Actia IHMI, User Manual

Page: 34 / 52

DOC 02110-1 ACTIA PCs Page 34 / 52
Specific BIOS functions
In addition to standard BIOS functions, specific functions are provided.
INT 15h, AH=0E2h - E
2
PROM Check
Output: AX=E
2
PROM size in bytes (0 if not available)
BX=first free byte (=reserved bytes count)
INT 15h, AH=0E3h - E
2
PROM write
Input: BX=byte address
AL=data
Output: AH=0 and CF=0 if OK
AH=86h and CF=1 if address not valid
Note: do not modify reserved bytes.
INT 15h, AH=0E4h - E
2
PROM read
Input: BX=byte address
Output: AL=data
AH=0 and CF=0 if OK
AH=86h and CF=1 if address not valid
INT 15h, AH=0E9h – SMBus device register byte write
Input: BL=register number
BH=device address (right aligned)
AL=data
Output: AH=0 and CF=0 if OK
AH=86h and CF=1 if not available or error
INT 15h, AH=0EAh – SMBus device register byte read
Input: BL=register number
BH=device address (right aligned)
Output: AL=data
AH=0 and CF=0 if OK
AH=86h and CF=1 if not available or error
INT 15h, AH=0EBh – Boot device presence test
Input: BL=device code
Output: AL=0 if not present, 1 if present, 2 if unknown
AH=0 and CF=0 if OK
AH=86h and CF=1 if not available or error
INT 15h, AH=0ECh – Define boot device for next boot
Input: BL=device code
Output: AH=0 and CF=0 if OK
AH=86h and CF=1 if not available or error
Boot device codes :
1 floppy disk
2 IDE 1 hard disk
3 IDE 2 hard disk
4 SATA 1 hard disk
5 SATA 2 hard disk
6 SATA 3 hard disk
7 SATA 4 hard disk
8 USB storage device
9 CD-ROM