You will need an IDE controller card, not some special cable
According to your posting, your motherboard has 2 IDE channels, which are both in use, holding the maximum number of supported devices. There is no such thing as a cable that would "allow more than 2 hard drives/ CD ROMs per ribbon", as you had asked for.
Some motherboards have 2 or more SATA channels in addition to the standard 2 IDE channels, which means that you may be able to add 2 or more hard disks by switching to SATA hard disks. Please note that many motherboards can only boot from an SATA hard disk when one or more SATA hard disks are installed, so only go that route if you have your Windows XP CD, and discs for all other software programs that you need to install.
If you need/want to install more IDE peripherals, either hard disks or CD-ROM drives, then you can always add a PCI controller card. Some of these cards offer RAID functionality or other special features. Promise Technologies is one of the most famous manufacturers of this type of product.
In any case, I am surprised that you need so many storage devices. Most PC cases can hold only 2 optical drives and 2 hard disks, so the 2 IDE channels offered on a standard motherboard are MORE than adequate. In fact, many PC's being sold today have motherboards that can support many more devices that what the case can possibly hold, such as 4 SATA channels, 2 IDE channels, and a standard floppy disk header.
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