SCSI question

[pubpc1@library.ucla.edu]

I have a rather unusual SCSI drive that has a DB-25 port
instead of the regular Centronics-50.  Can I use a straight
through DB-25 serial cable to connect it to an SCSI card?
Assuming that all 25 pins on the serial cable are connected,
of course.  I'm thinking of a serial modem cable.

Also, how does one determine the correct orientation of an
internal IDC-50 ribbon cable?  There are those that lack
the orienting gromet (the stub that prevents plugging the
cable upside down).  What would happen if the drive
mechanism was plugged in the wrong way?

-Scott G.