IBM Twinax

Twinax cabling is used by the IBM 5250 family of terminals and printers to connect to the System/34, /36, /38, and AS/400 midrange computers ("minicomputers").

Parameters:

  • screw-shell connectors (2 pins + shield, keyed)
  • shielded 110 Ω twisted pair
  • half-duplex balanced transmission
  • 1 Mbit/s transfer-rate
  • up to 7 devices per connection (address 0 – 6; can be non-sequential)
  • termination required, most T-connectors are auto-terminating

Adapter cards:

5250 Emulation Adapter/A
S36/38 Workstation Emulation Adapter
Local Twinax Adapter

Documentation:

Twinaxial' Cabling Troubleshooting Guide (SY31-0703-0)

Using the IBM System 36/38 Emulation Adapter Card As a Time Source (TDB)
Twinaxial Auto-Termination Cable Assembly (TDB)
Improved Surge Supression Circuit for Twinaxial Cable (TDB)


Twinax Terminal Adapters (from David Beem)

Many later terminals and terminal cards use DB-15 male -or- female connector and the appropriate adapter.


DB-25? to Twinax adapter + T connector

DB-25 to 2x Twinax attachment cable
for S36/38 Workstation adapter (P/N 72X6263)

DB-25 to 2x Twinax attachment cable
for InfoWindow (II?) Terminal

Content created and/or collected by:
Louis Ohland, Peter Wendt, William Walsh, David Beem, Tatsuo Sunagawa, Jim Shorney, Tim Clarke, Kevin Bowling, Tomáš Slavotínek, and many others.

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 19 Nov 2021 - Changes & Credits | Legal Info & Contact