replies: 1021
Views: 195506

Re: News articles and blog posts about Raspberry Pi

<r>From Linux Devices:<br/> http://www.linuxfordevices.com.....hCon-2011/<br/> <br/> ARM will detail Cortex-A7 at this week's TechCon<br/> ARM is set to provide an in-depth look at its recently announced Cortex-A7 processor this week at a Santa Clara, California-based event. Other highlights of ARM ...
by johnbeetem
Sun Oct 23, 2011 12:50 am
Forum: General discussion
Topic: New blog post
Replies: 4
Views: 964

Re: New blog post

<t>I miss LSTTL. Such nice smooth transitions. Never had to worry about ground bounce or termination. Didn\'t have to worry about static discharge either.<br/> <br/> I remember when I came to the rescue for a work project that had 5V HCT buffers. A connector had way too many data signals for the num...
by johnbeetem
Fri Oct 21, 2011 7:33 pm
Forum: General discussion
Topic: News articles and blog posts about Raspberry Pi
Replies: 1021
Views: 195506

Re: News articles and blog posts about Raspberry Pi

<r><URL url="http://www.eetimes.com/electro.....er-on-show">http://www.eetimes.com/electro.....er-on-show</URL><br/> <br/> From Geek Times: A slice of Pi - the $25 computer on show<br/> <br/> A computer board that contains everything you might need, and is to be priced around $25, will come under th...
by johnbeetem
Fri Oct 21, 2011 2:42 am
Forum: Off topic discussion
Topic: RasPi vs Arduino vs Tablets
Replies: 9
Views: 3773

Re: RasPi vs Arduino vs Tablets

A nice thing about Nook Color is that it has an accessible microSD card, so you can swap the original Nook software with an Android image without rooting (according to Wikipedia). I don't know if this is the case with Ubuntu.
by johnbeetem
Fri Oct 21, 2011 12:20 am
Forum: Off topic discussion
Topic: RasPi vs Arduino vs Tablets
Replies: 9
Views: 3773

Re: RasPi vs Arduino vs Tablets

<t>obarthelemy: I did a little searching on the Internet and it seems people have hacked the B&N Nook Color to run GNU/Linux (e.g., Ubuntu) as well as getting it run Android. And it seems the Nook Color USB can do host (I would guess it's an OTG port).<br/> <br/> This gets you to US$250. However...
by johnbeetem
Thu Oct 20, 2011 11:23 pm
Forum: Off topic discussion
Topic: RasPi vs Arduino vs Tablets
Replies: 9
Views: 3773

Re: RasPi vs Arduino vs Tablets

<t>obarthelemy: You might check out Always Innovating's Touch Book. At $300 It's not cheap-cheap, but it does run various GNU/Linux as well as Android. It was originally based on the BeagleBoard; they may have since gone with their own circuit board. I've never used a Touch Book myself, though I did...
by johnbeetem
Tue Oct 18, 2011 1:03 am
Forum: Off topic discussion
Topic: Anyone going to ARM TechCon Oct 25-27 2011 in California
Replies: 13
Views: 1955

Re: Anyone going to ARM TechCon Oct 25-27 2011 in California

<t>Liz,<br/> Is Eben speaking at ARM TechCon? I'm planning to be there Wednesday with an exhibits pass. I live in Berkeley so I just come down for the day. It's fascinating to see how quickly ARM has progressed since I started going to the ARM conference in 2006. OTOH, I'm quite annoyed that it's st...

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