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by rpdom
Wed Oct 09, 2013 10:11 am
Forum: General discussion
Topic: raspbian virtualisation
Replies: 12
Views: 3080

Re: raspbian virtualisation

I was running Qemu on Debian in text-mode only.
by rpdom
Wed Oct 09, 2013 9:29 am
Forum: General discussion
Topic: raspbian virtualisation
Replies: 12
Views: 3080

Re: raspbian virtualisation

I played a bit on Qemu and found it to be extremely slow - but I was using it on a Pentium 166MHz machine with 32MB of RAM ;)
To be honest, I was surprised it ran as fast as it did.
by rpdom
Wed Oct 09, 2013 9:22 am
Forum: Troubleshooting
Topic: Wrong memory size
Replies: 18
Views: 1989

Re: Wrong memory size

I cry now silently. I have the first board after the beta. Celebrate! You have a (sort of) limited edition Pi :-) I also have that type of Pi (as well as a pair of Model As) and it is in daily use as a media player (among other things). It has been very reliable and much fun. I've never had any rea...
by rpdom
Wed Oct 09, 2013 8:21 am
Forum: Troubleshooting
Topic: Wrong memory size
Replies: 18
Views: 1989

Re: Wrong memory size

Here it gows: Samsung 219 k4p2g324ed-agci gajo8090 Dont steal it pls. The important part of that is the "k4p2g324ed-agci", which is exactly the same as the memory chip on my 256MB model A Pi. Also you say your Pi doesn't have any "mounting" holes. That also indicates a Revision 1 model B. Just to c...
by rpdom
Wed Oct 09, 2013 6:39 am
Forum: Beginners
Topic: Could a phone line power a Pi?
Replies: 5
Views: 2037

Re: Could a phone line power a Pi?

Possibly, but I wouldn't recommend trying it. The phone line works on something around 50V AC, but all equipment connected should only take a tiny amount of current unless actually taking/making a call at the time. That tiny amount isn't enough to run a Pi, even after stepping down, smoothing and re...
by rpdom
Tue Oct 08, 2013 6:36 pm
Forum: Networking and servers
Topic: change ssh port
Replies: 7
Views: 95892

Re: change ssh port

You need to change /etc/ssh/sshd_config which is the config file for the ssh server, not /etc/ssh_config which is the client config. Then restart ssh.
by rpdom
Mon Oct 07, 2013 7:27 am
Forum: Troubleshooting
Topic: Wrong memory size
Replies: 18
Views: 1989

Re: Wrong memory size

Code: Select all

Revision        : 0002
That's definitely a Rev 1 board with 256MB. A Rev 2 with 512MB would show a Revision code of 000d or above.

You say you've had it nearly 2 years? The Pi was launched a little under 2 years ago, so that is one of the very early ones like my first Pi.
by rpdom
Sun Oct 06, 2013 6:48 pm
Forum: Raspbian
Topic: Help using cron ...
Replies: 3
Views: 705

Re: Help using cron ...

From "man 5 crontab" The crontab syntax does not make it possible to define all possible periods one could image off. For example, it is not straightforward to define the last weekday of a month. If a task needs to be run in a specific period of time that cannot be defined in the crontab syntaxs the...
by rpdom
Sun Oct 06, 2013 1:43 pm
Forum: General discussion
Topic: Can i release a modified version of raspberry pi
Replies: 37
Views: 5855

Re: Can i release a modified version of raspberry pi

klricks wrote:What else can be done to modify a RPi except for chopping off connectors or maybe changing out the 3V3 regulator to a switching type to save power?
I can think of a few things, but I'd be wary of turning this thread into yet another "Next Pi" thread.
by rpdom
Sun Oct 06, 2013 4:37 am
Forum: Beginners
Topic: "Can't Read Superblock", etc.
Replies: 6
Views: 2674

Re: "Can't Read Superblock", etc.

How do you start up again after a shutdown? The "proper" method is to pull the power and plug it back in again. However, there is another official way of doing it. If you briefly connect pin 5 of P1 to ground (pin 6 is handy for this), it will cause a restart. Do not leave pin 5 connected to ground...
by rpdom
Sat Oct 05, 2013 8:16 am
Forum: Beginners
Topic: sd card
Replies: 9
Views: 964

Re: sd card

Some built-in SD card slots in laptops don't seem to work properly. Try a cheap USB SDHC card reader (always useful to have a spare anyway).
by rpdom
Sat Oct 05, 2013 6:55 am
Forum: Beginners
Topic: Raspberry Pi + Windows RT
Replies: 5
Views: 2023

Re: Raspberry Pi + Windows RT

No
by rpdom
Thu Oct 03, 2013 7:35 am
Forum: Troubleshooting
Topic: Unable to install multiple packages
Replies: 6
Views: 2022

Re: Unable to install multiple packages

Those sources.list files all seem to be ok. I can't see any reference to http.debian.net in them. I wonder where that got picked up from?

