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by Tomo2k
Tue Jan 10, 2012 5:20 am
Forum: Other projects
Topic: DMX controller for LED architectural lighting
Replies: 25
Views: 17566

Re: DMX controller for LED architectural lighting

<t>Don't use ArtNet, it is a truly evil protocol that simply does not scale.<br/> It is slowly following 0-10V into the history books (and legacy compatibility).<br/> <br/> - Also, no sane network admin will allow ArtNet on their network. It doesn't play nice with other users.<br/> <br/> ANSI E1.31 ...
by Tomo2k
Tue Jan 10, 2012 5:00 am
Forum: General discussion
Topic: Mounting holes on R-Pi?
Replies: 34
Views: 8308

Re: Mounting holes on R-Pi?

<t>Sorry, 6 and 12 was meant to be an example and isn't based on the RPi PCB size. I obviously edited that bit out while re-writing for clarity. Oops.<br/> <br/> - Can't do the real maths as I don't know the sheet size or panelisation technique used, and I don't need to know either.<br/> <br/> Regar...
by Tomo2k
Tue Jan 10, 2012 1:29 am
Forum: General discussion
Topic: Mounting holes on R-Pi?
Replies: 34
Views: 8308

Re: Mounting holes on R-Pi?

<t>liz said: <br/> <br/> <br/> It"s also the case that silicon is expensive stuff. If we keep the area down, we save money. And thats of paramount importance here. Small is a big win for us because as well as being cute and surprising, it"s also cheap.<br/> <br/> <br/> I think you meant FR4 rather t...
by Tomo2k
Mon Jan 09, 2012 4:53 pm
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 111207

Re: Gertboard

<t>Gert said: <br/> <br/> <br/> <br/> (Some of the tracks on the PCB look a bit random – are there really several that are completely unconnected or am I just being thick or blind?)<br/> <br/> <br/> You are probably seeing the copper fill tracks. I put some copper 'stripes' down in areas which have ...
by Tomo2k
Mon Jan 09, 2012 4:31 pm
Forum: General discussion
Topic: The secret of (lost) computer interest
Replies: 17
Views: 4651

Re: The secret of (lost) computer interest

<t>Burngate said: <br/> <br/> <br/> For me the big difference between then and now is that today, we have a machine which does lots of valuable things.<br/> <br/> <br/> I think this is the real reason.<br/> <br/> Back in the 8-bit days everything important was either in ROM or on a separate disk/tap...
by Tomo2k
Mon Jan 09, 2012 4:11 pm
Forum: General discussion
Topic: No OS news?
Replies: 87
Views: 24293

Re: No OS news?

<t>kme said: <br/> <br/> The proper requirement would be "kernel x.y-series, shell a, DE b, compiler for language m being q".<br/> <br/> You are right, of course.<br/> <br/> However, Distro X version Y is a simple "package" of default ones of these, and as a "starting" requirement it is easier to wr...
by Tomo2k
Mon Jan 09, 2012 2:06 am
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 111207

Re: Gertboard

<t>Excellent!<br/> <br/> (Some of the tracks on the PCB look a bit random – are there really several that are completely unconnected or am I just being thick or blind?)<br/> <br/> Very good idea to switch out the buffers for ADC/DACs instead, that is much more useful.<br/> <br/> Is the PIC wired up ...
by Tomo2k
Mon Jan 09, 2012 1:49 am
Forum: General discussion
Topic: No OS news?
Replies: 87
Views: 24293

Re: No OS news?

<t>Benedict White said: <br/> <br/> <br/> zag said: <br/> <br/> <br/> From an educational point of view we absolutely want to see a "default" operating system.<br/> <br/> I'm currently designing some lesson plans on learning Linux on the RPI and will need to know that others are using the same Distr...
by Tomo2k
Mon Jan 09, 2012 1:27 am
Forum: General discussion
Topic: Power supply WARNING
Replies: 73
Views: 37962

Re: Power supply WARNING

<t>Erm, no.<br/> <br/> Jessie, you haven"t understood.<br/> <br/> This device is supposed to be a regulated power supply. Ohms law does not apply.<br/> (Or rather, it should not.)<br/> <br/> He is asking the supply to provide a chosen current between 0mA and 1000mA (the nameplate ratings) using a va...
by Tomo2k
Sat Jan 07, 2012 10:14 pm
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 77411

Re: PiCard - GUI SD Preparation Tool

<t>Liam Fraser said: <br/> <br/> The actual java app will not run as administrator... but it's child processes will display a UAC prompt. It's a bit messy but it works. Let's be honest - the nature of the task was never going to allow a pretty perfect solution.<br/> Well, that's the way it should be...
by Tomo2k
Sat Jan 07, 2012 10:06 pm
Forum: General discussion
Topic: Raspberry Pi #1 spotting...
Replies: 53
Views: 11462

Re: Raspberry Pi #1 spotting...

2 minutes....

Still no bids over the £1900 - where are the snipers?
by Tomo2k
Sat Jan 07, 2012 9:40 pm
Forum: General discussion
Topic: What DOS games can it run?
Replies: 39
Views: 12544

Re: What DOS games can it run?

<t>DOSBox is a full CPU emulation system – it works fine on PowerPC.<br/> <br/> So it should be possible to compile for ARM, so I would say yes, you can probably run old DOS games.<br/> <br/> The key requirement is SDL, which can be compiled for ARM. Don't know if a binary is available, but that doe...
by Tomo2k
Sat Jan 07, 2012 7:41 pm
Forum: General discussion
Topic: Latency for realtime USB audio (and GPIO) processing, what is possible? GPU blob=CPU hog?
Replies: 12
Views: 4946

Re: Latency for realtime USB audio (and GPIO) processing, what is possible? GPU blob=CPU hog?

