HI,
As your machie is somewhat older it does not have the usefull feature of a removeable drive carriage like newer machiens so to change ot the drive you will need to partially dissasemble your machine.
This guide to take apart a 1115 should work for you as appart from color there is very little difference http://www.geocities.com/ge64/1115-S103/index.html
Just remember to do this in a well lit area and to ground yourself by touching a metal object like a faucet before you start.
Let us know if you need more info.
Thanks
Eric
IEEE Network Engineer, Microsoft
approx 20 years of experience from software to hardware design
James,
Glad it worked for you.
Thanks for using JustAnswer.com
Regards