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by Bakul Shah
Sat Oct 13, 2018 1:13 am
Forum: Plan 9
Topic: I/O performance question(s)
Replies: 2
Views: 1011

Re: I/O performance question(s)

You can use venti for backups -- it is a content addressable block storage. It is not the fastest but may be good enough if your incrementals are on the order of few hundred megabytes. You never do *full backup* every month as each unique block is written only once. The end result of each backup is ...
by Bakul Shah
Fri Aug 03, 2018 7:10 am
Forum: Plan 9
Topic: WiFI on Raspberry Pi 3
Replies: 8
Views: 1683

Re: WiFI on Raspberry Pi 3

Could not perform cross-compilation. I even pulled the source from Plan9front and tried to compile it on the device - the attempt ended in failure. Cross-compilation also on Plan9front did not help - could not pull out the executable file - it's just not copied ... I was able to cross-compile with ...
by Bakul Shah
Wed Aug 01, 2018 6:41 am
Forum: Plan 9
Topic: WiFI on Raspberry Pi 3
Replies: 8
Views: 1683

Re: WiFI on Raspberry Pi 3

I heard about this fork. The only thing for which I'm interested in updates is Python 2.5.1 (I could not build it from the sources that I extracted from contrib and plan9front) or ObjectIcon (I simply do not get it from the source code at the linking stage, although it fully adapted to Plan9) :( Wh...
by Bakul Shah
Tue Jul 31, 2018 9:21 pm
Forum: Plan 9
Topic: WiFI on Raspberry Pi 3
Replies: 8
Views: 1683

Re: WiFI on Raspberry Pi 3

There is still a question, if you do not mind: does the update with replica now work? I am afraid not. The sources.cs.bell-labs.com (from where the updates were being pulled) is gone. Note that there are hardly any changes to the base sources any more. If you just want to play with plan9 this is mo...
by Bakul Shah
Tue Jul 31, 2018 9:04 am
Forum: Plan 9
Topic: WiFI on Raspberry Pi 3
Replies: 8
Views: 1683

Re: WiFI on Raspberry Pi 3

See https://www.mail-archive.com/[email protected].net/msg37143.html for some help. It has one mistake: ether1=type=4330 should go in cmdline.txt , not config.txt on the dos partition. See cmdline-wifi.txt for an example. Latest disk image can be downloaded from https://9p.io/sources/contrib/miller/ . You...
by Bakul Shah
Wed Jun 20, 2018 10:12 pm
Forum: General discussion
Topic: Pi Is Too Complicated
Replies: 113
Views: 6319

Re: Pi Is Too Complicated

I would suggest that the Raspberry Pi have a stable operating system targeted for use in teaching computer science that is easy to understand and to modify. But what would that be ? I don't think there are many Operating Systems which are easy to understand and modify, and it's a rather niche area ...
by Bakul Shah
Wed Jun 20, 2018 10:00 pm
Forum: General discussion
Topic: PMs being turned off from June 13
Replies: 54
Views: 3787

Re: STICKY: PMs being turned off from June 13

Is there a way to get an archive of my past PMs (and responses to them)? Thanks.
by Bakul Shah
Fri Apr 13, 2018 2:32 am
Forum: Plan 9
Topic: plan9 support for 3B+
Replies: 0
Views: 2606

plan9 support for 3B+

FYI. Richard Miller has added support for 3B+ to 9pi. From his email to the 9fans list: Apart from 3B+ support (including firmware files for the new wifi chip), this update should make some improvement on all Pi models: slightly faster usb and ethernet, corrections for a few very old Plan 9 bugs flu...
by Bakul Shah
Wed Nov 02, 2016 7:17 am
Forum: Plan 9
Topic: IBM USB keyboard not detected
Replies: 5
Views: 5110

Re: IBM USB keyboard not detected

If nobody has any ideas, perhaps you could tell me a couple of better places/people to ask? Thanks plan9 doesn't handle as many different kinds of keyboards as Linux. You'll have a better chance of success with a basic, nothing fancy keyboard (the one I use is under $10 in the US). As for where to ...
by Bakul Shah
Mon Aug 17, 2015 4:33 am
Forum: Off topic discussion
Topic: Lemon Pi, $35 ARM Quad-core A9 open source board
Replies: 63
Views: 13790

Re: Lemon Pi, $35 ARM Quad-core A9 open source board

This seems to be the same board as (or very very similar to) Actions Technology's bubblegum-s500 devel. board
by Bakul Shah
Thu May 07, 2015 7:06 pm
Forum: Plan 9
Topic: Plan 9 on Raspberry Pi 2
Replies: 4
Views: 7191

Re: Plan 9 on Raspberry Pi 2

kyounger wrote:so has 9pi been made to work on Pi2 with SMP enabled? if so, is there a iso somewhere?
Yes. You can pick up 9pi.img.gz from the link supllied in the first message in this thread.
by Bakul Shah
Fri Feb 06, 2015 6:49 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 96855

Re: The Raspberry Pi 2 Q&A thread

I reread the Sept 19, 2012 blog post on the turbo mode (aka the irreversible bit and the voided warranty) but am still not clear. If the bit is set, is the warranty voided? In the context of Pi2, are there any settings (manually done) that will void the warranty?

