my 190cs is a nice vintage Mac, the very last powerbook with a 68k CPU..of course you could say you can't do anything modern of use even with a PPC Mac, even with a G3 it will be very limited. Basically they are writing machines. I think the most useful usage is that they are very capable bridge machines, lets say in a server/networking space with old Macs. A PB 190 then natively can talk to them while still portable and small.