BiModem
From Wikipedia, the free encyclopedia
BiModem was one of the last file transfer protocols developed for use in BBS systems. It was created by Erik Labs, and was revolutionary for its day.
Unlike the predominant protocols of the day (XModem, YModem, ZModem), this was a bi-directional protocol. In other words, you could upload and download files at the same time. This resulted in significant time savings when a 1 megabyte file would take more than an hour to transfer using 130 to 250 characters per second over a 1200 or 2400 baud modem. In addition, it had a chat feature. This would allow the user and the sysop to converse during the upload/download of files.
It never received wide-spread acceptance however. It had to be manually patched into both BBS and terminal emulator packages, and it was incompatible with some programs. It was released in the end of 1989, and before it saw wide spread use, HSLINK HSLINK was created which was able to be easily added to bbs's and allowed for file lists and bidirectional sending.
The final version (BiModem 1.25) was released in 1991, and all development was stopped after that.
In 1995 a program was released in Argentina called BiModem Pro 4.0. This was a user modified version of BiModem 1.25 with some minor bugfixes.
