Category Archives: Operating Systems

Oct
21
2018

Lenovo Tab 4 – 8

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For a number of years, I’ve been using an iPad Mini as a basic consumption device to catch up on the news and monitor my e-mail accounts.  Having used a “regular” early iPad, I wanted to be capable of updating the operating system but also having a lighter, smaller device that can easily be hand held.  However, using the Apple IOS operating system was very frustrating since there was no visible access to the IOS file system something I find very powerful with Windows, Linux, Raspian, and Android.  I never found it possible to move files from my home network to the iPad, nor save a (text) file to the network.  Yes it was possible via e-mail to and fro, but no clear cut (to me at least) way to exchange files.

My original iPad experience was at a conference several years ago.  I was using an iPad to take notes at the conference but at the end of the day…an inadvertent key stroke wiped out the entire day’s notes…and no way to recover them. (Lesson learned, in the days following,  I e-mailed about every hour, and I did manage to spend another day recreating the original “lost” notes).

So I evolved the big iPad to an iPad Mini to serve as a nice small consumption device.  But tired I grew of the lack of file exchange possibilities.  While searching Amazon, one of my favorite technology sites, I found a 10” Android-based device at a reasonably low cost – perhaps an opportunity to explore Android operating system.  Unfortunately the 10″ was really larger than I wanted for the functions intended, was an older, non-upgradeable version of Android, and would occasionally/frequently crash.  Fortunately, my financial investment in this 10” device was not significant.

Recognizing that Windows portable devices did not have the robust applications available to Android or IOS, a common complaint by many technology followers, I continued my search for a nice small device for consumption services (note: not a production machine).  And I found one on Amazon in the Lenovo Tab4-8…a device, approximately the size of the iPad Mini, but also with a more up-to-date OS version (which has been updated several times as new security patches were released).  The Tab4 is a 4th generation Lenovo tablet with an 8” form factor.

And of course the good news is Android has a visible file system, and there are applications that provide for the movement of files to/from external networks. In one experiment, I moved a big Excel spread sheet of my coin collection from my network to the Tab4-8 and was able to use it at a coin show to see my coin inventory; mission accomplished!

Using the nice hand-held 8” tablet and light weight was a turning point for this technology since it enabled me to put away those 11”x17” spread sheets and use a small 8” electronic device.  By putting it into airplane mode, the battery lasts a very long time yet still allows me to make functional use at the coin shows.

I recently took the Tab4-8 on an international trip…to preserve weight it was my only computing device.  It worked out just fine, I was able to track my e-mails, I learned how to move a few pictures from my camera to the Tab4 so I could do a small amount of edits/crops and send them to friends.  While the edits were limited, it served its purpose.  Also I could use the tablet on the airplanes since there are no cellular features (only WiFi and Bluetooth), but I tried to watch a movie I previously put on the tablet but I had limited success due to the size and table-top setting.  Another benefit –  the tablet fit nicely in my carry-on case.

Overall I like the Lenovo Tab4-8; my rating is 4 stars out of 5.

Pros:

  • It runs a fairly current version of Android, and is periodically updated with security patches.
  • It can run my favorite Firefox! Also Chrome browsers.
  • Expandable micro SD storage to make up for the small “disk” space typical in low cost devices.
  • There is a single micro USB port. Mostly used for power, it can also connect to devices such as a flash drives.  Leveraging a flash drive needs to change a setting to permit file access via the USB port (a good security practice).  Connector may be subject to breakage (e.g. plugged in for power, moving the tablet while reading content) although it does stand up well even after several accidental “pulls”.
  • No detectable speed/performance problems for my use, connectivity to WiFi seems good.
  • The Google Play Store has a lot of applications – often same/similar to IOS to cover a wide range of functional usage. Access to Word, Excel, and Powerpoint is available as are other office suite software.
  • Very nice sound system, surprisingly nice.
  • Nicely fits into a small carry on messenger bag.
  • Price, very reasonable.

