2-3 years ago was the last time I dabbled and struggled with SSDs on PATA interfaces on laptops. All solutions eventually became expensive and that was back then. In your case that 50 pin connector will reduce your options even more. It's simply not worth the trouble or cost. It maybe best to save up for a new one.
However, if you insist, if you can sacrifice your optical drive, you can find SATA to CD-ROM adapters. The other is a CardBus or PCMICA SATA adapter. That option means the SATA SSD lives outside the laptop. Both will be fine if you can change your bootup order or if you are good with boot manager. Check the notebookreview forums. The knowledge found there is endless and it's backed up with experience.