Your Performa 5260/120 has the same motherboard as the desktop (computer only) Performa 6320, that was sold in the U. S. The internal hard drive uses an IDE (EIDE) interface, so you could install a larger capacity hard drive, up to 120 GBs. There are (2) memory slots that can each accommodate up to a 32 MB 72-pin SIMM, for a total of 64 MBs of system memory. The internal CD-ROM drive uses a SCSI interface, so CD burners designed for that were more rare and even more difficult to find now. Yamaha made some models, but they were 2x, 4x, and 6x models. The problem with changing the CD-ROM drive in those models with a non-Apple drive concerns the long connection slot, located in the back of the chassis in those computers. You slide the CD-ROM drive in from the front of the computer. Instead of cables connected to the rear of the drive, it had a pair of adapters that plugged into (1) the power and data connections and (2) the audio output connection. The exact spacing between the connections on the back of Apple CD-ROM drives matched the slot into which those adapters mated. A CD burner made by another company might not have the same spacing between its rear connections, which means that the drive cannot connect properly to the slot in the chassis. Because of its design, that motherboard wasn't the best in terms of performance and in the U. S., it gained a bad reputation. Many of these upgrades for your now 20 year-old computer are discontinued, so you'd be looking for used parts. Even though you've had good service from your Performa, it's difficult to recommend spending the money to make it run a little bit faster. Your money would be better spent on a slightly newer, older Macintosh computer.
