For sale: Serial adapter cable for the TRS-80 Model I with Radio Shack's RS232C serial board installed in the Expansion Interface.

These cables have not been available from Radio Shack since 1983.

Perhaps you have the RS232C board bit are missing the all-important cable which goes from the front of the EI to your serial device?  This cable solves that problem.

NOTE: This listing is for one cable only.  One of the pictures shows the cable sitting next to an original RS cable.  You are buying ONE of the NEW adapter cables.

Here is a video showing the cable up and running on my own TRS-80 Model I: https://youtu.be/x_lm_ZlUcd8