On 29 Jun 98 at 16:26, Mark Rode wrote:

> I am working on an old 486 ISA bus with a add in controller card. The card
> handles the hard drive (one channel) the floppy, the serial ports (2) and a
> game port. The hard drive is an Seagate AT 350 meg MODE 1 the CD ROM is a
> newer Sanyo 8 speed Mode 3 .
>  The PC is set up with an 1993 Mozart sound card and an old no name sound
> card IDE controller. The CD ROM has been upgraded but is still plugged into
> the old sound card controller which was original for one of those one or
> two speed proprietary drives.

  My understanding is that most "IDE" CD-ROM drives actually require
ATAPI, and will therefore work with EIDE but not with vanilla IDE.
[If your controller card were EIDE, it would offer two channels, and
you could put the hard drive on one and CD-ROM on the other.]

  In theory, putting both devices on your current IDE channel will
likely run both at Mode 1 -- you may not actually see any difference.
But that's only if it works, and I don't think it will.

David G