To connect a DVD ROM is very easy.
- open the case, usually 4 screws
- located the CD ROM already in your machine, follow the cable, since most decent techs or factory installs should have the CD on the IDE secondary there should be a spare connector on the end. This goes on the obvious matching female connector on the DVD ROM.
- same with the power cable, there should be several spare cables coming from the power supply. It also only goes on one way.
- Just look at the CD rom and see how it is mounted and connected, you will be doing it the exact same way, IN FACT, you could even TAKE OUT the existing CD rom and put in it's place the DVD ROM and use the same connections. If your computer is that old the DVD ROM will be faster than the 8x or 16x you may have in your computer now.
500Mhz no problem. It's really that easy 2 connections, the IDE cable and power, that is it.