I was given an Atari 520 stfm computer and a high rez Atari monitor, it doesnt boot up from the drive I do have an external floppy but it wont boot from it nor will it write 720 kb disks it has 1.02 tos so it seems quiet ancient. Any possibility of upgrading? more ram ,latter tos and 720kb/1.44 mb drive or should i just hunt around and find a single density drive if they still are available?