device:

A system device. It can be a disk drive, the display, a printer, or an RS232 port. If you include filename, device must be a disk drive. The COBOL system recognizes the following symbolic device names:

A, B, ...Z Disk drive
CON Console keyboard or screen
AUX, COM1, PUN Alternative names for the first asynchronous communications adapter port
COM2 Second asynchronous communications port
LPT1, LPT, LST, PRN Alternative names for the first parallel printer
LPT2, LPT3, LPTn Second, third and subsequent parallel printers
ERR Standard Error Output
NUL Dummy device - do not create (not available with indexed files)