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Published: 2017-03-25T03:55-07:00


Historical IBM Microcomputer Hardware/Software LAN Products

Mon, 20 Mar 2017 21:55:56 GMT

The concept of an overarching connectivity architecture such as SAA was one approach to managing these compromises. One clearly evident (if not explicitly stated) IBM strategy in managing outside competition was to coopt popular technology.

Systems Application Architecture (SAA) Part 2

Sun, 19 Mar 2017 19:32:38 GMT

The only session service protocol family supported in the initial announcement was LU 6.2. As I have noted in previous posts, LU 6.2 is a program-to-program communication protocol.

Systems Application Architecture (SAA) Part 1

Tue, 14 Mar 2017 23:44:53 GMT

Common communications support was designed to interconnect SAA applications, systems, networks, and devices.

WikiLeaks and the Reality of US Cybersecurity Capabilities

Tue, 14 Mar 2017 23:31:00 GMT

Who watches the watchers? I do.

Advance Program-to-Program Communication (APPC) and LU 6.2 Part 2

Tue, 14 Mar 2017 00:57:19 GMT

Another addition to APPC-related products was advanced peer-to-peer networking (APPN), which was an extension to SNA. APPN featured:

Advance Program-to-Program Communication (APPC) and LU 6.2 Part 1

Sun, 12 Mar 2017 23:30:13 GMT

Technically, processor in this context means an execution environment supplied by a Logical Unit. Facilities are furnished for LU-to-LU and LU-to-SSCP conversations.

The Impacts of IBM's SNA Networking on LANs Part 5

Sun, 12 Mar 2017 23:19:27 GMT

PU-T2.1 was defined in 1983 and is designed for peer-to-peer coupling (for PCs, for example) or subarea routing. The former is, in principle, nonmediated?that is, it is not necessary for routing through VTAM or NCP, although two PCs communicating with one another through different SNA cluster controllers will probably have to pass through the Communications FEP.

The Impacts of IBM's SNA Networking on LANs Part 4

Thu, 09 Mar 2017 22:22:14 GMT

Support for resource sharing is particularly important since in a modern data communications network one primary objective is (or should be) extensive connectivity among end-users and devices.

The Impacts of IBM's SNA Networking on LANs Part 3

Thu, 09 Mar 2017 22:18:53 GMT

SNA is a layered architecture similar to the International Standards Organization's Open Systems Interconnection (OSI) model. SNA proper is divided into only five (not seven) layers?End User and Physical layers are not part of the formal scope of SNA.

Felon enabled to breach sensitive data?

Sat, 04 Mar 2017 14:30:03 GMT

A Washington, D.C. contractor apparently allowed a convicted felon to access PII and PHI, resulting in a breach.

Are the optional programs really optional?

Tue, 28 Feb 2017 14:58:24 GMT

For a long time, I wanted the meanest and leanest Linux computing machine I could ever have. So much so that I went through Linux from scratch and used Gentoo for many years all in the effort of having my precious CPU cycles used to the best and most effective way possible and my hard disk is as free as possible for all the cat videos I would ever want to watch.


In that

Have I finally found my perfect Linux, conclusion.

Tue, 28 Feb 2017 13:59:08 GMT

In the previous article or random rumination, take your pick. I mentioned that I have used Gentoo for many years however, I decided that I had had enough of the time taken to compile large programs such as Chrome and LibreOffice in order to keep them updated. Especially when pre-compiled distributions do the same updating chores in a fraction of the time, minutes instead of hours.



Have I finally found my perfect Linux?

Tue, 28 Feb 2017 13:29:46 GMT

Getting close to the present situation in my trip down the nostalgia of memory lane ( am I getting old that I feel the need to ruminate on past good old days?). I last mentioned that I used Gentoo for many years.


There are many reasons I liked Gentoo. It is the ultimate in customisable Linux distributions and you can have it configured exactly how you wish. In other words,

Packing my priorities.

Mon, 27 Feb 2017 15:33:37 GMT

I would have to say that the heart of a Linux distribution is its package management system. There are a few around however the two most popular ones are the RPM and dpkg which are what RedHat and Debian use respectively.


I know RPM extremely well. When I was going through my Linux from scratch phase I actually created my own RPM packages for all the programs in that

Hopping along the byte busway

Mon, 27 Feb 2017 15:09:06 GMT

The biggest difference between Linux and other proprietary operating systems is that there is so much to choose from. If you get a Windows based computer then you get Windows. It will look exactly the same as every other Windows computer and perform exactly the same way as well.


If you were to buy an Apple based computer then you will get the Apple developed operating system

Enlightenment starts to dim.

