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Information about Ibm 3270 Pc

The IBM 3270 PC (model 5271), released in October 1983, was an IBM PC XT containing additional hardware which could emulate the behaviour of a 3270 terminal. It could therefore be used both as a standalone computer, and as a terminal to a mainframe.

IBM later released the 3270 AT (model 5281), which was a similar design based on the IBM PC AT.

Technology

The additional hardware occupied nearly all the free expansion slots in the computer. It included a video card which occupied 1-3 ISA slots (depending on what level of graphics support was required), and supported CGA and MDA video modes. The display resolution was 720×350, either on the matching 8-color monitor (model 5272) or in monochrome on an MDA monitor.

A further expansion card intercepted scancodes from the 122-key 3270 keyboard, translating them into XT scancodes which were then sent to the normal keyboard connector. The final additional card provided the communication interface to the host mainframe.

Models

  • 3270 PC (model 5271) - original 3270 PC
  • 3270 PC/G - 3270 PC with improved graphics hardware and mouse support
  • 3270 PC/GX - Extended graphics support; 19-inch color or monochrome monitor.
  • 3270 AT (model 5281) - corresponds to the 3270 PC, but based on an IBM AT.
  • 3270 AT/G - corresponds to the 3270 PC/G, but based on an IBM AT.
  • 3270 AT/GX - corresponds to the 3270 PC/GX, but based on an IBM AT.

See also

External links

Type Personal computer
Released March 8, 1983
Discontinued 1987
Processor Intel 8088 @ 4.77 MHz
Memory 128 KB ~ 640 KB
OS IBM BASIC / PC-DOS 2.
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terminal emulator, terminal application, term, or tty for short, is a program that emulates a "dumb" video terminal within some other display architecture.
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IBM 3270 is a class of terminals made by IBM since 1972 (known as "Display Devices") normally used to communicate with IBM mainframes. As such, it was the successor to the IBM 2260 display terminal.
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Mainframes (often colloquially referred to as Big Iron) are computers used mainly by large organizations for critical applications, typically bulk data processing such as census, industry and consumer statistics, ERP, and financial transaction processing.
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Type Personal Computer
Released 1984
Discontinued 1987
Processor Intel 80286 @ 6 and 8 MHz
Memory 256 KiB ~ 16 MiB
OS PC-DOS 3.0+, OS/2 1.
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Connects to:
  • Motherboard via one of
    • PCI
    • AGP
    • PCI Express
  • Display via one of

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ISA
Industry Standard Architecture

Five 16-bit and one 8-bit ISA slots on a motherboard
Year created: 1981
Created by: IBM
Superseded by: PCI (1993)

Width:

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Color Graphics Adapter (CGA), introduced in 1981, was IBM's first color graphics card (originally sold under the name "Color/Graphics Monitor Adapter"), and the first color computer display standard for the IBM PC.
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The Monochrome Display Adapter (MDA, also MDA card, Monochrome Display and Printer Adapter, MDPA) introduced in 1981 was IBM's standard video display card and computer display standard for the PC.
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A scancode (or scan code) is the data that most computer keyboards send to a computer to report which keys have been pressed. A number, or sequence of numbers, is assigned to each key on keyboard.
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Type Personal computer
Released March 8, 1983
Discontinued 1987
Processor Intel 8088 @ 4.77 MHz
Memory 128 KB ~ 640 KB
OS IBM BASIC / PC-DOS 2.
..... Click the link for more information.
Type Personal Computer
Released 1984
Discontinued 1987
Processor Intel 80286 @ 6 and 8 MHz
Memory 256 KiB ~ 16 MiB
OS PC-DOS 3.0+, OS/2 1.
..... Click the link for more information.
A 3270 Emulator is a computer program that duplicates the functions of an IBM 3270 mainframe computer terminal on a PC or similar microcomputer.

As the original 3270 series terminals were connected to the host computer using coaxial cable, emulators required coax adapter
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