Intermec PENKEY 6100 Programmer's Reference Manual page 201

SECTION 6
INT 14h, Function AH = 01h: Send a Character
BIOS, 4000API
On Entry:
On Return:
INT 14h, Function AH = 02h: Receive a Character
BIOS, 4000API
On Entry:
On Return:
INT 14h, Function AH = 03h: Get Port Status
BIOS, 4000API
On Entry:
On Return:
R
PEN*KEY 6100 Computer Programmer's Reference Guide
Conversions and Interfaces
6-65