Saturday, June 7, 2014

 

Using Less Memory


In an effort to make older computers more viable one must consider ways of
using less memory. One of the most effective changes I've made on my
quasi-old P3 system running vector linux was to switch from KDE 3.5.10
to IceWM. For memory KDE 3.5.10 needs roughly 41 megs and the much lighter IceWM
only uses 4.5 megs of memory. That's a significant memory savings but there are
other advantages as well.

Web browsing and even games were found to be more responsive after the switch
to IceWM.

Kmail was replaced by using Gmail and the text-based email client mutt.
The scanning program Kooka has been replaced by xscanimage as Kooka doesn't
work with newer Linux systems using libusb.

The idea of using Trinity or XFCE as a way of using less memory is only
effective if switching from KDE 4 or Unity, both of which are memory pigs.
IceWM has a far smaller memory footprint and a better cost/benefits ratio.

I still use some parts of KDE 3.5.10, mainly klipper, kmix and konsole.

Unload kernel modules which are not needed, for example:
sudo /sbin/modprobe -r bluetooth

Repeated information requests can be automated using links or wget, and both
of these use far less memory than firefox.

links can be used in scripts for quick stock checks: (where $1 is the stock identifier)

links "http://www.google.ca/finance?client=ob&q="$1

Generally text based programs use far less memory compared to their graphical
counterparts.

In many ways firefox is one of the biggest memory pigs of them all and dillo is
my first choice among light web browsers that use X. The main problem with dillo is
it can not handle https and javascript. Assuming one does not need either of those things
then dillo is quite suitable as a web browser. Also when the computer is unattended
I always exit from firefox so that it doesn't consume any cpu time which can be
very high if the web page you are on as flash based ads!

Killing defunct processes and their parent processes will also help to free up
memory. It is worth it to periodically check for dead processes.

Saturday, March 8, 2014

 

Pollution Caused by Chip Fabrication

It is a sobering fact that the chip fabrication industry which is so vital to our modern society is also the cause of a lot of pollution. This unglamorous topic doesn't get much media attention. No one wants to be reminded that the hi-tech world of computers isn't possible without the use of a lot of caustic chemicals.

To summarize, some of the items used in the various processes of chip fabrication include: Acetone, Arsenic, Arsine, Benzene, Cadium, Hydrochloric acid, Lead, Methyl chloroform, Toluene and Trichloroethylene. More details on these items can be found here: Environmental Impact.

The cost of cleaning up contaminated soil was one of the reasons why Commodore Semiconductor Group went out of business. More information on this can be found at the EPA site but suffice to say that groundwater in Norristown Pennsylvania was contaminated with high levels of trichloroethylene. This also led to the eventual demise of Commodore Computers. 

This leads me to propose the idea of using older computers as long as possible instead of continually buying new computers. For the last 10 years I have done this, although initially it was more of a cost saving measure. My computer philosophy has shifted towards the idea of 'computer minimalism'. I've already remarked on the longevity of certain computer models, including ones using the Pentium 3 coppermine CPU.

To apply the idea of minimalism to computers we must select an operating system that is efficient and adjustable. My short-list of possible operating systems for minimal computing include: OpenBSD, Vector Linux Classic, and Fedora Core 1. One might be a bit surprised to see FC1 on that list due to its (relative) old age, but I must admit to a certain amount of inclusionism in my philosophy on computers. One could conceive of examples of far greater levels of minimalism but I wanted to be able to at least do mundane things like running a web browser and web server.

Thus we could fix or at least reduce the problem of the pollution caused by chip fabrication by buying or fixing up old computers that have already been manufactured. Naturally we would select old computers that are the most easily repairable and have a ready supply of replacement parts available. One example of a computer that fits this desciption is the IBM Personal Computer 300GL (slot 1, p3 running at 400 mhz).

Saturday, January 11, 2014

 

DNS Propagation and Disappearing Services

I had to change the nameservers on a few of my domains. Formerly I was using the free service of dnsever to supply nameservers for my domains. This stopped working yesterday. It's an unfortunate reality that free internet services disappear, or cease to be free.

Since I have more than one domain pointing to my server it's still possible to access cubeman.org via the maxhost.org domain. Eventually the new dns records should propagate within 24 to 48 hours and things should be back to normal in a day or two.

It's been a bit of a battle keeping web services running. The now infamous ice storm which began in Dec. 22nd, 2013 disrupted power and telephone lines through much of Ontario. One of my phone lines stopped working, but it wasn't too bad as it was restored in a couple of days. Also I experienced two power failures of about 5 hours and 2 hours respectively. My UPS's kept the computers going for half an hour each time but it's clear that I need a longer lasting UPS than that.

Sunday, September 15, 2013

 

CBC changes radio links again

Just a quick note to say that CBC has changed their direct radio links once again, here is the new link:

http://www.cbc.ca/listen/includes/directr1.html

Saturday, August 3, 2013

 

2.11BSD Unix on PDP-11/73


Sunday, July 7, 2013

 

Computers and Operating System Bundling

In reviewing the history of computer sales in the 'modern era' we can see an interesting pattern. Early on we saw home computers which booted directly into ROM BASIC and booting into another operating system isn't even possible. Later on we see many examples of the CP/M operating system being bundled with z80 based computers. CP/M was usually bundled as one needs a unique BIOS for each type of computer. In a rare exception Radio Shack sold CP/M separately for their Model 4 machine for $150 in 1985.

Upon the release of the IBM PC we find that IBM offered three different operating systems for their machine: PC DOS, CP/M-86 and UCSD Pascal. Of these 3 operating systems PC DOS becomes the operating system of choice for most users. Even in this early era we can see that computer users had some different choices of OS.

By 1985 we see the rise of the IBM compatible computer and the near ubiquity of the x86 cpu architecture. Of course soon after this we see various Motorola 68000 based systems, including the ones offered by Commodore, Atari and Sharp. One constant we continue to see is that most operating systems are closed source although we see in academia that Universities have some access to the Unix v6 and v7 source code. The idea of bundling an open source operating system with a computer doesn't occur until much later. In 1987 we see the release of the open source MINIX OS.

In the 1990's we see the appearance of BeOS which is offered for free to various OEMs. Kuro5hin.org has an excellent blog post to explain how Microsoft suppresses the use of BeOS by OEMs. BeOS lives on in an open source implementation called Haiku.

With the increased use and speed improvements of the internet we see a new phenomenon: open source operating systems are distributed via downloading. This includes operating systems such as GNU/Linux, the BSDs, Haiku, Plan 9, Inferno, AROS and many others. By 2008 the Jiangsu Lemote Tech Co releases the Lemote computer with Linux and PMON, a completely open source system.


Thursday, June 20, 2013

 

Early History of Microcomputers


This page is powered by Blogger. Isn't yours?

Subscribe to Posts [Atom]