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* [[154 | Model 154 RS-232C Interface]]
* [[154 | Model 154 RS-232C Interface]]
These connect to the calculator through card-edge bus connector cables.
These connect to the calculator through card-edge bus connector cables.
==Manuals==
* [http://w140.com/tek_21_31_calc_interfacing.pdf Tektronix 21 and 31 calculators interfacing information]


==Links==
==Links==