Why does the Raspberry Pi exist? - Page 8

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Re: Why does the Raspberry Pi exist?
On Fri, 21 Jun 2013 12:13:50 +0100

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I use one of these  http://www.ebay.co.uk/itm/190765672993 it's really
handy for temporarily attaching an optical drive, retrieving data from
dead laptops etc.  Wouldn't be the fastest storage solution though.


Re: Why does the Raspberry Pi exist?

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I think so. A USB<->IDE (meaning PATA, for those familiar with a
different meaning of the acronym) adaptor with a PATA-SATA adaptor
plugged into it ought to do the trick.

Have the PATA-SATA adaptor but haven't yet got a SATA drive to try this
out, however I can access a PATA DVD drive from a FitPC this way so I
don't see why it shouldn't work with an RPi.

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Re: Why does the Raspberry Pi exist?
On Sat, 22 Jun 2013 22:04:31 GMT
snipped-for-privacy@Onetel.net.uk.invalid (Windmill) wrote:

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Why bother when you can get a cheap USB-SATA adaptor?


Re: Why does the Raspberry Pi exist?
Rob Morley wrote:
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Or the one I bought a while ago, which does USB to SATA, and both  
varieties of PATA. It won't cope with very old non-IDE hard drives,  
though....

--  
Tciao for Now!

John.

Re: Why does the Raspberry Pi exist?

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'Cos you may have PATA devices bought several years ago, DVD drives for
example. (Though I've an idea that some/most PATA<->SATA adpators are
bidirectional so could be used with a USB-SATA adaptor to connect a
PATA drive).

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Re: Why does the Raspberry Pi exist?
On 25/06/13 04:05, Windmill wrote:
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So you get a cheap USB<->3.5"IDE/2.5"IDE/SATA adaptor. They work well.

Re: Why does the Raspberry Pi exist?
On Tue, 25 Jun 2013 03:05:09 GMT
snipped-for-privacy@Onetel.net.uk.invalid (Windmill) wrote:

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I do - and my cheap USB-SATA adapter also does 2.5" & 3.5" PATA.  But
the OP was only asking about SATA.


Re: Why does the Raspberry Pi exist?
wrote:

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it was probably and earlier version of GNU/Linux which was designed
for lower memory computers.

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It's the official RPi OS (debian).
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Re: Why does the Raspberry Pi exist?
On Thu, 20 Jun 2013 08:53:59 +0100

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Congratulations on your incisive reasoning powers.  It was Slackware
three-point-something, which was contemporary with the hardware
described above.  These days you need to be selective in what you run
on low power machines, the default desktop environment and software
choices in most distros are going to be much too heavy.  I usually
start with a minimal Debian installation (and possibly a custom
kernel) rather than going to one of the specialist distros like Puppy,
which can be somewhat idiosyncratic.
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Well yes, I believe I already pointed that out somewhere upthread, but
the subject at hand was choice of software to run, rather than the base
OS/repo.


Re: Why does the Raspberry Pi exist?
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Linux does not use that much ram, from the raspbian I installed 50
days ago (uptime is 48 days now)

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There is 64 mb used by the graphics engine, as per my config, and
the Linux kernel uses 26MB before freeing up space.  

The X server uses 37 MB, the variuos LXDE processes about 45 MB, and then
come the applications, which then have 448-26-45-3734%0 MB, which is  
quite enough for a browser and an IDE. And, yes, that can be tight if
you start with 256MB less.  

ARM code is a bit tighter than x86, the code segments in /bin are
generally 8-17% smaller. Not all that much, but it contributes.  

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The 256MB version should have around 85M between them, something which
would run intense paging once you start more than a few shells.

The 900Mhz (overclocked) 512M runs a browser; chromium is the one
that has the best "feel", but you can only have 5-6 windows open
before it hits paging. It is also essential to have a _fast_ SD
card when it comes to modern desktop applications. Otherwise it
will die performance-wise once the applications starts doing I/O.

It can do around 25 mb/sec worth of I/O, restricted by the interrupt
load.  

Really not bad for a $50 piece of hardware.

And I wouldn't be ashamed to offer it to any developer of stock
*n*x code. They get to see another world from the wintel, if nothing
else.  

-- mrr

Re: Why does the Raspberry Pi exist?
On 20/06/13 19:49, Morten Reistad wrote:
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That may be why it never made it as an STB. a typical DBV MUX spits out  
50Mbps.

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Indeed.


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Re: Why does the Raspberry Pi exist?

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That does surprise me - seeing as ARM is RISC and x86 isn't - I'd have
thought the code density would be much better under x86, however a few
quick & dirty checks shows it's not:

/bin/ls        112518    x86
         94233    ARM

/bin/nano:    189176    x86
        157991    ARM

Both systems running Wheezy (Raspbian on the Pi) and outputs from 'size'.

Gordon

Re: Why does the Raspberry Pi exist?

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I used to think that developers should be forced to use 10 year old
computers as an incentive towards bloat-reduction!

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Re: Why does the Raspberry Pi exist?
On 21/06/13 11:03, Windmill wrote:
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and design their websites for access down a 56k modem too.

MY websites are...


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Ineptocracy

(in-ep-toc?-ra-cy) ? a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers.


Re: Why does the Raspberry Pi exist?

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Amen to that.

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I occasionally put up a simple web page or two, no bells nor
whistles, just plain text and hand-written HTML, with links to low res
pictures for some folks and (sometimes) identical but high res pictures for
those who can use that.
One second per page of text, maybe less if its compressible. Pictures
are of course much slower, if someone decides they're interested enough
to follow the link.
If there had been free WYSIWYG HTML tools when I first did this, I
might have been led astray, but without them it was DIY.

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Re: Why does the Raspberry Pi exist?
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It?s Debian wheezy rebuilt with an ABI suitable for the RPi.  The
relationship to Ubuntu is that Ubuntu is derived from Debian.  AFAIK
there?s no inherent reason you could?t do the same starting from Ubuntu
rather than from Debian.

--  
http://www.greenend.org.uk/rjk/

Re: Why does the Raspberry Pi exist?
Peter Percival wrote:
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Thank you for all replies.  I now see that they have their uses.  You do  
see that my question was designed to be provocative, don't you?  :-)  
But then again, I hope you'll agree that public money should not be  
spent on gadgets just because they're fashionable.

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Behind another Elephant
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Re: Why does the Raspberry Pi exist?
On 19/06/13 07:59, Peter Percival wrote:
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no one mentioned wind turbines..

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Ineptocracy

(in-ep-toc?-ra-cy) ? a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers.


Re: Why does the Raspberry Pi exist?
On 18/06/2013 15:01, Peter Percival wrote:
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I don't think anyone has actually answered the question you asked. They  
seem to have answered "why should the Raspberry Pi exist?"

The reason it exists is that its creator was getting fed up of the  
quality of comp sci graduates who had grown up so far removed from the  
hardware (as compared to the 8-bit days) that they lacked an  
understanding of the fundamentals. The Pi is an attempt to put that  
right by getting a simple device into the hands of kids that gets them  
back to the bare metal, hence the GPIO pins. I also think there's more  
to shipping without a case than the just the cost.

Re: Why does the Raspberry Pi exist?
Andrew Owen wrote:
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Ah, yes, that's a subtle point.  (Maybe not very subtle but I had missed  
it.)

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Which requires not just that the Raspberry Pi exists but also that it is  
got into schools.  Mention has been made of the preponderance of  
Microsoft stuff in ITC (ICT?  Whatever.).  So a change of syllabus is  
also needed.  Can schools change it, or is the intervention of cabinet  
ministers required?

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