new finds and... Atari 810/1050 help

I was about to pass over an Apple IIgs at a local thrift store but didn't when I found a bunch of Sequential Systems cards in it. It's a rom 3 one thats got a RamFast/SCSI board, a VGA card!, a 7mhz(I think) ZipGSX board that displaces the gs's cpu by plugging into the cpu socket (and slotted too). There's also another card (in the first slot on the left) that has an eprom with a Sequential Systems label (SS, copyright 1993, rev QP290-BG) and a connector (like one interface from a drive II card) that I don't know anything about. It's nice using it with a VGA, and the zip makes a few of the ][ games I have on hand unplayably speedy. I've got a hd with gs/os that's momentarily unlocatable but I'm digging and hopeful. ;) Also. Does anyone have a service proceedure or any info on repairing atari disk drives. I have a 'stack' of em and many are having problems. Thanks - Mike: dogas(a)bellsouth.net