File:SModem.png

Summary

Non-free media data
Description	SModem v1.0 file transfer protocol in use. Picture made by the uploader.
Source	Self-taken screenshot.
Portion used	A screenshot of the SModem shell, with the chat conversation showing and two files being transferred in both directions at the same time.
Low resolution?	Yes, and text content only.

Licensing

This is a screenshot of copyrighted computer software, and the copyright for its contents is most likely held by the author(s) or the company that created the software. It is believed that the use of a limited number of low-resolution screenshots:

for identification of, and critical commentary on, the software in question,
in the absence of a free alternative,
on the English-language Wikipedia, hosted on servers in the United States by the non-profit Wikimedia Foundation,

…qualifies as fair use under United States copyright law. Any other uses of this image, on Wikipedia or elsewhere, may be copyright infringement. See Wikipedia:Non-free content for more information. Fair use //en.wikipedia.org/wiki/File:SModem.png

Use rationale

Non-free media rationale for SMODEM
Article	SMODEM
Purpose of use	This screenshot illustrates the main differentiating feature of SModem compared to other file transfer protocols of the time. The possibility for two parties to chat and transfer files to both directions at the same time.
Replaceable?	No. As the software depicted is copyrighted, it is not possible to create a free replacement for it.