I seem to remember that it wasn't that much more to just buy a new computer. Especially with having to buy new RAM pairs anyway at up to $100 a meg...we just sold our Laser Turbo XT/3. (I wish they'd bring back the turbo button...ASUS has some NOS thing that can overclock on demand, but it just ain't the same.)
The HD version of the 5 1/4" disks were great... 1.2 megs versus 1.44, yet half the price.
21710 MFLOPS on Sandra - I'm amused that the random difference between tests is far greater than the power of my first computer.