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Multitaskers
Prior versions of BNU directly supported various multitaskers
by allowing for "poll" detection on status and character I/O
calls made to the FOSSIL. When BNU sensed a task was "idle",
it automatically gave time slices up during "polling" to
other tasks in the system.
This internal multitasker support has been removed from
BNU.COM and BNU.SYS, and the /X switch is no longer
implemented. However, the current version of BNU does have
'hooks' for an installable driver to link into BNU and carry
out this task. This eliminates much of the unnecessary
"baggage" suffered by users of BNU who do not need this
feature. It also eliminates code made redundant by not
having all multitasker time slice resident at once,
irrespective of which specific multitasker is in use. Only
that code which is actually used and plays a part in support
of the multitasker itself is loaded.
While this current release (1.70) is not accompanied by these
drivers (which are now [October, 1989] in beta test),
multitasking appendages for DESQview/TopView and PC-MOS/386
will soon be available.
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Written by Dave Pearson