IBM LAN Network 
IT Toolbox
JUNE 15, 2017
Particularly in the areas of microcomputers, LANs, and enterprise networking, IBM's insistence that its customers remain "pure blue" ran against both the economic and technological developments set in motion before 1990.
IT Toolbox
SEPTEMBER 27, 2017
the network system calls then provided under interrupt 21H gave all suppliers of network software the capability to standardize at least some of the access to LAN hardware. Most manufacturers of LAN software had announced or implemented support of NETBIOS for IBM LANs. When DOS was extended in Version 3.1,
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IT Toolbox
SEPTEMBER 25, 2017
The NETwork Basic Input Output System (NET-BIOS) was introduced at the same time IBM announced the PC Network in 1984. The network microcode was the foundation for program control of the IBM LANs; it resides in ROM on the Adapter Card, on diskette, or on the PC's motherboard.
IT Toolbox
FEBRUARY 16, 2017
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.
IT Toolbox
FEBRUARY 16, 2017
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.
IT Toolbox
MARCH 9, 2017
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.
IT Toolbox
MARCH 9, 2017
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 End User and Physical layers are not part of the formal scope of SNA.
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