HP Vectra Technical Reference Manual page 283

On Exit: No values returned.
Registers Altered: None.
Close device for I/O. This is a hook for multitasking systems. Currently the function just returns.
On Entry: AH
=
F15_DEVICE_CLOSE (81 H)
BX
=
Device Identifier
ex
=
Process Identifier
On Exit: No values returned.
Registers Altered: None
Terminate Program. This is a hook for multitasking systems. Currently the function just returns.
On Entry: AH
BX
CX
F15_PROG_TERM (82H)
Device Identifier.
=
Process Identifier.
On Exit: No register modified.
Registers Altered: None
Allows a process to wait for at least "x" microseconds before it continues. The process is notified
that the requested amount of time has elapsed when the high bit at ES:BX is set to "1". If
another process is already using this function, driver returns with the carry set. If the return
status is successful (carry flag is clear) the process should poll the byte at ES:BX until the high bit
is set.
274 System Drivers