must use two soundcards

i upgraded from an old vesa local bus 486 to a asus pentium board.  i have new pnp soundcard, modem, video card, etc.  the only old thing that i am using from the old system is my cd-rom(an old X2). the modem does not get recognized if i take out the old sound card.
     the way it is set up now is new pnp sound card is hooked up to speakers,  old legacy sound card is used for the cd-rom interface. i have tried all other possible configurations. even taking away the cd-rom away all together.  the last one works but that does me no good at all.  do i need to buy a newer cd-rom?  and if so why does the interface not work on new sound card?  that works because i took it to a friends place and he plugged it in to his system and it worked fine.
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alexoCommented:
Does your CD-ROM use a standard IDE (ATA) interface?
If so, you can put it on the secondary IDE connector on your ASUS (or as a slave on the primary connector).

If the CD-ROM uses an older proprietary interface, you're berrer off replacing it with a newer one.  12X CLV drives will give you the best price/performance in most situations (if it's a money issue, used 4Xs are *very* cheap).

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