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by timrowledge
Tue Dec 03, 2019 7:34 pm
Forum: Beginners
Topic: Question on headless mode
Replies: 21
Views: 586

Re: Question on headless mode

,I have have been able to connect via VNC in headless mode (no HDMI monitor attached) but the resolution is awfully low. I have tried to change it under raspi-config->advanced->resolution but it still remain awful, especially in full screen. Ps, I am on an iMac 27" 2019. Is there a way to improved ...
by timrowledge
Sat Nov 30, 2019 7:15 pm
Forum: General discussion
Topic: Problem with rpi4 boot time
Replies: 12
Views: 505

Re: Problem with rpi4 boot time

The best way to make startup time short is to not have any. Can you not keep the Pi running? You appear to be using it in a car and so you have a pretty big battery (even in an old fashioned ICE vehicle) available. There are things you can do to minimise power consumption when not actively running; ...
by timrowledge
Mon Nov 18, 2019 7:53 pm
Forum: Beginners
Topic: RasPi 4 model B - No video when connected through CP2102
Replies: 5
Views: 173

Re: RasPi 4 model B - No video when connected through CP2102

I’m amazed anything works with only 3.6v. You did read the bit where 5v is required? And can this regulator manage the current anyway?
Try powering the Pi with the proper voltage and current.
by timrowledge
Fri Nov 01, 2019 7:18 pm
Forum: Beginners
Topic: Virtual Pi development
Replies: 8
Views: 518

Re: Virtual Pi development

Buy another Pi for the colossal price of $35, $45 or $55 and set the preferences to use VNC. Run a VNC client on your other machine. Much cheaper than $650.
by timrowledge
Fri Nov 01, 2019 7:14 pm
Forum: General discussion
Topic: How to install the Raspberry Pi cross compiler on my Linux host machine?
Replies: 2
Views: 175

Re: How to install the Raspberry Pi cross compiler on my Linux host machine?

My first question is why you feel a need to do this. A Pi is perfectly capable of doing its own compiling for pretty much any project. About the only case I’ve read of which might justify a cross-compiler is building your own kernels. Take the simple route and compile locally unless you really, real...
by timrowledge
Sat Oct 12, 2019 6:16 pm
Forum: General programming discussion
Topic: Programming languages support
Replies: 37
Views: 3969

Re: Programming languages support

Thanks Tim, that's got it, much better on a Pi4 :D . Need to see if there is an Aarch64 version for Gentoo64. Nope, not yet, sorta. Writing a new Cog (the dynamic translation cpu specific part) is non-trivial. You *could* build the non-cogged VM on pretty much any machine that has a tolerable c com...
by timrowledge
Sat Oct 12, 2019 12:22 am
Forum: General programming discussion
Topic: Programming languages support
Replies: 37
Views: 3969

Re: Programming languages support

. Perhaps time to try a newer version? Please; go to www.squeak.org and download the linux(ARM) package. It’s the one on the front page under the three icons (for Mac, Windows & linux(X86)). I really wish we had never made the mistake of getting a download in the Debian wotsit. All it ever does is ...
by timrowledge
Fri Oct 11, 2019 8:31 pm
Forum: General programming discussion
Topic: Programming languages support
Replies: 37
Views: 3969

Re: Programming languages support

I would like to try Smalltalk but Squeak slows things down and it looks like cartoons. Perhaps you could spend a moment to explain this? How exactly does Squeak “slow things down”? How did you install it? I do hope it was not with apt-get since that would most likely install a ten or more year old ...
by timrowledge
Thu Oct 10, 2019 7:06 pm
Forum: General programming discussion
Topic: Programming languages support
Replies: 37
Views: 3969

Re: Programming languages support

Gavinmc42 wrote:
Thu Oct 10, 2019 1:00 am
https://squeak.org/
Wonder if there is a an Aarch64 version?
Not yet. I’d like to be working on it but other things are in the way. We have x64 for intel devices though so we know the fundamentals work.
by timrowledge
Wed Oct 09, 2019 6:04 pm
Forum: General programming discussion
Topic: Programming languages support
Replies: 37
Views: 3969

Re: Programming languages support

Smalltalk is considerably faster than python and offers easy access to gpio, web services, client-server, OS access, excellent developer tools, actual, real, portability, a sensible language and generally a lot of good things. There has been a Smalltalk available for ARM since before it was original...
by timrowledge
Fri Oct 04, 2019 5:41 pm
Forum: General discussion
Topic: Home AUtomation Using raspberry pi and nodemcu esp8266
Replies: 8
Views: 426

Re: Home AUtomation Using raspberry pi and nodemcu esp8266

You would probably find much of interest at https://tech.scargill.net/ a blog by a chap that has a great deal of fun doing exactly what you are asking about.
by timrowledge
Wed Oct 02, 2019 2:51 pm
Forum: Beginners
Topic: Multiple Pi's and Circuits with multiple Power Supplies in Parallel
Replies: 3
Views: 223

Re: Multiple Pi's and Circuits with multiple Power Supplies in Parallel

Take a look at the Bitscope Blade boards. They’ve already worked this out for you.
https://bitscope.com/product/blade/?p=about
by timrowledge
Tue Oct 01, 2019 4:01 pm
Forum: General discussion
Topic: Wirebender with a Raspberry PI and PiGPIO
Replies: 19
Views: 549

