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by rpdom
Thu Feb 27, 2020 6:21 pm
Forum: General discussion
Topic: Does the Raspberry Pi 4 throttle at 60 C or 70 C? (also question about fan PWM speed)
Replies: 6
Views: 162

Re: Does the Raspberry Pi 4 throttle at 60 C or 70 C? (also question about fan PWM speed)

sofakng wrote:
Thu Feb 27, 2020 5:51 pm
Is it possible to rollback to the latest stable release?
You should be able to get back with

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apt --reinstall install raspberrypi-bootloader raspberrypi-kernel
by rpdom
Thu Feb 27, 2020 4:20 pm
Forum: Networking and servers
Topic: Testing website from local network
Replies: 6
Views: 95

Re: Testing website from local network

stockton wrote:
Thu Feb 27, 2020 3:46 pm
Were you using http://stockton.co.za ? or http://stockton.co.za/lcars ? The shtml does exist.
Now when I try, the first of those links gives me an "Authorisation Required" page and the second link gives a "Not Found". I clicked on the link in your first post earlier.
by rpdom
Thu Feb 27, 2020 3:15 pm
Forum: Advanced users
Topic: Powering my RPi projects using buck converters
Replies: 9
Views: 173

Re: Powering my RPi projects using buck converters

Nice build but based on the photos, you seem to bypass the polyfuse of the Pi's? The Pi 4B does not have a polyfuse. Good to know, is there still any protection from over current (or other danger)? (Does this mean it is safe to bypass my Pi 3B+ polyfuse?) Have a look at the documentation. The parti...
by rpdom
Thu Feb 27, 2020 2:54 pm
Forum: Advanced users
Topic: Powering my RPi projects using buck converters
Replies: 9
Views: 173

Re: Powering my RPi projects using buck converters

sora03 wrote:
Thu Feb 27, 2020 2:38 pm
Nice build but based on the photos, you seem to bypass the polyfuse of the Pi's?
The Pi 4B does not have a polyfuse.
by rpdom
Thu Feb 27, 2020 1:06 pm
Forum: Networking and servers
Topic: Testing website from local network
Replies: 6
Views: 95

Re: Testing website from local network

I get a 404 Not Found when following your link. Does the file index.shtml exist?
by rpdom
Thu Feb 27, 2020 1:01 pm
Forum: General discussion
Topic: Enable SSH before first boot
Replies: 17
Views: 83784

Re: Enable SSH before first boot

B.Goode wrote:
Thu Feb 27, 2020 12:52 pm
The file is named ssh and needs no extension.
Although ssh.txt is also recognised.
by rpdom
Thu Feb 27, 2020 8:23 am
Forum: General discussion
Topic: Pi4 1GB Availability? US Distributor Shows It As Discontinued
Replies: 27
Views: 1111

Re: Pi4 1GB Availability? US Distributor Shows It As Discontinued

It's on the Blog now. Pricing for the 4GB version is remaining the same. The 1GB version will still be available at $35 for industrial and commercial customers only. No mention of an 8GB version.
by rpdom
Thu Feb 27, 2020 6:11 am
Forum: Other programming languages
Topic: Introduction to BBC BASIC
Replies: 626
Views: 60252

Re: Introduction to BBC BASIC

you could have used a binary file viewer I tend to use hexdump, which is included in Raspbian. With the "-C" option it produces output similar to the various Dump utilities on the BBC Micro :) pi@raspberrypi:/tmp $ hexdump -C file1 00000000 01 02 03 04 |....| 00000004 pi@raspberrypi:/tmp $ hexdump ...
by rpdom
Wed Feb 26, 2020 8:19 pm
Forum: General discussion
Topic: Raspberry Pi GPU Concept
Replies: 18
Views: 582

Re: Raspberry Pi GPU Concept

It would probably help if there was a Raspberry Pi Compute Module with USB3.0. But there isn't (yet). Also you won't get gigabit ethernet working on one. The best you'll get is about 350Mb/s via the single USB2.0 channel.

Things may change if a CM4 comes out.
by rpdom
Wed Feb 26, 2020 6:31 pm
Forum: Bare metal, Assembly language
Topic: a basic debugger/assembler for learning bare metal ARM ?
Replies: 6
Views: 139

Re: a basic debugger/assembler for learning bare metal ARM ?

Gosh, I used to write assembler for x86 using the debug program before I started using Richard Russell's BBC Basic on a PC with it's handy built in assembler. I already use BBC Basic on 6502 (BBC Micro) and ARM (Archimedes and BBC Micro).
by rpdom
Wed Feb 26, 2020 6:18 pm
Forum: Networking and servers
Topic: NAS Guide?
Replies: 8
Views: 159

Re: NAS Guide?

I think the bots took all the good names. Well, it wasn't a bot, but my first choice of username was already taken when I joined, so I used my other main username instead. My NAS runs on a Pi 2B with a 2TB HDD. It uses SAMBA and NFS for access. I do weekly rsync backups of it to two other Pi with H...
by rpdom
Wed Feb 26, 2020 4:13 pm
Forum: Troubleshooting
Topic: Problem booting Raspberry Pi 3 image on Raspberry Pi 4
Replies: 6
Views: 144

Re: Problem booting Raspberry Pi 3 image on Raspberry Pi 4

I usually use something like "tar" to create a backup file from each of the two partitions. Then swap cards and extract the contents to the new card.

I do that on a Linux laptop which has sufficient storage to hold the backup files.
by rpdom
Wed Feb 26, 2020 3:25 pm
Forum: Networking and servers
Topic: Can't ping google or any external hostnames from Pi
Replies: 8
Views: 160

Re: Can't ping google or any external hostnames from Pi

It's definitely a DNS issue then. Not sure what. Your router is claiming to be the DNS server and your manual lookup using "host" was working, which is weird. But the DNS is failing to resolve in any of the above commands.

