Raspberry Pi Forums

ejolson

Hi, Most sellers advice not to use the official RPi4 power supply with older Raspberry models. While I understand that they use a different plug, is there really any good reason why not to use it, if you have one of those tiny USB-C - microUSB adapters? For some reason the RPi4 PSU is much cheaper ...

ejolson

Hi, Looking to buy https://thepihut.com/products/raspberry-pi-4-desktop-kit?src=raspberrypi for my kid. He is 12. When I read about reviews about the 4 GB model, some people are saying 4 GB is slow, and preferrably should go for 8 GB. In this website, I don't see a 8GB UK variant. Would you recomen...

ejolson

the screenshot is claiming you have partition type 3 with a size of 0, which doesnt sound right it feels like the partition table may be corrupted, which both fdisk and disk manager could confirm Agreed. Something looks wrong with the partition table. Have you tried removing the card and putting it...

ejolson

No. Not 'run'. That does not function as safe power cycle. I use GPIO3 with overlay. No other pin can be used for that AFAIK. I just measured what it takes to gnd that pin on a Pi4 and it was 1.7ma. I need to use 900ohm resistor maximum to activate it for a current project. Power up is slightly dif...

ejolson

Reminds me immediately of the Krel machine: Ever stop to think about how *slow* the Krell machine would be? Tens of miles in extent. What would the clock speed be? Side note...the Krell monster animation was done by Disney, The Krell machine clearly uses differential quantum interconnects for which...

ejolson

FYI the corresponding power cycle pin on Pi takes much more current. Not that there is any need to control Pi from PC. Not that modern PCs have any IO to do that these days anyway. Is the power cycle pin on the Pi called run? How much current does it take? Would there be any difficulty using the GP...

ejolson

Since compiling rpiboot had turned into frustration, for more of the same I set up a socially-distanced Zoom appointment with the lead developer of FidoBASIC to contract a version of funopen that runs without misery, sorrow or weariness on Linux. The canine expert in n-level metaprogramming refused ...

ejolson

ejolson: Not sure what your end game is? Makes me think. If I had that many Pis in a data center I'd likely set 1 Pi up as a master/network boot to share server drive space with a raid 1 config to protect customer data (2x 4TB or 8TB 860 Pro drives). On the rest of the 8GB Pi's I'd run docker on th...

ejolson

It would be nice to boot the Zero over USB using rpiboot as is done on the super-cheap cluster https://www.raspberrypi.org/forums/viewtopic.php?f=49&t=199994 The first obstruction in doing this is the fact the USB hubs that I'm using seem not to reliably recognize the Zero when first powered up. It ...

ejolson

Since no model of Raspberry Pi includes hardware AES instructions, significantly better VPN speeds are obtained using WireGuard. The results at https://www.raspberrypi.org/forums/viewtopic.php?t=251159#p1533989 indicate a Zero can achieve about 36 megabit/sec. This could be a problem if you have gig...

ejolson

I decide the test the voltage of my .99 cent USB buck that says it's rated for 3A. Not that I don't trust a .99c buck. But... want to check the voltage before plugging my 8GB Pi into it! Hooked it up to my bench power supply and sparks! :x Apparently the positive and negative inputs are shorted fro...

ejolson

Is this a useful thing or not? https://www.tomshardware.com/uk/amp/news/nvidia-engineer-vulkan-driver-raspberry-pi-quake-iii-100-fps I have no idea what all this Vulkan stuff is about anyway. Perhaps someone could enlighten me. More information is contained in the thread https://www.raspberrypi.org...

ejolson

As a start for filling the case described in https://www.raspberrypi.org/forums/viewtopic.php?t=272660#p1678218 with Pi computers, I installed a single Pi Zero next to the micro ATX motherboard. The Zero is connected to a tiny 4-port USB2 hub which is in turn connected to one of the motherboard head...

ejolson

There are certainly molex to USB A female adapters about. Try ebay. Or roll your own by modifying a molex to almost anything adapter/extention cable. Usually red is +5v. Current will only be a problem if you have a lot of devices on the 5v line. One thing to be aware of though: the 5v power from th...

ejolson

To help support everyone during the coronavirus epidemic, Springer has released a ton of free textbooks. Among the many books available at https://www.springernature.com/gp/librarians/news-events/all-news-articles/industry-news-initiatives/free-access-to-textbooks-for-institutions-affected-by-corona...

ejolson

bassamanator wrote: ↑
Sat Jun 20, 2020 9:34 pm
1.586Gflops is it?

I need this test to run longer to check for stability :/

Maybe that's 15.86 GFLOPS.

ejolson

Single Thread Cache and RAM Benchmarks These measure performance using data from caches and RAM. There appears to be a compiler issue, in this area, where single precision (SP) speeds are shown to be much slower than using Double Precision (DP), when the opposite should apply. Integer speeds can al...

ejolson

So other than pepperflash, is there any other reason to prefer Chromium over Firefox or any of the other browsers? I'm still excited about the rendering engine under development by Mozilla and Samsung called servo, as its name fits well with the physical computing theme of the Raspberry Pi. The RPF...

ejolson

Also, to the person who suggested that maybe only the floating point unit is having trouble - that's possible, but if it is having errors how close are other portions of the processor to making mistakes? It could be that they are making mistakes and you just haven't seen them because you don't have...

ejolson

If all that has to be done is to complete the circuit on the motherboard header, could you have a small relay controlled by the pi that does make that circuit? That should also work. First there were relays, then tubes, then transistors and finally integrated circuits. Given the nature of the task,...

ejolson

Could Google's pepper flash derivative be supported beyond the end of life date set by Adobe? Google is EOLing the closed-source Pepperflash before Adobe's end of year deadline. So no: it's dead. https://www.blog.google/products/chrome/saying-goodbye-flash-chrome/ So other than pepperflash, is ther...

ejolson

scruss wrote: ↑
Fri Jun 19, 2020 11:01 pm

fruitoftheloom wrote: ↑
Fri Jun 19, 2020 5:19 pm
...do alternative browsers offer FlashPlayer ?
Flash is dead/gone/outtahere on every browser on 2020-12-31, so the problem of Flash won't trouble us much longer.

Could Google's pepper flash derivative be supported beyond the end of life date set by Adobe?

ejolson

Wake on LAN does work. You need to enable it on the BIOS menus. Reliable instruction how to turn on and off a computer with a Pi are at https://github.com/thagrol/fakewake I'm aware that it "does" work, I have just been unable to "get it to work". I used to use it all the time 10-15 years back. Mor...

ejolson

Maybe a rabbit:

https://www.etsy.com/no-en/listing/6047 ... rabbit-pet

This one even has hardware attached on top (a HAT). More pictures are at the link.

ejolson

It takes ages to get our patches in to each version of Chrome, simple because Google make so many changes for each version - a real horror of a moving target. So it doesn't matter which version you target - you are always going to be a few version behind once it's ready to release. My recollection ...

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