I came across a used Robotics Invention System 2.0 set, but in addition to a few missing bricks, it is missing the IR tower. Is there any generic replacement that I can use to program the RCX or does anyone know where I can find a schematic to build my own? Thanks...

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There is no non-LEGO product that can substitute the infrared tower used for communicating with the RCX, as the USB and Serial towers use a very specific protocol that does not match that of other Infrared devices. Nonetheless, it does appear that there are schematics available for the IR Tower, courtesy of Mark Bellis:

RCX Infrared Tower schematics

I'm no expert on low-level electronics, but it looks like this site has a lot of additional information that could be useful if you want to replicate/manipulate the IR tower.

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