Anything old that had some value when it was new must become collectible one day - in the case of your stuff it might be a longer time than you will be prepared to keep it ?
I had one of the very first 'brick' portable telephones and kept it in working condition and 'on line' as it would clearly become valuable at some point - my ex waited until I was away then dumped it so that I could not stop her.
Consumables like floppy disks or cassettes are worthless.
If you find something nostalgic, then look if there is a serial number or some proof of origin.
There is a very old Apple II computer collecting dust in my house. It was built in 1977 with serial no. 2001. Came with a RAM upgrade to 16kB and the red book manual with handwriting from Steven Wozniak (co founder of Apple). It was my first computer and i could not dispose of it. Recently my son in law told me that this type of old computer was traded for some 15.000 USD and up. Sometimes it is worth not throwing things away.
Old stuff generally has no value unless it's quite rare, and in mint condition. Also, lots of people have to want it badly enough to pay a ridiculous price for it.
Computer technology in particular is not old enough or rare enough to become a collectable item. The old stuff is amusing, just to see how far we've come, but otherwise belongs in a museum, of which there are quite a few. Or recycled in some way.