Is it likely there is one of those little batteries on
it that would
now be dead and need replacing before I try to use it?
If it has a battery, it'd be on an add-on board, so check to make sure there
aren't leakers, but otherwise no.
Your more likely issue will be shorted tantalums. It's a 256K XT motherboard in
there.
And, also, would this have a floppy controller on it
that was capable
of reading and writing disks from systems like the TRS-80 with an SD
boot track?
Almost certainly no, if it has the external floppy connector (37-pin D-SUB). There were
third party controllers that will.
Thanks,
Jonathan