Binary Lesson 13 – Signed Binary

lesson13If we can express signed values, such as +5 and -5, in decimal, can we do so in binary? Indeed we can!

Signed numbers are either positive or negative in value. If the number is preceded by a minus sign, then the number is negative. If no sign is present or if the number is preceded by a plus sign, then the number is positive.

-5     Negative 5
+5     Positive 5
5      Positive 5 (+ symbol omitted)
-100   Negative 100
8      Positive 8

(The value zero has no sign because nothing is nothing. Therefore, +0 and -0 are pointless.)

We can express signed numbers in binary in the same way, but there are a few points to be aware of to ensure correct mathematical results.

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Ubuntu Family 14.10 Released

October 23, 2014

ugnome2It’s that time of the half-year again when the next version of the Ubuntu-based distributions is released.

Today (October 23, 2014) Ubuntu, Xubuntu, Kubuntu, Ubuntu GNOME, and others have been released in their official 14.10 non-beta versions.

 

 

 

Ubuntu GNOME 14.10 running perfectly in VirtualBox 4.3.18. Runs better after installing the VirtualBox Guest Additions. As always, the first thing to do is peruse the default wallpapers and become oriented with the operating system.

Ubuntu GNOME 14.10 running perfectly in VirtualBox 4.3.18. Runs better after installing the VirtualBox Guest Additions. As always, the first thing to do is peruse the default wallpapers and become oriented with the operating system.

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Binary Lesson 12 – One’s Complement and Two’s Complement

October 13, 2014

lesson12One’s complement and two’s complement are two important binary concepts. Two’s complement is especially important because it allows us to represent signed numbers in binary, and one’s complement is the interim step to finding the two’s complement.

Two’s complement also provides an easier way to subtract numbers using addition instead of using the longer, more involving subtraction method discussed in Lesson 10.

We will save the two’s complement subtraction for another lesson, but here, we will look at what these terms mean and how to calculate them.

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Samsung EVO 64 GB Micro SD and the 128 GB Memory Stick Pro Duo Adapter

evo1A while back I gave my impressions about using two SanDisk 64 GB microSD cards in a dual-micro SD adapter to produce a single 128 GB Memory Stick Duo for Sony devices.

This 128 GB arrangement continues to work superbly despite the slow transfer rates limited by the dual-micro SD adapter.

Since then, Samsung has introduced the Samsung 64 GB EVO microSDXC card that is supposed to offer faster transfer rates and increased durability.

Does it? Here are my thoughts based upon my usage.

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Binary Lesson 11 – Binary Multiplication

September 25, 2014
lesson11Binary multiplication is performed the same as decimal multiplication. The numbers we are multiplying together are called factors, and the result of multiplication is called the product.

The only challenge comes from multi-row addition, which is facilitated if we perform the addition two rows at a time.
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Binary Lesson 10 – Binary Subtraction: Longhand

September 22, 2014

lesson10We can subtract one number from another in binary to obtain a binary difference. Numbers are subtracted in the same way as in decimal, though borrowing requires some explanation.

There is more than one way to perform binary subtraction, and in this lesson, we will focus on the longhand method in order to understand the process.
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Unable to Update Linux Due to Problem With MergeList Error

September 18, 2014

mergelistDuring a recent attempt to update Linux Mint and Xubuntu, I ran into an issue that I had never seen before.

Ubuntu Software System and Synaptic would both close immediately. No system updates or software installations or removals could be performed even though the system ran fine.

Attempting to update from the terminal also returned a wealth of errors that always reported a Problem with MergeList error.

Update September 24, 2014: This issue has apparently been fixed after performing a recent system update. Several programs, including apt-utils, have been updated in the repository, and the MergeList and Hash Sum mismatch problems no longer occur. The cause of this problem was most likely a software issue that has now been corrected.

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