RTTY is the oldest real Data mode and was first used on amateur bands over 50 years ago. In those days it was a complex model to use, with teleprinters and homemade transmitters to modify. However, in the computer age, it is much easier to both use and set up.
RTTY and PSK31 for Radio Amateurs provide you will all you need to know to get the most out of this fascinating area of amateur radio. Readers will find details of where to find data modes on the amateur bands, from getting started, to making the most from both these modes. DX-peditions and contests use these modes and there is lots of information on getting the best from these two.
The free CD that accompanies this book provides an A-Z of amateur radio data mode programs to get you started. You will also find reviews of equipment, lots of reference material and web links, essential reading for anybody interested in Data. RTTY and PSK31 for Radio Amateurs does though carry a warning: Buying this book may lead to an enjoyment of RTTY, PSK31 and Data modes in general that is highly addictive.