Terminal Emulation Glossary

700/9x (HP 700/96, HP 700/98) terminal
A class of HP client terminals made by HP beginning in the 1970s to connect to HP 3000 minicomputers.

A protocol commonly used via terminal emulation to access IBM mainframe-based applications. The term is also used to refer to IBM mainframe connectivity in general

3270 terminal
A class of IBM client terminals made by IBM beginning in the 1970s to connect to IBM mainframes and run text-based and graphics-based applications.  Popular terminal types included 3278, 3279, 3178, 3179, 3290.

A protocol commonly used via terminal emulation to access IBM AS/400-based applications. The term is also used to refer to IBM AS/400 connectivity in general.

5250 terminal
A class of IBM client terminals made by IBM beginning in the 1980s to connect to IBM AS/400 midrange computers.

6530 terminal
A class of terminals made by Tandem beginning in the 1970s to connect to Tandem midrange systems.

Computer terminal (dumb terminal)
A hardware device with a screen and keyboard that connects to a host system, like an IBM mainframe, and enables display and input to applications running on these host systems.  Dumb terminals have been replaced by terminal emulation software that runs on a smart personal computer with a client operating system and connects to legacy host applications.

Green screen
Early IBM terminals displayed host application text on monochrome monitors in the color green on a black background and are still referred to in this manner.

HLLAPI (High-Level Language Application Program Interface)
An IBM standard application program interface that allows PC applications to access mainframe data without requiring modification of the mainframe application. Often used to increase user productivity by automating business processes. Variants of the HLLAPI standard include eHLLAPI, WinHLLAPI, DOS HLLAPI, and others.

HP 3000/e3000
Hewlett-Packard’s mini-computer platform released in 1973 for time sharing of business applications.

IBM AS/400 midrange (iSeries, IBM i, IBM Power Systems)
IBM’s midrange server-based computing platform for departmental applications within a business.

IBM mainframe (System z)
IBM’s server-based computing platform that enables enterprise companies to scale to support large numbers of users.

An IBM mainframe file transfer program that allows for the transfer of files between a PC running a 3270 emulator and an IBM mainframe.

A client and server computer operating system similar to UNIX. Created by Linus Torvalds, Linux is free and maintained in a collaborative manner using an open source software development model.

OpenVMS (Open Virtual Memory System)
A computer server operating system that runs on Digital Equipment Corporation (DEC) VAX, DEC Alpha, and HP Itanium-based server platforms. Previously also known as VAX-11/VMS, VAX/VMS, or VMS.

Tandem/HP NonStop System
Tandem’s server-based computing platform designed to be fault-tolerant and maintain a high level of availability.  Tandem was acquired by Hewlett-Packard in 2003.

A network protocol used on the Internet and on local networks to provide communications between a host computer (UNIX/Linux) and a workstation via a terminal connection.

Terminal emulation
Computer software for Microsoft Windows and other PC client operating systems that emulates a dumb terminal for connecting to and interacting with host systems.

A 3270 protocol implemented using the Telnet 3270 standard.

A 5250 protocol implemented using the Telnet 5250 standard.

Originally developed by AT&T, UNIX is a server-based operating system that scales to support many users.  Several vendors have created commercial versions of UNIX, notably Sun (Solaris), Hewlett-Packard (HP-UX), and IBM (AIX).

VT terminal
A class of Digital Equipment Corporation (DEC) client terminals made by DEC beginning in the 1980s to connect to DEC/VAX computers.

Server-based operating system for the IBM System z mainframe platform.