Intermec PENKEY 6100 Programmer's Reference Manual page 219

SECTION 6
INT 15h, Function AH = 80h: Device Open
BIOS
On Entry:
On Return:
INT 15h, Function AH = 81h: Device Close
BIOS
On Entry:
On Return:
INT 15h, Function AH = 82h: Program Termination
BIOS
On Entry:
On Return:
R
PEN*KEY 6100 Computer Programmer's Reference Guide
Conversions and Interfaces
6-83