Intermec PENKEY 6100 Programmer's Reference Manual page 172

Conversions and Interfaces
Display Services: INT 10h
INT 10h, Function AH = 00h: Set Display Mode
BIOS
On Entry:
On Return:
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VROTATE
On Entry:
On Return:
R
6-36 PEN*KEY 6100 Computer Programmer's Reference Guide
SECTION 6