<t>None of these benchmarks exist at present, and chances are nobody will bother unless it directly affects some project they are doing.<br/> <br/> Remember that this hardware has not been released yet.<br/> <br/> USB 2.0 fundamentally costs about 2ms round-trip regardless of host capabilities, and ...
by Tomo2k
Sat Jan 07, 2012 6:42 pm
Forum: General discussion
Topic: Latency for realtime USB audio (and GPIO) processing, what is possible? GPU blob=CPU hog?
Replies: 12
Views: 4946

Re: Latency for realtime USB audio (and GPIO) processing, what is possible? GPU blob=CPU hog?

<t>Your understanding is based on an incorrect premise.<br/> <br/> This is not a PC, and does not work the same way.<br/> - A GPU fundamentally IS a processor anyway. What else could it be?<br/> <br/> The GPU has very little ROM. The GPU binary blob IS the GPU firmware.<br/> <br/> The VideoCore IV i...
by Tomo2k
Sat Jan 07, 2012 5:05 pm
Forum: General discussion
Topic: Latency for realtime USB audio (and GPIO) processing, what is possible? GPU blob=CPU hog?
Replies: 12
Views: 4946

Re: Latency for realtime USB audio (and GPIO) processing, what is possible? GPU blob=CPU hog?

The GPU blob is the firmware that runs on the GPU itself. It is the equivalent of the VideoBIOS on your graphics card.

The ARM only talks to it, it doesn't run it.
by Tomo2k
Fri Jan 06, 2012 11:41 pm
Forum: Off topic discussion
Topic: Linking a Pi to the Physical world
Replies: 12
Views: 3580

Re: Linking a Pi to the Physical world

<t>An FPGA daughterboard would be easy enough for someone to create, if you would like it.<br/> <br/> This is the kind of thing the GPIO is for, and also means that there could be versions with different sizes of FPGAs - eg the same amount of I/O but more logic blocks would likely be doable with the...
by Tomo2k
Fri Jan 06, 2012 9:39 pm
Forum: Other projects
Topic: Use LowDef CRT-TV as Output?
Replies: 6
Views: 2183

Re: Use LowDef CRT-TV as Output?

<t>The RPi has the composite output, so I'd use that.<br/> <br/> I also think you've confused a few different standards, as S-Video is neither HD nor "Component". It's just got a bit less crosstalk between colour and luma.<br/> <br/> Composite video: Standard Definition.<br/> One coax, usually on a ...
by Tomo2k
Fri Jan 06, 2012 9:23 pm
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 77411

Re: PiCard - GUI SD Preparation Tool

<t>Excellent work!<br/> <br/> Some "safety" that I think would be useful:<br/> <br/> 1) When listing the devices, if the target already has any filesystem recognised by the host computer, it would be great if it could show the partition label(s) of the devices as well.<br/> - This will make it easie...
by Tomo2k
Fri Jan 06, 2012 6:52 pm
Forum: Other projects
Topic: DMX controller for LED architectural lighting
Replies: 25
Views: 17566

Re: DMX controller for LED architectural lighting

<t>MagicQ source code will not be available, as that is their key intellectual property that their entire business is built on.<br/> <br/> However, Chamsys are very nice guys, and it's definitely worth asking them if they would consider an Armv6 port for the Raspberry Pi.<br/> <br/> I suspect the RP...
by Tomo2k
Fri Jan 06, 2012 6:30 pm
Forum: General discussion
Topic: Final Price
Replies: 8
Views: 2110

Re: Final Price

The price is in USD because almost all bulk electronic components are priced in USD.

Thus using USD protects the Foundation from exchange rate fluctuations.
by Tomo2k
Thu Jan 05, 2012 9:27 pm
Forum: General discussion
Topic: On-board clock?
Replies: 1
Views: 1042

Re: On-board clock?

SPI and I2C both include clocks, and with the right data stream a UART becomes a clock as well.

All three of those are on the GPIO.

I don't think the supported frequencies for them all have been published yet, though SPI will be much faster than I2C.
by Tomo2k
Thu Jan 05, 2012 9:13 pm
Forum: General discussion
Topic: Flash player ?
Replies: 4
Views: 1833

Re: Flash player ?

YouTube is slowly porting over to HTML5, which will work.

- Won't be too long before it doesn't use Flash at all.
by Tomo2k
Thu Jan 05, 2012 6:55 pm
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 111207

Re: Gertboard

<t>The post on the front page was the "first prototype", and Gert did say at the time that there were several errata that would need fixing before a production run could be considered.<br/> <br/> The "cheap turnaround" from the place I order prototype PCBs from takes anywhere between 3 and 6 weeks t...
by Tomo2k
Thu Jan 05, 2012 6:25 pm
Forum: General discussion
Topic: Easy GPIO Hardware & Software
Replies: 133
Views: 52020

Re: Easy GPIO Hardware & Software

<t>meltwater said: <br/> <br/> 2. Small DC motor drive<br/> MOSFET or Darlington Pair to provide high power drive and reverse bias diode to protect from motor coils. (Input voltage may also need to be higher of course depending on the motor).<br/> <br/> <br/> <br/> The motor drive would need to have...
by Tomo2k
Thu Jan 05, 2012 6:12 pm
Forum: General discussion
Topic: BCM2835 Questions
Replies: 31
Views: 11076

Re: BCM2835 Questions

<t>Presence, you will need to contact Broadcom directly about pricing, prototypes, pinout and the other information you would need to design and build a device based on the BCM2835.<br/> <br/> This is exactly the same as for any embedded CPU, or even microcontroller.<br/> - Even for the PIC you need...

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