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by timrowledge
Sat May 23, 2020 2:03 am
Forum: Off topic discussion
Topic: In which language is Chromium OS written?
Replies: 5
Views: 436

Re: In which language is Chromium OS written?

Problem with languages higher-level than C is all the nice features they make use of need runtime support from the OS and handling when they fail. C code needs runtime support too, y’know. So does assembler. It always makes me laugh when I hear people mention “oh it’s written in native C” and simil...
by timrowledge
Wed May 20, 2020 5:51 pm
Forum: General discussion
Topic: Multiple Pis from a single power supply
Replies: 10
Views: 357

Re: Multiple Pis from a single power supply

I’ve been using USB power supplies to run multiple Pi for years. Currently on my desk I have an Anker 6 port 60W unit that is happy to run 3 Pi plus an esp8266 and an Ethernet switch.
by timrowledge
Sat May 09, 2020 3:48 am
Forum: General discussion
Topic: RPi Zero + Ethernet Hat + POE Hat
Replies: 4
Views: 167

Re: RPi Zero + Ethernet Hat + POE Hat

thagrol wrote:
Fri May 08, 2020 2:35 pm
While I've not done it, a USB ethernet dongle combined with apropriate hardware to inject and tap power to/from the ethernet cable is probably the way to go.
I have, and it has been working perfectly well for something like 4 years.
by timrowledge
Wed May 06, 2020 5:58 pm
Forum: General discussion
Topic: Best RPI software that isn't in the Repos?
Replies: 15
Views: 783

Re: Best RPI software that isn't in the Repos?

Squeak Smalltalk of course. Www.squeak.org to download. Runs bit identical on Raspbian, Widows, MacOS , x86 & x64 Linux.
It’s what Scratch (the real one, not 2 or 3) is written in, so you already have an example of it on your Pi.
by timrowledge
Sat May 02, 2020 12:50 am
Forum: General discussion
Topic: Pi temp/humidity resistance?
Replies: 3
Views: 148

Re: Pi temp/humidity resistance?

Use your older Pi and put it in a decently sealed box. It won’t overheat doing such a low-duty job.
You might want to have a small drain hole at the bottom bin case of any condensation.
People have used Pi in tropical locations for weather monitoring etc with no issues.
by timrowledge
Thu Apr 30, 2020 6:12 pm
Forum: Scratch
Topic: Scratch resources for adults?
Replies: 21
Views: 2669

Re: Scratch resources for adults?

Latest release of Squeak is 5.3, available from www.squeak.org *but* we discovered an embarrassing fatal bug in the packaging recently. It'll be fixed soon. The Nuscratch code is loadable in 5.3, though I haven't yet updated everything officially. I'll get around to it soon and offer an update to th...
by timrowledge
Sun Apr 26, 2020 4:42 pm
Forum: General discussion
Topic: Extreme browsing with pi?
Replies: 18
Views: 575

Re: Extreme browsing with pi?

You could save a lot of pain by using the ‘real’ Scratch still installed. Just choose “Scratch” instead of “Scratch 2” or “Scratch 3” from the menu.
It’s faster. You can get to the underlying code very simply. It isn’t Flash. It doesn’t need a vast steaming pile of browser to run.
by timrowledge
Sat Apr 18, 2020 4:47 pm
Forum: General programming discussion
Topic: Which IDE to choose for program development?
Replies: 4
Views: 380

Re: Which IDE to choose for program development?

If you are stuck with C etc you may not want to try Smalltalk, which is the only IDE I would recommend. If you’re interested in trying out something actually good though, give www.squeak.org a look. And you don’t have to do python to use tensorflow & elastic search etc. We talk directly to them from...
by timrowledge
Wed Apr 15, 2020 4:46 pm
Forum: General discussion
Topic: Hello and some doubts
Replies: 11
Views: 556

Re: Hello and some doubts

So you’re testing cable assemblies with up to 108 conductors? That sounds fun - what are they for? In principle this is easy and a Pi can handle it trivially. Basically I’d suggest a physical harness that you plug the each end of the cable into (are they flexible enough to have the two connectors ad...
by timrowledge
Tue Apr 07, 2020 6:31 pm
Forum: Beginners
Topic: Anemometer
Replies: 38
Views: 1286

Re: Anemometer

That looks like a quite nice anemometer. Seems to have internal electronics to provide RS 485 output, so probably does all the debouncing for you. Much nicer than the el-cheap plastic + reed switch unit I currently have!
by timrowledge
Fri Apr 03, 2020 7:21 pm
Forum: Off topic discussion
Topic: "Distance Learning" on a Pi?
Replies: 16
Views: 1746

Re: "Distance Learning" on a Pi?

Well a trivial search shows that people have had jitsi running on Pi - the very first hit is https://www.instructables.com/id/Video- ... erry-Pi-3/ from several years ago.
Pi 4 ought to be pretty good at it.
by timrowledge
Fri Apr 03, 2020 7:15 pm
Forum: Raspberry Pi OS
Topic: Just for fun.
Replies: 12
Views: 546

Re: Just for fun.

