RLL Drives with PCI motherboard

I am going to help a friend upgrade his 486sx to a Pentium 133 and a new motherboard.  My problem is that his hard drives are both RLL drives, and he insists on keeping them.  The drives should work fine, should they not, so long as I install the interface card into the new  motherboard?  But do I need to disable the on-board IDE interface?  And is there anything else I should be aware of?  Just trying to prepare myself for any oddities...thanks!
mknowlesAsked:
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j2Commented:
Yes you neeed to disable the onboard IDE controllers... but you might be in for all kinds of nasty surprises... you friends new system will be UNBELEIVABLY slow with RLL drives/ISA controller.
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mknowlesAuthor Commented:
Actually, the system runs not too badly.  He's very pleased, but then, he's only running MS Office apps and a couple of games from a secondary IDE drive.  IMO, my friend got screwgled when he bought this system but, hey, if he's happy, I'm happy.

Thanks.
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