http://www.steptail.com/ 2026-04-15T05:04:40+0000 http://www.steptail.com/ http://www.steptail.com/_media/favicon.ico text/html 2022-12-28T03:32:48+0000 Anonymous (anonymous@undisclosed.example.com) http://www.steptail.com/guides:virtual_modem:script?rev=1672198368&do=diff VModem The script that simulates a Hayes compatible modem. A copy of vmodem can be also found at Github, at <https://github.com/molivil/vmodem> vmodem.sh The main script. This script will simulate a modem by answering to standard Hayes commands. It will open the serial port for communication and execute the dialed number as a linux shell script, however you could probably use any execututable with minor modification. For example, if you issue the command ATD12345, the script will look for a… text/html 2025-03-05T16:00:24+0000 Anonymous (anonymous@undisclosed.example.com) http://www.steptail.com/guides:virtual_modem:section_2?rev=1741190424&do=diff Section 2 - Shopping list Raspberry Pi 3 Model B/B+ Raspberry Pi Zero W or newer $15-45 Virtual modem has been tested with Raspberry Pi 3 model B and Raspberry Pi Zero W. Other Raspberry Pi models should work as well. 8GB or larger MicroSD memory card $5 eBay USB Power Adapter $5 eBay Prolific USB-to-Serial adapter $8 eBay. Get the one with the Prolific chipset (explanation below). Make sure it is a bi-directional communications cable. text/html 2025-02-10T22:52:59+0000 Anonymous (anonymous@undisclosed.example.com) http://www.steptail.com/guides:virtual_modem:section_3?rev=1739227979&do=diff Section 3 - Setting up Raspbian Install Raspbian Lite This section describes the basic installation of Raspbian onto your Raspberry Pi. If you know how to install Raspbian, and already know how to connect up everything, please feel free to skip to the next section! * Download the latest version of text/html 2025-02-10T22:53:10+0000 Anonymous (anonymous@undisclosed.example.com) http://www.steptail.com/guides:virtual_modem:section_4?rev=1739227990&do=diff Section 4 - Setting up Virtual Modem Required packages For the connection script to work properly, your Raspbian installation needs a few prerequisite packages. The most important of these is the PPP daemon “pppd” and IP Tables to route packets. Also xxd is used to decode raw bytes from the input stream. xxd should be preinstalled on Raspbian, but I'm including it in the installation list here just in case. text/html 2025-02-10T22:53:20+0000 Anonymous (anonymous@undisclosed.example.com) http://www.steptail.com/guides:virtual_modem:section_5?rev=1739228000&do=diff Section 5 - Using Virtual Modem Getting online Now you can proceed to check out the system specific guides on how to interface different vintage computers and devices with VModem. Once you are done, return back to this guide! * Connecting Windows 3.1 to the Internet * Connecting Windows 9x to the Internet * Connecting Windows 2000 to the Internet Make sure vmodem.sh is running on the Raspberry Pi first before attempting connection!