HP Vectra Technical Reference Manual page 282

9.5 System Support Driver (lNT 15H)
The extended system support driver (INT 15H) provides functions which allow data to be
transferred to and from extended memory and allow placing the 80286 into its protected mode
of operation. These functions are listed in table 9.1.
Table 9.1
System Support Driver Function Code Summary
INT Function
Function
Hex Equate
Value Definition
15H INT_SYSTEM System Functions Interrupt
0-3
Unsupported
F15_DEVICE_OPEN
BOH
Device Open
F15_DEVICE_CLOSE
81H
Device Close
F15_PROG_TERM
82H
Program Termination
,..
F15_WAIT_EVENT
83H
Event Wait
F15--.JOYSTICK
84H
Joystick Support
F15_SYS_REQ
8SH
System Request Key Pressed
F15_WAIT
86H
Wait Fixed Amount of Time
F15_BLOCLMOVE
87H
Move Block of Memory to/from
Extended Memory
F15_GET-XMEM_SIZE
88H
Get Extended Memory Size
F15_ENTELPROT
89H
Switch to Protected Mode
F15_DEV_BUSY
90H
Device Busy Hook
F15_INT_COMPLETE
91H
Set Interrupt Completed Flag
System Support Driver Function Definitions
F15_DEVICE_OPEN
(AH
=
SOH)
" . Open device for I/O. This is a hook for multitasking systems. Currently the function just returns.
On Entry: AH
=
F15_DEVICE_OPEN (80H)
BX
=
Device Identifier
CX
=
Process Identifier
System Drivers 273