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HP 900 Series - Page 161

HP 900 Series
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The
state
diagram
shown in Table 4-4 is executed in
the
interrupt
service routine for
the
human
interface
input
device.
N
ate
that
only keys
[[]
through
[TI,
~
through
W ,
and
[[]
through
rn
are
allowed
to
select
an
OS.
Other
keys
are
simply ignored.
This
makes
the
handling
of
all nationalized keyboards
much simpler.
Because
it
is possible
to
find more OSses
than
there
are
lines on
the
display,
the
search scan can
be paused
and
continued by toggling
the
I Return I
key.
The
line
next
to
the
bottom
of
the
screen
indicates
the
current
state
with
one of two messages:
SEARCHING
FOR
A
SYSTEM
(Press
RETURN
To
Pause)
or
PAUSED
(Press
RETURN
To
Continue)"
The
menu will
wrap
around
to
the
top
of
the
screen
and
overwrite itself whenever all available
lines
are
used.
When
the
Boot
ROM is paused, all activity stops. Because
the
keyboard is
polled,
there
may
be
a delay before a key press takes effect.
Boot
ROM Functions
145

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