Thanks!
by Bakul Shah
Wed Aug 27, 2014 7:04 am
Forum: FreeBSD
Topic: Unable to build any ports
Replies: 7
Views: 2205

Re: Unable to build any ports

Has anyone successfully built any port on a Raspberry Pi? I've tried a few but get lots of errors which I don't understand and can't help wondering if I've missed something... When building a port is there normally a buildlog so that I have a record of any error messages generated? I would love to ...
by Bakul Shah
Mon Jul 07, 2014 5:54 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 118
Views: 130730

Re: Raspberry Pi and 4k @ 15Hz

Interesting. Can you get 3840 x 2160 @ 24Hz? You may need to increase the hdmi pixel clock limit. It defaults to 163682864. Perhaps try hdmi_pixel_freq_limit=400000000 What is the highest supported pixel clock frequency? On plan9 I can get "4k" @20Hz but at 24Hz the display seems to turn itself off...
by Bakul Shah
Sun Nov 03, 2013 7:50 pm
Forum: Beginners
Topic: IP address for crossover cable
Replies: 36
Views: 3738

Re: IP address for crossover cable

To test, you can just use telnet, no need for the client program! On the linux machine just do telnet 192.168.1.1 1234 It should return something like Trying 192.168.1.1... Connected to 192.168.1.1. Escape character is '^]'. To get out type ctl-] followed with q. If this works then the problem is in...
by Bakul Shah
Sun Nov 03, 2013 7:22 pm
Forum: Other programming languages
Topic: Asm tuts
Replies: 63
Views: 15315

Re: Asm tuts

If you're seeing odd characters, they are coming from the tools you're using to cut / paste / edit. Still, to save time, assuming you've saved to a file, try this: perl -pi -e 's/\s/ /misg' filename.txt …which will move all "whitespace" characters to plain ascii spaces. Shouldn't take more than a m...
by Bakul Shah
Thu Oct 17, 2013 1:02 pm
Forum: Staffroom, classroom and projects
Topic: BASIC - more harmful than useful?
Replies: 899
Views: 122562

Re: BASIC - more harmful than useful?

[Edit: Man, that Loop construct in Scheme is WEIRD] Basically (let foo ((arg1 val1) ...) body) is equivalent to (begin (define (foo arg1 ...) body) (foo val1 ...)) When you call foo as the last thing from body, you've got a loop since in Scheme tail recursion is guaranteed to not increase stack spa...
by Bakul Shah
Tue Oct 15, 2013 8:53 am
Forum: Other programming languages
Topic: Brand New Graphical Development System
Replies: 54
Views: 8642

Re: Brand New Graphical Development System

Search for visual programming language or data flow language. You'll find lots of stuff. IMHO it would be hard to come up with something innovative that is easy to use and scales to realistic program sizes. But don't let other people's skepticism stop you if you think you have a great idea! In terms...
by Bakul Shah
Wed Sep 25, 2013 7:14 am
Forum: Plan 9
Topic: '\|' Key and Recompiling Kernel
Replies: 2
Views: 3985

Re: '\|' Key and Recompiling Kernel

I have a non-responsive '\|' key. I have followed the instructions from https://groups.google.com/forum/#!topic/comp.os.plan9/ycok6NTCWCg and by editing /sys/lib/kbmap/uk I now have the '\' working. To get the shift+'\|' to give me '|' I have edited /sys/src/9/omap/kbd.c if(kbscan->esc1 && c != 0x5...
by Bakul Shah
Mon Jul 08, 2013 5:54 pm
Forum: General discussion
Topic: Project idea: Pool Water Leveler
Replies: 23
Views: 4441

Re: Project idea: Pool Water Leveler

Reviews of commercial pool levelers on Amazon can give you an idea of what works well. Everyone seems to be using a float. Using an RPi for this seems like an overkill as this is a very simple closed loop system. An ATtiny would be more reliable, use less power etc. You can wake it up once a day to ...
by Bakul Shah
Mon Jul 08, 2013 4:41 pm
Forum: Staffroom, classroom and projects
Topic: kitting out a classroom
Replies: 128
Views: 36042

Re: kitting out a classroom

Checks the contents of local_server/home/$USER and copies the contents to remote_server/home/$USER every evening? csync2 can be used to keep files on multiple hosts in sync (I have played with it some but no real experience). There is also lsyncd (live sync daemon). As for sharing home directories,...
by Bakul Shah
Mon Jul 08, 2013 7:28 am
Forum: Off topic discussion
Topic: I think there is a world market for maybe five computers...
Replies: 23
Views: 3480

Re: I think there is a world market for maybe five computers

I once read that the whole miniaturization and going to devices like the 7400 series was possible because of the need (and willingness to pay) of the Apollo program for such devices. Curious in how far THAT is true. You read that right! From PBS's absolutely fascinating Silicon Valley program: Narr...
by Bakul Shah
Sat Jul 06, 2013 9:01 am
Forum: General discussion
Topic: code.org
Replies: 15
Views: 1469

Re: code.org

I have a different POV from Jim and Heater. To me coding is just another skill like reading, writing and arithmetic. Just as knowing arithmetic doesn't limit your career choice to being an accountant or a number theorist or an actuary, knowing coding doesn't mean you are limited to being a programme...
by Bakul Shah
Thu Jul 04, 2013 6:16 pm
Forum: Bare metal, Assembly language
Topic: chess in assembly!
Replies: 36
Views: 12396

Re: chess in assembly!

Very impressive! The assembly language program is easy to read -- very cleanly done (using equivalent C code as a comment is something I too use when writing asm code).

As your next assignment please add alpha-beta search so that you can pit a pi against a person or another pi.
Just kidding :-)
by Bakul Shah
Thu Jul 04, 2013 6:00 pm
Forum: General discussion
Topic: Setting hostname dymanically
Replies: 19
Views: 7769

Re: Setting hostname dymanically

4. I want one image to deploy to all pi's ... I am looking for a suggestion on how to set the hostname automatically to a unique value (i.e. MAC address or something else unique) so that all my Pi's don't have 'rpitc' as their hostname? Typically a DHCP server in your org's network gives a machine ...

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