Cons:

  • There is a single micro USB port. While used mostly for power, one cannot power the device and connect to external flash drives…one or the other.  Would be nice to have two ports.
  • The camera pictures leave a lot to be desired, especially in low light. Bright outside seems to work OK, but overall a poor camera.  (Not a big problem for me since I use a camera for pictures!).
  • Unlike the iPad Mini, the Lenovo Tab4-8 doesn’t have a magnetic closure sleep mode. Several of the cases that can safely house the Tab4 use magnetic closure, and the iPad for one senses the magnet and puts the device in sleep mode.
  • It would be nice to have more internal storage, but external microSD storage is a good alternative for “documents” but applications have to be on the internal storage.
  • The screen washes out in sunlight.

Note: Opinions expressed herein are those of the author. Any names/trademarks used are NOT an endorsement of those items…but are provided for reference only and are owned by their owner(s).

Jul
21
2015

The PiDP-8 – Recreating the PDP-8/i

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What is old is new again – this is the saga of the PiDP-8.

Back in the 1970s, I was in class and the speaker, I remember his name to this date, told us how he convinced the credit union to offer loans on computers so he could buy a Digital Equipment PDP-8 minicomputer for his personal use. Having used computers extensively in college, I was of course very much intrigued by the concept of a personal use computer…especially since I was developing systems using the Digital Equipment PDP-11 computer. But I couldn’t afford the PDP-8, and it wasn’t until 1975 that I first acquired my first personally owned computer – the Altair 8800.

Fast forward a few decades. I was listening to one of my favorite podcasts – Security Now with Steve Gibson and discovered his “attraction” to the PDP 8. Steve used the simple architecture of the PDP-8 to explain to audiences how computers work. During the same time frame, he mentioned his building a PDP-8 in conjunction with an effort by Bob Armstrong’s Spare Time Gizmos to assemble a kit, with custom panel, using a Harris/Intersil 6120 chip which “emulated” the PDP-8 architecture (see https://www.grc.com/pdp-8/pdp-8.htm). Unfortunately, I missed the opportunity to construct the SBC6120 and the heart of the project, the 6120 chip was in very short supply – so that door was closed.

In early May 2015, by chance I was again listening to a Security Now podcast and Steve just happened to mention a PiDP 8 kit that was being developed. Wow more PDP-8 developments.

The PiDP-8 is a project by Oscar Vermeulen that recreates a replica of the PDP-8/I front panel (all those nice lights and switches) but utilizes a Raspberry Pi and a program called SimH[1] to simulate the PDP-8…all for a few hundred dollars! WoW!

I followed Steve’s links and wound up at Oscar’s site Obsolescence Guaranteed, (http://obsolescence.wix.com/obsolescence#!pidp-8/cbie) and quickly signed up! Oscar replied to the sign-up by sending an update of the project’s progress and I started preparing by acquiring a Raspberry Pi A+ to run the project. I downloaded Oscar’s beta versions of SimH and began reviewing and preparing the kit construction directions. In the course of my delving into this exciting project, I quickly exchanged numerous e-mails with Oscar. One of the nice features of this project is the PDP-8 emulation is a part of SimH (which includes other computing platforms including the PDP-11) and what Oscar has done is to write some code to have the Raspberry Pi (any plus version including the Pi v2 which happens to run Windows 10 IoT) communicate with the switches and lights of his replica PDP-8/I panel. However SimH and the Pi do not need the panel to run the PDP-8 emulator which is seen via keyboard and display. This means that without the panel kit, setup, testing, and running the PDP-8 emulator is possible. I was having fun and learning a lot about the Pi, the Pi operating system, and SimH.

As things with the project progressed, Oscar and I exchanged e-mails several times a week. He was overwhelmed with requests for the PiDP-8/I panel kit and decided to split the “production” into two runs, a July run and a September run based on when one signed on to the project; I was in the second run.

