Intermec PENKEY 6100 Programmer's Reference Manual page 176

Conversions and Interfaces
INT 10h, Function AH = 09h: Write Attribute & Character at Cursor Position
BIOS, VROTATE
On Entry:
On Return:
INT 10h, Function AH = 0Ah: Write Character Only at Cursor Position
BIOS, VROTATE
On Entry:
On Return:
R
6-40 PEN*KEY 6100 Computer Programmer's Reference Guide
SECTION 6