Odaman,
Have you tried a warm-boot after a cold-boot to see if the CD-ROM is detected on the warm boot? This was a trouble-shooting step I saw to help tell if the CD-ROM is just taking too long to spin up and make its presense known. There was also mention of needing to run loadide to get the second channel recognized. Maybe somebody with an a1200 and the 4-way ide adapter using both channels can post part of their startup sequence showing the correct way to load the drivers? Then you can compare it to yours and see if that helps move you in the right direction. It'd also help if they posted their idefixprefs too.
-David