Intermec PENKEY 6100 Programmer's Reference Manual page 234

Conversions and Interfaces
INT 1Ah, Function AH = 03h: Set the Real-Time Clock Time
BIOS
On Entry:
On Return:
INT 1Ah, Function AH = 04h: Read the Real-Time Clock Date
BIOS
On Entry:
On Return:
INT 1Ah, Function AH = 05h: Set the Real-Time Clock Date
BIOS
On Entry:
On Return:
R
6-98 PEN*KEY 6100 Computer Programmer's Reference Guide
SECTION 6