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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== |