Re: Wirebender with a Raspberry PI and PiGPIO

If you want to move something a precise amount against the force required to bend wire I would recommend using servos. Steppers are good for all sorts of things but they have no indies where they are at any time. Servos can be commanded to a particular position rather than “move 6 steps”, which can ...
by timrowledge
Wed Sep 25, 2019 12:33 am
Forum: General programming discussion
Topic: Setting goals for programming
Replies: 7
Views: 1465

Re: Setting goals for programming

Learn some C because it is basically a more-or-less-portable assembler. Learn some Lisp to see the power of Lambdas. (Try to)Learn some Prolog to see what happens when lunacy happens in software. Learn some Smalltalk to understand why java is such a terrible thing. By this point you will have gained...
by timrowledge
Tue Sep 17, 2019 11:11 pm
Forum: Scratch
Topic: Raspberry Pi 4 and Scratch 2
Replies: 10
Views: 3021

Re: Raspberry Pi 4 and Scratch 2

:-)
by timrowledge
Tue Sep 17, 2019 6:33 pm
Forum: Beginners
Topic: Computer monitor & Raspberry Pi 4B
Replies: 5
Views: 267

Re: Computer monitor & Raspberry Pi 4B

Simpler to use VNC. No cable to buy.
Use the Pi preferences tool to enable VNC.
Install RealVNC on your Mac.
Done.
It’s been working perfectly for me (with minor variations over the years) since ‘13.
by timrowledge
Thu Sep 12, 2019 8:43 pm
Forum: Scratch
Topic: Raspberry Pi 4 and Scratch 2
Replies: 10
Views: 3021

Re: Raspberry Pi 4 and Scratch 2

Just out of interest because I don’t have a pi4 yet, does my ‘original ‘ Scratch run ok? It should but proof is always good.
by timrowledge
Wed Aug 21, 2019 6:02 pm
Forum: General discussion
Topic: Uses for Raspberry Pi Zero/Zero W?
Replies: 81
Views: 3812

Re: Uses for Raspberry Pi Zero/Zero W?

Not so very long ago a machine with the performance of a Pi zero was a thing of fantasy, affordable only for high end engineering workstations.
by timrowledge
Tue Aug 20, 2019 6:24 pm
Forum: Off topic discussion
Topic: double cpu's
Replies: 15
Views: 3644

Re: double cpu's

A 384 Core Cavium ThunderX 2 machine would be quite fast, but I fear the cost might put you off. Last time i looked we were talking $24000 without t ram and disks.
On the other hand the BitScope stuff could provide a 160 core Pi 4 based machine with plenty of ram and disc for less than $6k.
by timrowledge
Fri Aug 09, 2019 8:50 pm
Forum: General discussion
Topic: Using PiServer with Pi 4
Replies: 9
Views: 851

Re: Using PiServer with Pi 4

If you want to save time it might be worth getting a few 3B+ to do your experiments. They do usb and pxe boot and since time is (often) money in business...
by timrowledge
Thu Aug 01, 2019 6:21 pm
Forum: Off topic discussion
Topic: Before Raspberry Pi
Replies: 14
Views: 4021

Re: Before Raspberry Pi

It's even better. That 4Mz 8080 was probably running at 1 MIPs or so. The Pi 4 is more like 1 GIP. And it has 4 cores. 4000 times faster! 8080 was probably more like 0.5mips in practice. A72 ARM is multi-issue, out of order so much more than 1gip; likely 1.5 at least. And, obviously, at least 4 x t...
by timrowledge
Sat Jul 27, 2019 9:05 pm
Forum: General discussion
Topic: Raspberry pi for coding on machine level?
Replies: 31
Views: 1796

Re: Raspberry pi for coding on machine level?

Unless you’re planning on writing a code generator there really isn’t much reason to worry about the very lowest level type of programming. I’ve done a fair bit whilst creating dynamic code translation systems for x86/68k/alpha/spark/arm/hp7000/etc and to be honest it makes for a fairly unpleasant t...
by timrowledge
Tue Jul 23, 2019 8:00 pm
Forum: General programming discussion
Topic: ESC Direction
Replies: 6
Views: 1509

Re: ESC Direction

PeterO wrote:
Mon Jul 22, 2019 6:15 pm
Model boat ESC's are also normally reversible.
PeterO
Good point. I imagine at least some of them are water cooled as well, which could be fun for a car; an excuse for a radiator!
by timrowledge
Mon Jul 22, 2019 6:09 pm
Forum: General programming discussion
Topic: ESC Direction
Replies: 6
Views: 1509

Re: ESC Direction

Very few R/C plane ESCs provide reverse, so unless OP is using a car type ESC it is unlikely to be possible to get reversing.
by timrowledge
Sat Jul 20, 2019 3:40 pm
Forum: General programming discussion
Topic: Liberation through Computer Literacy
Replies: 1764
Views: 94834

Re: Project Digital Apocalypse Not Now

I just took advantage of the nice tweak gkriedel spotted and was pleased to see that it improved the calculation time for the big fib from circa 6secs to circa 4.8. Printing time, obviously, wasn’t changed. Your 30 second experience was not when using Squeak on an intel machine unless it is a 486 er...

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