Direct-Connect
Expanders
Two expanders
are
available for these computers. Each connects
to
the
computer
through
a
rigid connection
to
the
motherboard. Only one can be used
at
a time.
HP
98568A Expander, Opt.132
Option
#132
modifies
the
existing
HP
98568A
to
support
the
32-bit DIO-II backplane.
It
adds
eight DIO slots
to
the
system in
the
same way
that
the
HP
98568A
without
the
option adds
DIO slots for
the
Models 310/320,
but
with a different physical connection.
Support
for DIO cards follows
the
same rules as for Models 310/320: interface
cards
may
only
be
located in every
other
slot. Accessory cards may be installed in any slot. And since
the
smaller DIO-RAM (256K
and
1 Mbyte) boards
and
DMA accessories
don't
work, for all
practical purposes this 8-slot expander is really a 4-slot DIO interface expander.
HP
98570A Expander
Here's a new
expander
that
adds two DIO-II system slots
and
four DIO slots. An available
option deletes
the
4-slot DIO backplane
and
converts
the
98570A
to
4 system slots.
HP
9888A Expander
For
16
slots,
the
HP
9888A
is
plugged into any available DIO slot in
the
computer. Up
to
two
HP
9888A expanders are
supported
and
provide
16
functional DIO slots (a
total
of
32 DIO
slots) for interface cards.
Accessory cards using DMA are
not
supported
in
the
HP
9888A Expander.
60
Functional Description