How to get retro computers online using a smartphone

How to get retro computers online in 2025 using only a £12 cable (and a smartphone)

Rationale

There is a great deal of interest in connecting older (read pre-2000) computers to the internet. These computers would generally have come with an RS-232 serial interface which would connect to a modem and thence to a BBS or dial-up internet service.

Various solutions are available to solve this, including Pi-based modem emulators. I propose a simple solution, using only a £12 serial cable and an android phone. This is particularly helpful for portable computers such as my Psion 5mx and Netbook, as it is portable and needs no additional power sources

Overview

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