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Quorten Blog 1

First blog for all Quorten's blog-like writings

Many commentators have touted the Internet of Things as being the next big revolution in terms of the total number of computers, exceeding that of the whole body of modern mobile devices today, smartphones and tablet computers. That is true. However, there is an implicit message contained in such statements that is not true.

It has been understood that smartphones have tremendously eclipsed the sales of desktops and laptops, not just in number of units sold, but also in tons of hardware sold annually and annual revenue in U.S. dollars. Similarly, people spend enough time accessing the Internet on mobile devices such that the total network traffic coming from such devices rivals that of desktops and laptops. Essentially, not only do the number of mobile devices eclipse that of desktops and laptops, but also the revenue and Internet traffic eclipses that of desktops and laptops.

Read on →

As I’ve noted earlier, only a subset of software has become immensely popular in modern computing; namely, the software required to connect to the Internet.

As much as I like having a diverse array of local software with useful features and functions, I need to get this fact straight with myself. Ultimately, all such software is specialist or toy software compared to the body of software and equipment for connecting to the Internet and browsing the Internet. The user community for merely connecting to the Internet and doing the rest of work from there it is huge, such that their needs would surely trump those of the specialist users if you had to make a decision to provision a computer system limited resources available, yet for a large number of users.

Now, how does AI relate to this picture? Don’t you want to have a local AI on your system too? Only if it has a web API for your browser. Otherwise, it might as well be done over the Internet as an application on a remote computer.

History of Quorten Blog 1

2018-05-14

Categories: blogging  
Tags: blogging  

Quorten Blog 1 started out as mere text files written in a quasi-Markdown syntax, originally not available online. Actually, most of the text came from only two huge text files. With the help of some automated conversion tools, these notes were brought into the 21st century in blog form. Incidentally, many of my notes were summaries of information that came from existing blogs, but sure, you know the way the web works… more redundant information in slightly different forms always improves the quality of search engine results.

The imported posts encompass most of my previously written tech notes in terms of volume. Although there will be more older notes to come, most of them will be fairly small compared to the initial import.

Read on →

First post!

2018-05-13

Categories: blogging  
Tags: blogging  

This is the first blog article post to my blog. I hope this turns out correctly and is formatted nicely for blog use. If so, I can continue to bring in all the other articles I have.

  1. Reformat to Markdown.
  2. Find out approximate dates if exact dates are not specified.

Okay, so for some reason, when I was searching for information on 12 V power supplies that you can connect multiple 12 V devices to a single power supply, I found these really great and useful sources, but because they were all about PC power supplies and not the more general topic, I scrapped them and failed to save them the first time through. So, now I go backwards in time to search for what I’ve found previously and note this article down again.

So, the question, can you connect multiple 12 V devices to a single 12 V power supply? In general, yes, so long as your power supply can provide adequate current. PC power supplies in particular may have relatively high current requirements and will use multiple power supply rails with separate current limiters in order to comply with the safety standard IED 60950. Sometimes there may even be separate switching regulators to help with noise isolation. This website also has lots of great information about PC power supplies in general. A PC power supply has 12 V, 5 V, and 3.3 V outputs.

20180512/http://www.playtool.com/pages/psumultirail/multirails.html
20180512/http://www.playtool.com/pages/psurailhistory/rails.html

So, yes, in general, for low current, you can connect multiple 12 V devices to a single 12 V power supply.

Read on →

The rules of the home network as stated:

  • The home network must be totally libre. That is, anyone can set up their own devices in any way they please on the network, so long as it does not interfere with the rest of the network.

    • If someone wants their own DHCP/DNS server, they can setup their own NAT to do that.

    • Likewise, everyone gets unimpeded Internet access. Standard firewall configurations are used on the router.

    • If anyone needs special firewall configuration, they can get that with ease, thanks to our libre software router.

  • Anyone can learn how the home network works.

