I know it's not an 80s machine, but it's closer than my laptop is
I have a Gateway 2000 P4D-66, I've attached a picture. I'm wondering what is the largest hard drive this machine can handle.
I also have a failed Clock battery. Consider the computers build date is 1994 I don't think it's done too badly. Now it's a 4.5v Alkaline battery. I'm assuming that like their modern counterparts they are not rechargeable so 3x1.5v standard AA can replace it.