I dont quite understand your setup. You set PIO4 on the BIOS to IDE1, which is the onboard FLashROM and it seemed to be the limit? Or did you add a CF card to the IDE chain and did this test?
From my research the FlashROM board is nothing more than a custom sized Compact Flash card. I contacted some of the chip OEMs asking for a datasheet so I know what kind of speeds to expect, but they have not replied yet.
My question is: How fast is the IDE bus, and what compact flash card would be ideal?
Hacking is not a crime, It's a passion - www.BSoDtv.org
If you need someone to IDE mod your DT366 toss me a PM.