Dual channel IDE´s in iMac 266?



Hello, my iMac 266 have two IDE controller (one for HD and another for CD), but I don´t know if these IDE´s have two channels (0 and 1).

I need put a second HD (slave) for a test, in one of these IDE´s with a "Y" cable.

Another question, anybody know where can I obtain a iMac 266 motherboard circuit diagram ?

thanks and best regards

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