I had a 1000HX (still have, I think -- it's out on
loan) with internal 5
 1/4, external 3 1/2
  
If it has a 5 1/4" internal (on the right side?) then it is a
1000EX and not HX.
They're similar but I forgot what the main difference was other than
the drives. I don't think the EX has a setup program like the HX's
SETUPHX is one. Wonder if it's possible to change settings on the
EX like the HX (EEPROM).
Marc