IBM 5170  -  Basics, for 5170 beginners

There were different models of the IBM 5170 (IBM AT).
Do not assume that what applies to one model also applies to the others.
SETUP (BIOS configuration) ("CMOS SETUP") cannot be accessed via keyboard.  Methods for SETUP are at here.
The floppy drive supplied by IBM is a 1.2M one.  Click here to read about a problem caused writing to 360K floppies in that drive.
If your IBM 5170 has the optional second floppy drive, be aware that for the 5170, IBM marked 360K drives by placing an asterisk on the front of the drive.  (Photo)