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The Yamaha PortaSound VSS-200 is a portable musical keyboard produced by the Yamaha Corporation in 1988...
http://en.wikipedia.org/wiki/Yamaha_VSS-200


LÖTKUNST:YAMAHA VSS-200 – Digital Voice Zerrer
circuit Bending teil 1
http://www.sequencer.de/synth/images/b/b1/SynMag_12-2006_mini.pdf


Owner's Guide at manufacturer's site
http://www2.yamaha.co.jp/manual/pdf/emi/english/port/VSS200E.PDF

Yamaha VSS-200
Bending report in progress.
http://www.electri-fire.com/yamahavss200.htm


YAMAHA VSS SERIES SAMPLER MODS
http://circuitbenders.co.uk/VSS.html



The Yamaha VSS-200 is a strange beast. In most respects it is a standard 80's Yamaha home keyboard with 100 vaguely realistic sounds and all the standard rhythm and auto bass type nonsense, but look on the right of the control panel and we find a remarkably well equipped 8 bit sampler.
http://www.circuitbenders.co.uk/forsale/vsssale.html


http://www.retrosound.de/vss-200.html


http://www.casiosk1.com/vss200.cfm


http://www.legoluft.de/tech/bending/yamaha-vss-200.html


http://oxo-unlimited.com/wordpress/2007/04/10/bent-vss-200/



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The YM2413, also called OPLL, is a cost-reduced sound chip manufactured by Yamaha Corporation
http://en.wikipedia.org/wiki/Yamaha_YM2413

http://www.msxarchive.nl/pub/msx/mirrors/hanso/datasheets/chipsym2413.pdf


http://msx.retro8bits.com/msxdocs/ym2413.pdf

YM2413 FM Operator Type-LL (OPLL) Application Manual
http://www.smspower.org/maxim/docs/ym2413am/


http://www.getlofi.com/2005/09/yamaha-ym2413-simple-fm-sound.html



PSS-270, 170, 140 and SHS-10 Tutorial
by admin on June 3, 2008
After some major diggin' for info I found that no one had a specific guide for bending a Yamaha PSS-270, so I decided to make one. Credit to Sean "audioid" (myspace.com/audioidbentaudio), and Paul from circuitbenders.co.uk for the info on this bend. This bend involves cutting data lines that go from the FM synth chip (YM2413) to the main chip (XC194A0). The pins on the FM chip that go to the main chip are pins 2, 3, 4, 5, 6, 7, 17, and 18. You cut the traces, and then solder wires on either side of the cut. Take the pair of wires from one cut, and solder them to a switch, and this will allow you to turn the flow of data on and off.
http://circuit-bent.net/pss-270-tutorial.html


I got my hand on Yamaha PSR-6 and of course I did bend it :)
here is the story, hope you can learn something. ... here are the two main chips the XE323B0 is CPU and YM2413 is the FM sound chip.
http://aeeprojects.blogspot.com/2007/02/bending-yamaha-psr-6.html

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Yamaha YM2413
http://en.wikipedia.org/wiki/YM2413

FM Operator
http://www.xs4all.nl/~ronholst/map/resources/sound/yamaha_ym2413_ds.pdf

VSS-200 (Service Manual)
http://www.transanalog.com/manuals/Yamaha