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Diff between Unimodem & Null modem.

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We come across many technical terms in day to day life, but many a times we dont know whats significance of them when it comes to comparison.
Can anyone explain me diff & tradeoffs between Null Modems & Unimodems ?
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Back in the pre-internet days (at least before the internet was commonly available in the home) you could use what was called a null-modem cable to connect two computers, to play games for example (Falcon was one such game). Simplistically, a null-modem cable was a serial cable that crossed it's transmit and receive lines on each end of the cable. Here is a diagram.
Me and a friend who shared a common bathroom between our rooms in a dormitory built one of these cables one time, strung it between our rooms, and would dogfight against each other in Falcon on our Amigas. Crashed quite a bit if I remember correctly, but this was around 1992 and kind of a novelty at the time, we had alot of fun with it.
As for Unimodem, I think it was a brand of modem.
[This message has been edited by Jason Menard (edited December 19, 2001).]
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