IBM 3270 PC

The IBM 3270 PC (type 5271 ), introduced in October 1983, was basically an IBM PC XT, which, however, at the time of publication nor necessary additional hardware to emulate a terminal type 3270 included. So was the 3270 PC can be used both as an ordinary personal computer, as well as a terminal in the host terminal system.

In addition, the AT 3270 (type 5281 ) was available. It corresponds to the 3270 PC, but based on the IBM PC AT in place of the XT PC as a basic model. For an explanation of the technical differences between the two devices, see IBM PC AT.

Technology

The additional hardware occupied almost the entire space in the computer, which was provided for extensions. It included a multi-part, programmable graphics card expansion from TTL chips. To meet the higher requirements of a 3270 graphics, a CGA - compatible graphics card with a slightly higher resolution has been installed. Another expansion card caught the signals from the supplied PC/3270-Tastatur, processed 3270 key codes, and led the PC key codes to the normal keyboard connector on. For the connection to the host computer - usually an IBM mainframe - made ​​another card, which provided a 3270 - compatible serial interface with BNC connectors.

Models

  • 3270 PC (type 5271 ) - Original 3270 PC
  • 3270 PC / G (type 527? ) - 3270 PC with improved graphics hardware and mouse support
  • 3270 PC / GX (Type 527? ) - 3270 PC / G with another color or monochrome monitor
  • 3270 AT (type 5281 ) - Corresponds to the 3270 PC, but based on the IBM PC AT
  • 3270 AT / G (type 528? ) - Corresponds to the 3270 PC / G, but based on the IBM PC AT
  • 3270 AT / GX (Type 528? ) - Corresponds to the 3270 PC / GX, however, based on the IBM PC AT
Emulation Color Graphics Adapter
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