Disabling On Int Branching; Mass Storage Activities - HP 9835A Programming Manual

156 I/O Handling
Disabling ON INT Branching
The branching enabled by an ON INT statement can be disabled using an OFF INT statement
for the same select code. It is effective for the ON INT statement within the same program
environment (main program or subprogram) or for the CALL versions of the ON INT within any
environment.
The statement has the form -
iJFF I t---jT
*
{select code}
where {select code} is a numeric expression for any valid interface select code between 1 and
14, inclusive.
The effect of the OFF INT statement is to disable the ON INT for that select code within the
current environment. If there is no ON INT statement currently in effect for the select code,
then the OFF INT has no effect.
The DISABLE and ENABLE statements work the same way for the ON INT statements as they
do for the ON KEY statements. They should not be confused with the DIR and EIR machine
instructions, which disable and enable the interrupt system.
Mass Storage Activities
For devices meeting the operating system's criteria for mass storage peripherals, the reading
and writing of records is simple.
If a device has been specified in a MASS STORAGE IS statement in BASIC, as in-
1\'11: __ .. _ :::: .,--, .- l::::=C ..
l'
!...
1 il i
'N''': -'.N} ',.N,'·
_ . · 1 1 : ... :J L ...
or is capable of being so specified, then it is possible to use utilities to access it.
There are two utilities involved in reading from a mass storage device - Mm _read _start and
Mm _read _ xfer - and there are two utilities involved in writing to a mass storage device -
Mm _write_start and Mm _write_test. The reading utilities are always used together. So, too,
are the writing utilities.