IBM 3270 PC

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IBM 3270 PC (System Unit 5271)

Type	Personal computer/Terminal emulator
Release date	October 1983; 42 years ago (1983)
Discontinued	1987 (1987)
Operating system	3270-PC Control Program with PC DOS 2.0 or 2.1 IBM 3270 Workstation Program with PC DOS 3.3
CPU	Intel 8088 @ 4.77 MHz
Memory	256KB ~ 640KB

The IBM 3270 PC (IBM System Unit 5271), is a personal computer developed by IBM and released in October 1983. Although its hardware is mostly identical to the IBM PC XT, the 3270 contains additional components that, in combination with software, can emulate the behavior of an IBM 3270 terminal. Therefore, it can be used both as a standalone computer, and as a terminal to a mainframe.

IBM later released the 3270 AT (IBM System Unit 5273), which is a similar design based on the IBM PC AT. They also released high-end graphics versions of the 3270 PC in both XT and AT variants. The XT-based versions are called 3270 PC/G and 3270 PC/GX and they use a different System Unit 5371, while their AT counterparts (PC AT/G and PC AT/GX) have System Unit 5373.^[1]