→External links
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== External links ==
* [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc.
* [http://bompiler.com/pcb/cgs54 CGS54 BOM] at BOMpiler
=== Suppliers ===
* [http://www.elby-designs.com/webtek/cgs/cgs54/cgs54_xor.html CGS54 XOR/NXOR Logic], revision 1.1, Elby Designs
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