I continued to prepare for the kit by leveraging Oscar’s writings and web pages and assemble a manual for me to use both in setting up the Pi with his beta code as well as the construction steps for building the PiDP-8. For me having a “printed” manual was easier than constructing the kit from web pages (and due to the quirks of web pages, it was not easy to just print the pages). This was also good preparation for me and helped me understand the software setup as well as the assembly of the kit.

As a courtesy to Oscar, I provided him with my suggestions as I walked through the steps. I also found some typographical errors and worked with Oscar to get them corrected. My working with the Pi and his setup instructions provided me with a much greater insight into the Pi and the Raspian Operating System…and this was really exciting.

Then in June, Oscar asked if I wanted to get an early kit and help assess the assembly steps. YES was my instant answer and on 9 July I got the shipment from Switzerland and carefully opened the package (about the size of a “standard” shoebox).

Even more than before, I was amazed at Oscar’s engineering skills in developing this PDP-8/I panel. The circuit board was high quality and the bamboo case, a standard 6” x 12” stackable organizer, a nice “green” touch.   His creating and crafting the kit and the components is on par with Heath Kit – different but on par. The ingenious approach to mounting the 26 switches on the panel is truly amazing and almost an engineering marvel. Brilliant.

As with the PDP-8 (and PDP-11 too) the panel has numerous switches and lights. The PDP-8 being an octal construct, the switches are grouped in threes with alternating colors in each group. In my preparation for painting the switches I had to locate the color Oscar called for…and it was hard…in fact impossible. It appears European and US paint stores operate differently. So I delved more into color and color systems than I ever imagined…and ultimately found a very close color equivalent – but it was quite a rewarding experience.

I’m now in the process of putting the finishing touches on the now working PiDP-8 at the same time as I’m installing the latest Windows 10 Insider Preview on several computers. At each step of the way I updated my manual and provided feedback to Oscar to help make sure the hundreds of kit builders can easily assemble their PiDP-8 kits. I’ll soon be delving into the PDP-8’s OS 8, enjoying the panel lights and switches, and learning more about the 1970’s technology that was the precursor to many computing developments. Thank You Oscar (and thank you Steve Gibson).

Overall I really like the PiDP-8 kit.  My rating for the PiDP-8 — 5 out of 5 stars.

[1] The Computer History Simulation Project, http://simh.trailing-edge.com/
May
13
2015

Microsoft’s Surface 3 (Initial Impressions)

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Just got a newly released Microsoft Surface 3 tablet which is next in line from the Surface 2.

The Surface 3 is slightly larger, uses a different power connection, and most important of all is an Intel platform vice an ARM platform.  For the first time, the “low” end Surface device can run any software from the x86 (and x64) software base.  In the old Surface 2, applications could only be loaded from the Windows Store…not bad, but running Firefox, Photoshop Elements, etc. were not available on the ARM-based Windows RT operating system.  Now, with the Surface 3, a full Windows 8.1 environment exists…and all my favorite software can run.

Once set up, I installed my favorite Firefox browser and a few other tools.  I took the Surface 3 on a trip recently and used it as time permitted.  One noticeable problem was with the TYPE keyboard…it appears the SPACE-bar doesn’t always respond to depressing the bar – especially at the very end of the bar.  It appears that there may be slightly too much flex in the bar and the two points of switch contact toward the center of the bar don’t receive enough “depress” to create the space character.  I’ll have to try some other TYPE keyboards to see if a similar problem exists…it didn’t on the Surface 2 with either the first or second generation Type keyboard.

Another interesting challenge is the power connection…the Surface 3 uses a micro USB.  This means it can only go in one way vice the two way alignment of the Surface 2 and Surface RT.  I am concerned that the USB plug could be damaged/broken if too much front/back pressure is applied by non-delicate handling.  Additionally, the Surface 2 used a 12v power brick with a more flexible wire…since the Surface 3 uses a 5 volt (actually 5.2 volt) power at higher current, the wire size is larger and consequently stiffer.  This is a challenge in wire handling and storage.

The Surface 2 came with the full suite of Office installed.  Surface 3 comes with a year’s free Office 365.  Nice, but after a year, an additional $70 or so will be needed for another year’s subscription…considering Home and Student is about $140 and it works for multiple years…the perceived “cost” of the Surface 3 is significantly more than the Surface 2.

