This has also been known to work on the ET-237.

First, download the software.

The 1341 serial interface operates at TTL (not RS-232) levels, so you must use a converter. The pins are numbered from left to right with the phone face up.

Using the MAX203 converter and a DB-25 for the computer's serial port:

Computer                     
 DB25                         Phone
2----------MAX-203------------11

3----------MAX-203------------12

7-------------GND--------------8
   |
8---

5---
   |
6---

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