The NABU Network was an early home computer system which was linked to a precursor of the Internet, operating over cable TV. It operated from 1982 to 1985, primarily in Ottawa, Canada. Its functionality was then revolutionary, though it was not a commercial success. It has been called "The Internet — 10 years ahead of its time".
Families, schools, or individuals would purchase a NABU Network PC, which would be connected via cable TV to NABU's servers. In addition to normal PC capabilities of the time, the computer could download software and information content through the cable feed and could upload primitive information back up to the servers. Applications included games, the programming language Logo, news/current events, and rudimentary PC banking/shopping. At its peak, approximately 100 applications were available.
The Nabu Network can be credited as being the first online version of fantasy baseball. The Game, aptly named Managers Baseball, allowed for choosing teams based on the real names and statistics of MLB teams and players. Player performance in the game was based on real life player statistics and as a Manager you would draft your team and compete against another owner in a mock up game in a purely managerial role.
The heart of a NABU (which stands for Natural Access to Bi-directional Utilities) PC was the Z80A processor chip (running at a then lightning-fast 3.57 MHz) and the cutting-edge TI 9918 video chip, which was able to produce some very good graphics for its time. All this was served up via a Gould SEL mainframe. The logic module included four socketed chips: a TR1865CL-04, a full-duplex UART, an SC87253P 8-bit microprocessor, an N8X60N FIFO I/O controller and a pre-programmed ROM. The remainder of the parts on the board were numerous 74LS series logic ICs. There was an RF module that down-converted signals from the cable connection and up-converted requests to be sent to the server. There were four circuit boards for frequency synthesis, data in and out and RF conversion and dual helical coil bandpass filters.
Download speeds over the cable TV line were up to 6.4 Mbit/second.
By default, the PCs lacked any individual offline storage, but an optional hard drive could be purchased.
The NABU service first became available in 1983 through Ottawa Cablevision and Skyline Cablevision, through the efforts of John Kelly and Bruce Hempell. The project was heavily subsidized by the Canadian government. A major weakness of the Ottawa network was the strictly one-way connection as it was implemented on Ottawa Cablevision. NABU was bi-directional but most cable networks of that era did not support this feature due to cost.
Another network was started in Japan. However, NABU never achieved commercial success and ceased operation in 1985.
Display at York University Computer Museum
York University Computer Museum (YUCoM) and Center for the History of Canadian Microcomputing Industry provides a display and a virtual tour of this and other Canadian inventions.       
- IEEE Canada page describing NABU project
- YUCoM NABU Reconstruction Project
- Jim Ducharme, The Nabu Network, PC World, December 4 2005. Archived at York University YUCoM.
- http://ottawa.ctv.ca/servlet/an/local/CTVNews/20091117/OTT_Nabu_091117/20091117 video