In general, I like the Surface devices and don’t need the powerhouse of the Surface PRO line.  The Surface 2 was a very good device, small, lightweight, and very functional.  It appears the Surface 3 is the same and even better in that I can load some software I really like.

Best deal in town…I pre-ordered the COSTCO package…Surface 3, black type keyboard, pen…savings over $80.  Loss of color of keyboard and pen, but no big deal considering the savings.

 Overall I like the Surface 3.  My rating for the Microsoft Surface 3 — 4 out of 5 stars.

Pros:

  • It runs Windows 8.1 software…yea!
  • It can run my favorite Firefox!
  • Pen capable (I haven’t tried it yet)
  • Expandable micro SD storage
  • No detectable speed/performance problems for my use

Cons:

  • Type keyboard SPACE-bar is a challenge to composing any material without paying attention to space character insertion
  • USB power connection may be subject to breakage, and the stiffer wire doesn’t afford the flexibility of previous Surface devices.

Note: Any names/trademarks used are NOT an endorsement of those items…but are provided for reference only and are owned by their owner.

Feb
19
2015

Raspberry Pi 2 model B

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Today was the day I received the latest Raspberry Pi, the version 2, model B.  This version is a significant upgrade from the version 2, model B+ with a 4 core processor and 1GB of memory.  Same footprint as the v1 B+ so all the cases that accommodate the B+ will also accommodate the new version 2.  And the speed is notable over my original v1 B (256mB memory, single core processor).

All storage on the low cost Raspberry Pi is via an SD or micro SD card (the original was an SD card, the B+ version changed to microSD and is retained for the v2 B).  So it is somewhat slow, but very acceptable.

Using a concept called NOOBS (New Out of the Box System), one can choose which of several operating systems to install on the microSD card.  I chose the Raspbian Operating System, a Debian Wheezy variant.

Setup is fairly easy…put the Raspberry Pi in a case for protection, connect keyboard and mouse to the USB ports, connect a display via the HDMI port, and connect power.  Networking via a cable is available too, or one can use a USB plug-in for Wi-Fi.  All-in-all for $35 for the Pi (add for shipping), about $8 to $20 for a case, and a few dollars for the microSD (8BG probably the minimum) and you’re ready to start.

Using the network connection, I installed a LAMP stack, and after struggling with learning Linux commands (again), the web site was up and running as the test files demonstrated.

Microsoft is indicating that a version of Windows 10 will be made available soon for the Pi v2 for developers/makers to develop under the Internet-Of-Things umbrella.  and I wouldn’t be surprised if Microsoft gave away the Pi to attendees at the Build Conference coming up in late April.

I ordered my Pi from Newark Electronics and the other items from Amazon.  The Pi took about 2+ weeks to arrive since I ordered it on the first day of release thanks to trade press announcements.  Although Pi production moved to the UK shortly after the original design, the box of the new Pi 2 said “Made in the PRC”.

CASE: From a variety of cases available on Amazon I selected the FLIRC case.  Basically a case metalic shell with plastic bottom and a nice top.  While not transparent like some of the plastic cases, it is really nice.  A little expensive at about $19 than the $8 plastic cases, but it is very nice looking and helps dissipate any heat build up. (Note: I originally paid $13 for the case and over the two weeks Amazon moved the price to $17 then to $19, back to $17, and back to $19). My rating for the FLIRC case design for Raspberry Pi 2 — 5 out of 5 stars.

HDMI to VGA:  To use a conventional LCD monitor, the video needs to convert the HDMI to VGA, I’m using a dongle from Ableconn (about $18).  Easy to connect to the VGA cable and mate the HDMI end on the Pi. My rating for the Ablecon dongle for Raspberry Pi 2 — 5 out of 5 stars.

