IBM 3270 PC

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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.

Contents

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.

  • 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.

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