HP Vectra Technical Reference Manual page 300

On Exit: AH
=
RS_UNSUPPORTED (02H)
Registers Altered: AH, BP, DS
,.. SF_INIT (AX
=
0200H)
System functions routines. The only function supported is SF_INIT (OOH). The rest of the routines
return with a status of RS_UNSUPPORTED in AH.
The SF_lNIT routine sets up DS and initializes all the variables in the EX-BIOS global data area.
On Entry: BP
=
V_SYSTEM (12H)
AH
=
F_SYSTEM (02H)
AL
=
SF_INIT (OOH)
On Exit: AM
=
Return Status Code
BX
=
DS of EX-BIOS global data area
Registers Altered: AH, BX, DS, BP
Reports the segment where the HP_VECTOR-TABLE is located. This function can only be called
after the V_SYSTEM driver has been initialized.
On Entry: BP
=
V_SYSTEM (12H)
AH
=
F_INS_BASEHPVT (04H)
On Exit: AH
=
Return Status Code
ES
=
Segment address of HP_VECTOR-TABLE.
DS
=
Segment of EX-BIOS global data area
F_INS-.XCHGFIX (AH
=
06H)
Exchanges the values in the registers for a particular entry in the HP_VECTOLTABLE. This
function can be used to replace an existing vector at a fixed location without initialization.
On Entry: BP
=
V_SYSTEM (12H)
AH
=
F_I NS--><CH GFIX (06H)
BX
=
Vector address
DX
=
DS to be exchanged
ES:DI
=
CS:IP to be exchanged
System Drivers 291