  • There exists a local dedicated home server that anyone can use, so long as they share the resource fairly.

  • The dedicated home server provides a local, shared repository of libre software that anyone can use.

  • Anyone who asks to have direct access to the router/server and obeys system administration best practices can have it.

Read on →

Failed search.

Is there a device you can buy that can supply power to multiple 12 V DC devices? Maybe, but it’s hard to find.

20180511/DuckDuckGo 12 v dc power supply to multiple devices 20180511/https://electronics.stackexchange.com/questions/245689/multiple-12v-devices-with-one-power-supply

This is an interesting site.

20180511/https://www.circuitlab.com/

This site has way too many advertisements.

20180511/https://www.edaboard.com/showthread.php?194820-12v-dc-power-supply-with-multiple-devices 20180511/https://electronics.stackexchange.com/questions/149931/does-it-make-sense-to-power-multiple-12v-devices-from-one-single-power-source

Only “universal” power supplies with one voltage output are being advertised.

20180511/https://www.amazon.com/slp/multiple-device-power-supply/sstkwu2sofcf4jp

UPDATE 2019-12-04: See my next blog post for the answer, which is simply “yes” for low-current applications.

Important! LINK.

This is what a wire-OR gate is. No, it’s not just wire together, the official circuit uses diodes to prevent signal back-flow, and a pull-down resistor to keep the voltage/current regulated.

JJJ TODO LINK with DTL and RTL articles.

20180508/DuckDuckGo wire-OR
20180508/https://en.wikipedia.org/wiki/Wired_logic_connection

Important! For GPIO on the Raspberry Pi. Wondering where the names pull-up and pull-down for the GPIO state configuration are derived? Look here, this is the reason why.

20180508/https://en.wikipedia.org/wiki/Pull-up_resistor

  • Of course, as many commentators have stated on this, modern users are far displaced from the concept of pull-up and pull-down.

Important! Raspberry Pi notes. So, the solution for your reusable connection woes? Use JST connectors for many components. This will ease a lot of things.

Oh, also you can make your own printed circuit boards if that will help.

20180503/https://en.wikipedia.org/wiki/JST_connector
20180503/DuckDuckGo raspberry pi jst connector
20180503/https://www.reddit.com/r/raspberry_pi/comments/4tuwao/how_to_connect_raspberry_pi_to_jst_4pin_connector/
20180503/https://www.adafruit.com/product/3422
20180503/https://www.adafruit.com/product/1152

UPDATE 2019-12-04: I have decided that Molex PicoBlade is better because it is more common and it doesn’t lock so tightly that it is difficult to remove.

20180430/DuckDuckGo microsd cost trend

The industry has moved a very long way over the last 40 years, but I need not mention this to anyone who’s involved in semiconductors. In 1978 a Silicon Valley home cost about $100,000, or about the cost of a gigabyte of DRAM. Today, 40 years later, the average Silicon Valley home costs about $1 million and a gigabyte of DRAM costs about $7.

20180430/http://thememoryguy.com/category/memory-markets/price-trends-forecasts/
20180430/http://thememoryguy.com/storage-memory-hierarchy-40-years-ago/
20180430/http://thememoryguy.com/wafer-shortages-and-dram-nand/
20180430/http://thememoryguy.com/putting-dram-prices-in-perspective/

Unfortunately, I must say that it is very hard to find information on this subject. Sure, the prices are going down, just maybe not as impressively as you would like.

20180430/https://www.trendforce.com/price/flash
20180430/https://www.dramexchange.com/Intelligence/
20180430/https://www.themarketreports.com/report/global-microsd-industry-market-research-2018

Important! Not all smartphones have MicroSD card support, i.e. newer iPhones. And iPads.

20180430/https://www.digitaltrends.com/mobile/best-microsd-cards/
20180430/http://www.tested.com/tech/photography/456861-why-it-sometimes-makes-sense-buy-microsd-instead-full-size/