Very odd.
by rpdom
Wed Feb 26, 2020 2:36 pm
Forum: Raspbian
Topic: Is it possible to unset a mime type?
Replies: 8
Views: 178

Re: Is it possible to unset a mime type?

wget can use cookies. If you can get at the cookie details from your browser you can save those into a file and tell wget to use them.
by rpdom
Wed Feb 26, 2020 5:59 am
Forum: Networking and servers
Topic: Can't ping google or any external hostnames from Pi
Replies: 8
Views: 160

Re: Can't ping google or any external hostnames from Pi

What were the responses from

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ping www.google.com
?

Could you also try

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traceroute www.google.com
and see how far it gets.

Also, last one is: have you tried restarting your router?
by rpdom
Wed Feb 26, 2020 5:36 am
Forum: Windows 10 for IoT
Topic: Unable to deploy Windows IoT Core on RPI4 [Win10IOT doesn't work on a 3B+ nor on a RPI4 !!!]
Replies: 8
Views: 236

Re: Unable to deploy Windows IoT Core on RPI4

I shall not ask Microsoft. I shall ask RaspberriPi developers. They use components (Microchip Ethernet/Wifi or someting like that) , they know which drivers must be inserted in Windows ARM image before installation. If the drivers are not compatible with Windows OS (which is rare case) then they wi...
by rpdom
Tue Feb 25, 2020 8:17 pm
Forum: Troubleshooting
Topic: [Resolved] Pi4 - Access Denied VNC Viewer/Ethernet Crash
Replies: 4
Views: 63

Re: Pi4 - Access Denied VNC Viewer/Ethernet Crash

[edit] Original post has now been deleted.
by rpdom
Tue Feb 25, 2020 8:14 pm
Forum: Troubleshooting
Topic: [Resolved] Pi4 - Access Denied VNC Viewer/Ethernet Crash
Replies: 4
Views: 63

Re: Pi4 - Access Denied VNC Viewer/Ethernet Crash

*(Moved this from beginner, seems more appropriate here)* Please, if you wish a post to be moved to a more appropriate section, click the "! - Report Post" icon and leave a message that you would like it moved. The moderators are happy to do that for you rather than have to deal with duplicated pos...
by rpdom
Tue Feb 25, 2020 7:48 pm
Forum: Beginners
Topic: Please help me understand the clock pin of Serial RS232 communication
Replies: 27
Views: 405

Re: Please help me understand the clock pin of Serial RS232 communication

drgeoff wrote:
Tue Feb 25, 2020 6:50 pm
rpdom wrote:
Tue Feb 25, 2020 6:48 pm
The diagrams seem to show it being connected between the PC and keyboard
No, the diagrams don't show or even imply that.
Look again at the "System Connection Method" pictures. The keyboard is plugged into the "Input Tool", which is then plugged into the PC via a Keyboard cable.
by rpdom
Tue Feb 25, 2020 6:48 pm
Forum: Beginners
Topic: Please help me understand the clock pin of Serial RS232 communication
Replies: 27
Views: 405

Re: Please help me understand the clock pin of Serial RS232 communication

I don't see anything about 4-bit 'bytes' in those specs. (Not quoted again here to save bulk.) But in the document I previously cited it definitely says 8-bits, under the 'communication' heading, bottom right. Possibly it is returning 4-bit values as ASCII characters "0" to "9" and "A" to "F"? They...
by rpdom
Tue Feb 25, 2020 6:19 pm
Forum: Troubleshooting
Topic: Problem booting Raspberry Pi 3 image on Raspberry Pi 4
Replies: 6
Views: 144

Re: Problem booting Raspberry Pi 3 image on Raspberry Pi 4

Upgrading from Stretch to Buster has never been recommended. The main problem encountered when upgrading is that the /boot partition has increased in size to 256MB. On the upgrades that I have (successfully) done*, I used a new card with the appropriate partition sizes and copied the contents of th...
by rpdom
Tue Feb 25, 2020 7:55 am
Forum: Networking and servers
Topic: fulltime email server - storage configuration
Replies: 1
Views: 89

Re: fulltime email server - storage configuration

Simpler to have just the /boot partition on the SD card (which hardly ever gets written to) and the rest of the system on the SSD.
by rpdom
Tue Feb 25, 2020 7:11 am
Forum: Troubleshooting
Topic: Bare HDD + SATA to USB adapter not working on Pi 4
Replies: 8
Views: 206

Re: Bare HDD + SATA to USB adapter not working on Pi 4

Rather than taking apart and soldering to the SATA/USB adaptor, I got some short SATA extension cables which had separate power and data connections and cut the red, yellow and one of the black wires and connected those to a 12V + 5V PSU to run the drive. I have a few old PSUs that used to power ext...
by rpdom
Mon Feb 24, 2020 8:21 pm
Forum: General discussion
Topic: Using an RPi4 as a backup server on a different network_
Replies: 7
Views: 161

Re: Using an RPi4 as a backup server on a different network_

I think the configuration you're wanting can be done via OpenVPN, but I can't remember how.

I use a different VPN (tinc) via an external server. Any machine that is allowed to connect to that server with tinc is given a 192.168.x.x IP address on my home LAN and can be used as if it were local.
by rpdom
Mon Feb 24, 2020 6:04 pm
Forum: General discussion
Topic: New Pi 4B v1.2?
Replies: 331
Views: 44824

Re: New Pi 4B v1.2?

It's it just me, or is the Hackaday comments section getting more trolly lately? Or maybe I just read it more often these days? It's trying to reach the level of trolling and click-baiting on https://www.theregister.co.uk/ and, mostly, succeeding. It won't be long before I stop reading it like I've...

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