Wi-Fi: Although the Pi has a 10/100 ethernet port, I wanted to “cut the cord” so I can play with the Pi anyplace in the house.  The Edimax small footprint wi-fi plug-in appeared in many pictures of the various Pi projects.  So I gave it a try (about $9) and have NOT been disappointed.  With the 4 USB ports on the Pi it doesn’t consume a lot of space (in the original Pi, there were only 2 USB ports, the B+ and now v2 B have 4 ports). My rating for the Edimax wi-fi dongle for Raspberry Pi 2 — 5 out of 5 stars.

Operating System: As mentioned, I’m using Raspbian Linux, a Debian variant. It has the various Linux components one needs to begin immediately, but Linux itself requires some discipline and it is different from Windows such as case sensitivity for file names and folders.  Also, the default web browser doesn’t display sites the same way as other browsers display the same page.    My rating for the Raspian OS for Raspberry Pi 2 — 4 out of 5 stars.

Pros:

  • Really small foot print!
  • Much improved capability especially memory and speed
  • Easy to install operating system
  • VERY cost effective, about $35
  • The Pi is intended to help stimulate learning about computer technology and it clearly enables this vision
  • A future capability to run a variant of Windows 10…awesome

Cons:

  • Linux, in general, requires somewhat more skills and discipline than people may be used to
  • In spite of the hardware upgrades, performance is still a little slow, especially when editing and loading web pages in the browser…acceptable yes, but a little slow

Overall rating for the Raspberry Pi 2 — 4 out of 5 stars; overall cost effectiveness of the Raspberry Pi 2 — 5 out of 5 stars.

Note: Any names/trademarks used are NOT an endorsement of those items…but are provided for reference only and are owned by their owner.

Additional Note: This Blog post was written on the Raspberry Pi v2 model B.

Feb
17
2015

An iPad Tale

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Several years ago, in my role as an Enterprise Architect, we began to see a demand from various business components to leverage use of the growing popularity of Apple’s iPad in another example of consumer driven IT.  At the same time, Apple started to introduce the iPad2 making the iPad1 available at a discount.  Additionally, leveraging an additional discount for a refurbished model, I acquired an iPad1.

And so began my discovery of iPad technology.  I used the iPad as a note taking platform during several conferences and discovered some of the quirks of the Apple IOS operating system.  Unlike Windows and even the Android platforms, IOS does not have a visible file structure!  I did not realize this until I was at a conference taking notes with the iPad note application…a full day’s notes were instantly vaporized with some keystroke sequence I accidentally activated. Up until that time, I was sending the notes back home via e-mail (apparently the only way to preserve them) at the end of the day…lesson learned, do it hourly! (I believe you can also deposit the contents in Dropbox, but I’m not a big user of this service).

As I learned more about the iPad technology I configured it with various news applications as well as the solitaire application.  It served me well as a browser to catch up with the morning news, to pass the time.  At some point, my e-mail settings got lost and while I was able to read my e-mails, I could not send any…not much of a loss for my use.

As time goes on, Apple upgraded the IOS operating system from v5 to versions 7 and 8.  However, the iPad1 was limited to version 5.x.  As Apple introduced newer versions of the iPad and other IOS devices, applications began to leverage new capabilities of IOS especially v7.x.  Applications on the iPad1 gradually became obsolete and could no longer be upgraded.  Also, applications often crashed the operating system, especially with embedded content using pictures…in essence, my iPad1 was doing its equivalent to a “blue screen of death.”

Wanting to keep somewhat current with iPad-like technology, I sought out newer options.  First off, it had to run IOS v7 or v8.  I didn’t need all the latest features, and I wanted to manage the cost.  Apple had introduced the iPad Mini and currently has 3 generations of such.  I looked at both the iPad Mini 3 and the iPad Mini 2.  I found the screen size acceptible and the high resolution of the screen (“retina”) was nice.  I didn’t need the regular sized iPad (9″) and the smaller Mini was workable for my needs.  I settled on the iPad Mini 2, searched for refurbished or sale and found a good price at a local Microcenter computer store.