Mon, 27 Feb 2017 14:11:43 GMT

As I mentioned before Enlightenment was what really got me in the mood to take Linux seriously and by far it is the best value for cpu cycles in terms of graphics bang for the bit bucket buck.


The best thing about Enlightenment is that it is so configurable and you can have more special effects going on with it that Windows could never match until they brought out Vista. We

Window shopping

Mon, 27 Feb 2017 05:13:29 GMT

As I mentioned in the previous article I fell in love with the KDE window managing system. I say window managing system however, it is actually a lot more. A whole ecosystem or environment of programs so to speak.


So I stuck with KDE for a long while and turned up my nose at anything else. I even became evangelistic about it and recommended using the desktop environment in

The Kool Desktop Environment

Sun, 26 Feb 2017 15:49:13 GMT

When I first started this trip down memory lane I mentioned that the window manager of the first Linux distribution I tried was really not that good. It seemed windows like yet was different enough to be confusing and offputting. Sort of like the uncanny valley of window managers instead of robots.


What really got me hooked into Linux was the Enlightenment windowing manager

The memory lane continues

Sun, 26 Feb 2017 15:20:08 GMT

In my previous nostalgic ramblings I mentioned the first time I tried to use Linux, and failed. As they say in the stories, some time passed. This time I was doing some programming work for a company and this work was based on the Unix operating system.


At the same time I was also programming on a Windows computer and unfortunately, as it was a work computer, I was having

A trip down memory lane.

Sun, 26 Feb 2017 14:38:13 GMT

I can remember the first time I tried Linux. The reason I wanted to try Linux was that I had heard about it and I wanted to find an alternative to the relatively new Windows XP which I did not want to use.


By relatively new I meant that Windows XP had been out for a while, at least a year or two yet I was still hanging on to the best Windows operating system ever and that

When does security hamper productivity

Sat, 25 Feb 2017 09:45:45 GMT

We all should consider IT security in our daily activities. ... However like everything else there is a line where too much of a good thing becomes bad.

The Impacts of IBM's SNA Networking on LANs Part 2

Thu, 16 Feb 2017 21:52:40 GMT

IBM did not, for the most part, sell SNA as a generalized networking solution independent of its own product line. It was designed to be a networking solution primarily revolving around an information environment that has IBM-designed large or mid-range computers at the center.

The Impacts of IBM's SNA Networking on LANs Part 1

Thu, 16 Feb 2017 21:38:40 GMT

IBM also supported a wide variety of other software interfaces, as well, including IEEE's Logical Link Control (LLC). In addition, IBM sold a number of Ethernet (802.3) related products during this time as a hedge.

The Domination of TCP/IP on the LAN Part 3

Wed, 15 Feb 2017 22:10:21 GMT

TCP segments user data into manageable units, then appends a TCP header that includes the destination port, segment sequence number, and checksum to test for errors in transmission.

The Domination of TCP/IP on the LAN Part 2

Wed, 15 Feb 2017 22:00:59 GMT

Each of the services implied by these protocols should generally be present in any implementation of TCP/IP, although SMTP was not always supported by microcomputer-based systems.

The Domination of TCP/IP on the LAN Part 1

Wed, 15 Feb 2017 21:54:13 GMT

TCP provides the packet sequencing, error control, and other services required to provide reliable end-to-end communications while IP takes the packet from TCP and passes it through whatever gateways are needed, for delivery to the remote TCP layer through the remote IP layer. Some networks, in fact, could use IP but not TCP, preferring instead to use some alternative protocol at the transport layer.

Some final notes on MANs vs LANs

Tue, 14 Feb 2017 22:42:29 GMT

With the development of higher-speed (14,400 b/s and higher), reasonably priced telephone modems, the situation was changing. Because analog telephone service is electronically noisy, however, the extensive error-correction techniques necessary for high-speed dial access service resulted in unpredictable service, which may limit throughput.

How Networks Enabled Distributed Computing

Mon, 13 Feb 2017 13:24:03 GMT

At that some point it will be important to understand how LANs fit into the overall OSI scheme of things, and that will be illustrated by reference to MAP, the Manufacturing Automation Protocol in some future post.

Local Area Networks Built Cooperative Computing

Mon, 13 Feb 2017 01:41:50 GMT

A large, powerful database-management system may need additional computing power in order to meet response time objectives, or it may be desirable to maintain large amounts of data subject to extensive scientific analysis to be available to multiple researchers.

Frame Relay Physical Layer Options and Frame Formats

Sat, 11 Feb 2017 13:08:32 GMT

In addition to these guidelines, the UNI IA acknowledges that other interfaces, such as ISDN, may be used as appropriate. For example, MCI currently offers frame relay as a switched digital service at 56/64 Kpbs, and also as a fractional T1 service, Nx56 or Nx64 Kpbs.