I'm glad you managed to fix your DNS :)
by rpdom
Wed Oct 02, 2013 5:29 pm
Forum: Beginners
Topic: HDMI - RCA cable
Replies: 4
Views: 762

Re: HDMI - RCA cable

The first option is unlikely to work. To get an analogue VGA or RCA signal from the digital HDMI interface on the Pi requires an active converter unit and that appears to be a plain cable. The second two options would work with a standard RCA TV although picture quality will not be as good as it wou...
by rpdom
Wed Oct 02, 2013 6:40 am
Forum: Troubleshooting
Topic: Unable to install multiple packages
Replies: 6
Views: 2022

Re: Unable to install multiple packages

Err http://archive.raspberrypi.org wheezy Release.gpg Temporary failure resolving 'archive.raspberrypi.org' Err http://archive.raspbian.org wheezy Release.gpg Temporary failure resolving 'archive.raspbian.org' Err http://raspberrypi.collabora.com wheezy Release.gpg Temporary failure resolving 'rasp...
by rpdom
Wed Oct 02, 2013 6:06 am
Forum: Troubleshooting
Topic: Unable to install multiple packages
Replies: 6
Views: 2022

Re: Unable to install multiple packages

What error message do you get when you try to install screen?

Did you try

Code: Select all

sudo apt-get update
before trying

Code: Select all

sudo apt-get install screen
?

It may be that your package index is a bit out of date.
by rpdom
Tue Oct 01, 2013 7:30 am
Forum: General discussion
Topic: COBOL Forum
Replies: 24
Views: 4047

Re: COBOL Forum

It's been a few years (about 10, I think) since I last coded in COBOL (COBOL-74, to be precise). If I needed to do any low-level stuff I did it in assembler on the old Honeywell/Bull mainframe.
by rpdom
Mon Sep 30, 2013 7:09 am
Forum: Beginners
Topic: NFS and SMB at the same time?
Replies: 4
Views: 766

Re: NFS and SMB at the same time?

You can use SMB and NFS alongside each other quite happily.

I don't use my Pi for it, but do have a Debian Linux PC that has a disk shared via SMB (for my wife's WinXP PC), and also NFS for my Linux laptop :)
by rpdom
Sun Sep 29, 2013 9:07 pm
Forum: Bare metal, Assembly language
Topic: baking pi: external led
Replies: 8
Views: 1600

Re: baking pi: external led

I can't remember exactly, but the GPIO pins are only able to handle a few mA, maybe as much as 16mA but I would try to take as little current as possible from them. Somewhere like 2 mA should be enough to drive a mosfet transistor that will run a motor. Other people have driven motors from the GPIO ...
by rpdom
Sun Sep 29, 2013 8:35 pm
Forum: General discussion
Topic: Raspberry Pi 5v Split?
Replies: 4
Views: 1443

Re: Raspberry Pi 5v Split?

The 5V on the output pins is just a power connection. It is not controllable.

The controllable GPIO connections are only 3.3V at up to about 16mA maximum. I order to drive anything at 5V you will need to use some sort of buffer circuit, possibly with mosfet or darlington transistors.
by rpdom
Sun Sep 29, 2013 5:19 pm
Forum: Raspbian
Topic: apt-get update fails
Replies: 5
Views: 2733

Re: apt-get update fails

One thing I would do is to check that there is enough free space for the file, using "df -h /".

Then I would try to remove the corrupt file(s) with "sudo rm /var/lib/apt/lists/partial/*".

Finally, try the "sudo apt-get update" again.
by rpdom
Sun Sep 29, 2013 1:32 pm
Forum: Troubleshooting
Topic: RCA Video out not working [solved]
Replies: 22
Views: 22537

Re: RCA Video out not working

The config.txt file isn't stored in the same place on a NOOBS installation as it is in a straight Raspbian install. I believe that if you press Shift when prompted to get into the NOOBS recovery screen, you get an option to edit the config file. (This is just from what I've read here. I haven't used...
by rpdom
Sun Sep 29, 2013 11:50 am
Forum: Bare metal, Assembly language
Topic: baking pi: external led
Replies: 8
Views: 1600

Re: baking pi: external led

Aha, yes. The OK/ACT LED on GPIO 16 is connected between 3.3v and the GPIO, so it turns on when the GPIO is set to 0 (cleared), and off when the GPIO is set to 1 (set). I assume your external LED is linked via a resistor between the GPIO pin and 0V. Therefore you will need to set the GPIO to 1 to ma...
by rpdom
Sat Sep 28, 2013 8:29 pm
Forum: Bare metal, Assembly language
Topic: baking pi: external led
Replies: 8
Views: 1600

Re: baking pi: external led

p1 header: 18 GPIO 24 Ok, but your code is using GPIO 18. P1-12. To use GPIO 24 it would have to be something like .section .init .globl _start _start: ldr r0,=0x20200000 mov r1,#1 lsl r1,#12 str r1,[r0,#8] mov r1,#1 lsl r1,#24 str r1,[r0,#40] loop$: b loop$ (caveat: I haven't tested this, but I be...
by rpdom
Sat Sep 28, 2013 5:54 pm
Forum: Bare metal, Assembly language
Topic: baking pi: external led
Replies: 8
Views: 1600

Re: baking pi: external led

Which pin of P1 are you using?

GPIO 18 is connected to Pin 12 of P1.

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