IOS hasn’t changed in some functionality limitations I’ve seen before – no visible file system.  But the smaller sized iPad Mini 2 was easy to carry, held its battery charge reasonably well, my applications ported over easy.  Additionally I was able to set up the e-mail accounts, so my reading e-mails was maintained…but in addition, I figured out how to sent e-mails although the iPad is not my primary approach to sending e-mails.

As with my previous iPad1 note taking, the ability to take notes with some formatting – like bullets – is not possible; one must use various manual characters to simulate bullets (such as a “*”), then e-mail the content, then copy into a more suitable word processor.

Pros:

  • Small size…can sometimes fit in a big pants pocked.
  • Cloud file storage available … Apple cloud and applications for Microsoft One Drive.
  • Screen resolution really good.
  • Application ecosystem very good…some nice utilities not readily available in other ecosystems.
  • Suitable for a consumption device

Cons:

  • IOS continues to frustrate with no file visibility
  • Cannot see local network attached storage/file systems
  • Pictures from the camera have to be e-mailed vice just moved to storage (I believe it can be moved to Apple’s cloud, but it cannot be moved to One Drive; I shun having to have a Microsoft Cloud,  Apple Cloud, Dropbox, Box, and an Android Cloud to use the various operating systems and features)
  • Printing on home-bound printers not easy (I haven’t mastered it yet…not sure it is possible)
  • Not really suitable for anything other than a consumption device; limited note-taking is possible.

Overall rating for the iPad Mini 2 — 1 out of 5 stars.

 

Note: Any names/trademarks used are NOT an endorsement of those items...but are provided for reference only and are owned by their owner.

Feb
15
2015

Lenovo Thinkpad 11e (Part 2 – Chrome Operating System

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Note:  In any assessment of operating systems and application suites. YOUR functional use is the most important factor.  Some people need high performance, some don’t; some people need sophisticated applications, some can easily use simple applications;.  It all depends on one’s needs.  These products are viewed from the perspective of my usage and needs.

I’ve used the Lenovo Thinkpad 11e for several months now and continue to like the platform itself.  However, I don’t fully enjoy (appreciate) the Chrome Operating System for my needs.  I need to emphasize that my opinion of Chrome is as it applies to my specific use and needs, not the totality of the operating system.

First off, one must be connected to the Internet and logged into Google to make good use of the Chrome OS it is a browser-based operation including the multitude of applications available via the Google Store.  So if you’re in an area where no network connection is available, all that hardware you’re tugging around is non-functional since all the applications leverage the Chrome Browser (which by itself is not bad and definitely better than most versions of Internet Explorer I’ve used); and of course any browser requires Internet connectivity.

Unlike the Apple IOS, Chrome does a visible file system and permits storage of files locally or in the Google cloud.   While connectivity to other clouds – such as Microsoft’s OneDrive – is possible, operating on a document in OneDrive requires moving that file locally or to the Google Cloud in order to operate on it.

Applications for the ChromeOS are somewhat limited.  When compared with the applications available for the Android operating system, the number/kinds of applications available for the Chrome OS are limited – although a few “local” utilities are available.

Even with network connectivity to the Internet at home, I have not found it possible to access files stored on local network attached storage.

Additionally, I haven’t been able to print documents on my network connected printers (haven’t tried locally connected printer either).  Supposedly there is a way to connect to your home printers if they are connected to the Internet via a Google Cloud Printing service — but so far it seems too complicated and I have not evaluated the security implications.

Pros:

  • Small foot print
  • Local and Cloud file storage
  • File visibility
  • Suitable functionality for browsing and simple office-style operations (word processing, spread sheets, presentations).
  • Given its limits, it makes “corruption” of the environment much, much harder to accomplish, providing a safer environment from maltreatment. (probably why a greater acceptance in the education community)

Cons:

  • Requires connection to the Internet for almost all functional use.
  • Limited application suite as compared with other operating systems
  • Printing on home-bound printers not easy
  • Difficult to move files to home-based network accessible storage

Overall rating for the Chrome Operating System — 2 out of 5 stars.