Lego RCX 1.0 problem with communication I have a problem with communication between the tower (it's installed and it's working - green light when communicating by IR ) and a RCX 1.0. It's not downloading .lgo file. I've tried with few versions of this file and it's the same. 

Now I'm trying on my PC in ROBOTC. Green light is lighting but RCX doesn't respond. I think it is failed. But manually with built in programs it's working
Try to use this (Windows XP x86):

RIS v2.0 software -> http://www.mediafire.com/download/vrg2iajcv4uxkf3

Updated USB Tower drivers -> http://www.philohome.com/sdk25/tower164.zip

Also maybe you have a faulty RCX or IR tower. Try to change the battery of the IR tower.

I recommend the use of the Windows XP x86 (32 bits) for install the RIS v2.0 software. You have to uninstall any QuickTime installed in the PC and install the QuickTime that comes with the RIS v2.0.