There are a couple of high core count ARM boards out nowadays - might be one of those. I’m fairly sure some of the ThunderX cpus have 384 cores. That would make a nice super-pi for a fairly super price. Apparently Avantek in lancs. sell some interesting boxes in that line but we are talking around ...
by timrowledge
Wed Apr 01, 2020 7:20 pm
Forum: Off topic discussion
Topic: "Distance Learning" on a Pi?
Replies: 16
Views: 1746

Re: "Distance Learning" on a Pi?

Given the ... issues... with Zoom it might be a god time to see if jitsi can be made to run adequately on a Pi. I haven’t even got around to trying it on any machine yet but I’m assured it is quite good.
See jitsi.org
by timrowledge
Sun Mar 29, 2020 6:30 pm
Forum: Advanced users
Topic: Problem accessing files via CIFS; a recent change in behaviour
Replies: 2
Views: 267

Re: Problem accessing files via CIFS; a recent change in behaviour

Yeah, it's quite insane seeming isn't it? What is different about those files/directories? I haven't been able to see any difference in owners, groups, permissions, anything except when they were created. And yet my older Stretch running Pi has no such issue. I just realised I messed up and double-p...
by timrowledge
Fri Mar 27, 2020 3:35 am
Forum: Raspberry Pi OS
Topic: Buster CIFS fstab problems
Replies: 3
Views: 306

Re: Buster CIFS fstab problems

Not entirely sure what you mean by “iMac is old” but it seems to happily support Vers =1.0, 2.0 or 3.0 - only 3.11 raises a complaint. One of the things that causes much confusion is how the behaviour seems to differ between cmdline mount and fstab lines. And the seemingly wide variations of the con...
by timrowledge
Wed Mar 25, 2020 8:51 pm
Forum: Raspberry Pi OS
Topic: Buster CIFS fstab problems
Replies: 3
Views: 306

Buster CIFS fstab problems

I have three machines involved in a circle of CIFS confusion that is driving me nuts. Pointers to doc, advice on settings, commiseratory chocolate all gratefully received. tl;dr - Buster CIFS fstab mouting seems to be borked Machine A - an iMac running Mac OS Mojave. On this I have (duh) a lot of fi...
by timrowledge
Wed Mar 18, 2020 3:46 am
Forum: General discussion
Topic: Raspberry Native C and Speed Tests
Replies: 55
Views: 5856

Re: Raspberry Native C and Speed Tests

I really don't like C being described as any kind of assembler either. It's just wrong. When one has to manually handle memory, and poke at things with pointers, then it really isn’t much more helpful than bare assembler. I work on dynamic code generators and virtual machine design; I do actually h...
by timrowledge
Wed Mar 18, 2020 3:40 am
Forum: General discussion
Topic: Raspberry Native C and Speed Tests
Replies: 55
Views: 5856

Re: Raspberry Native C and Speed Tests

ejolson wrote:
Mon Mar 16, 2020 6:58 pm

The DEC PDP-8 is a simple accumulator architecture without a hardware stack which is a very difficult match for the C programming language. Did you mean the PDP-11 by any chance?
PDP-11? Yeah, quite possibly.
by timrowledge
Wed Mar 18, 2020 3:39 am
Forum: General discussion
Topic: Raspberry Native C and Speed Tests
Replies: 55
Views: 5856

Re: Raspberry Native C and Speed Tests

jahboater wrote:
Mon Mar 16, 2020 9:47 pm
timrowledge wrote:
Mon Mar 16, 2020 6:46 pm
C is basically a jumped up PDP-8 assembler with delusions of grandeur.
When did you last use C for real projects?

Please take an unbiased look at C18 or C2x.
Today. And no, not going to happen.
by timrowledge
Mon Mar 16, 2020 6:51 pm
Forum: General discussion
Topic: Viruses on Linux
Replies: 22
Views: 1337

Re: Viruses on Linux

I actually got one of those things this morning for probably the first time in five years. I got all misty eyed and nostalgic...
by timrowledge
Mon Mar 16, 2020 6:46 pm
Forum: General discussion
Topic: Raspberry Native C and Speed Tests
Replies: 55
Views: 5856

Re: Raspberry Native C and Speed Tests

C is basically a jumped up PDP-8 assembler with delusions of grandeur. As it happens,that is a quite useful thing to use for a lot of purposes. It’s horribly inefficient as a way of describing complex problems *unless* it is the only way you have to deal with it; then it’s a case of doing the best y...
by timrowledge
Sat Mar 14, 2020 11:59 pm
Forum: Advanced users
Topic: Problem accessing files via CIFS; a recent change in behaviour
Replies: 2
Views: 267

Problem accessing files via CIFS; a recent change in behaviour

In brief: I have a CIFS conenction from my Pi (buster) to my iMac (Mojave). The line in /etc/fstab has worked for years; now I have problems reading *some* files with *some* programs. Huh? Longer: I've had a working connection from Pi to iMac for a long time. I use it to allow me to keep as much as ...
by timrowledge
Fri Mar 06, 2020 7:25 pm
Forum: General discussion
Topic: Cluster of Pi4Bs to run Pandas et al. in production, does it make sense?
Replies: 11
Views: 482

Re: Cluster of Pi4Bs to run Pandas et al. in production, does it make sense?

Assuming the code is available I’d suggest that getting a Pi and making sure that it can be built on it, then simply try running some example jobs would make for a far better answer than any of us guessing. If the typical job is doable on a Pi and if they are not complexly interconnected in a way th...

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