HP Vectra Technical Reference Manual page 314

On Entry: BP
=
V_SYSTEM (12H)
AH
=
F_SND_TONE (3EH)
BX
=
Frequency 1 to 25000hz
If (BX)
=
0 then tone off.
DX
=
Duration of tone in 10 microsecond increments.
On Exit: AH
=
Return Status Code
Registers Altered: AH, DS, BP
Returns to caller the next string index that does not conflict with the ROM based string indices.
On Entry: BP
=
V_SYSTEM (12H)
AH
=
F_STLGET_FREE_INDEX (40H)
On Exit: AH
=
RS_SUCCESSFUL
BX
=
Next free index.
,.. Registers Altered: AH, BX, DS, BP
Example: This example gets the next string index available to the user.
MOV
MOV
PUSH
INT
POP
MOV
BP, V_SYSTEM
AH,F_STR_GET_FREE_'NDEX
OS
HP_ENTRY
OS
FIRST_FREE_INDEX,BX
,. HP vector 12H
,. function 40H
,. EX-BIOS destroys OS
,. Int 6FH for EX-BIOS
,. Save it for later use.
F_STR-DELBUCKET (AH
=
42H)
Finds a header with the given address and deletes it from the bucket header list.
On Entry: BP
=
V_SYSTEM (12H)
AH
=
F_STLDEL-BUCKET (42H)
DI
=
offset address of bucket header
ES
=
segment address of bucket header
System Drivers 305