The DX100 is a small and portable budget DX synthesizer from Yamaha. Like all DX's it uses (FM) Frequency Modulation synthesis. It's not the easiest form of synthesis to program but can result in some excellent sounds. The DX100 is not as flexible nor powerful as a DX7, but it does have some cool sounds. It is most renowned for its great analog bass sound (Patch #01) that is awesome for techno, house, jungle, and acid music styles...
http://www.vintagesynth.com/yamaha/dx100.php
http://www.synthman.com/yamaha/index.html
DX27 / DX27S / DX100 Programming Guide
http://www.synthman.com/cgibin/pdf/dl.php?f=yamaha/support/DX27SE2.pdf
DX100 Owners Manual
http://www.synthman.com/cgibin/pdf/dl.php?f=yamaha/support/DX100_Owners_Manual.pdf
Yamaha DX-100
http://members.multimania.co.uk/templarseries/dx100.html
DX100
Manual:
DX100 Owners Manual #1
DX100 Owners Manual #2
Bonus Literature:
DX27, DX27S & DX100 Voice Programming Guide
DX27, DX27S & DX100 Schematic
DX27, DX27S & DX100 Service Manual
http://nuxmicromedia.tripod.com/cgi-bin/dx4op.cgi?mode=dx100
YAMAHA DX100
We're willing to bet that most FM synths are still programmed pretty much randomly, with very little real understanding of how the operators actually interact with each. In that spirit of random abuse, we have added 8 'dataline' cut switches to this DX100.
http://www.circuitbenders.co.uk/newsarchive/DX100.html