The SMX126 has been retired since 1991. It was used to connect up to six different interface devices to the PC201 card. One cable was required to connect the SMX126 to the PC201 card. Another cable was required to connect each peripheral to the SMX126. To use the SMX126, TELCOM version 6E and TERM version 5.0 or earlier needed to be contained in PC208 Datalogger Support Software.