With
the
HP
98626 card,
the
Boot
ROM
will use
the
baud
rate, pacing,
and
line characteristics
specified by
the
card's
configuration switches.
The
"handshake type"
bits
in
the
Line Control
Switch
Register are shown as "reserved for future use" in
the
Installation Manual.
The
definition
given these bits by
other
OS's,
and
the
one adhered
to
by
the
Boot ROM
is:
Bit
6
Bit
7
Handshake
type
0
0
ENQ/CK
1
0
XON/XOFF
0
1
no
handshake
1 1
no
handshake
NOTE
HP
98626
cards
are shipped
with
these switches
at
zero.
When
booted
with
ENQ/
ACK
enabled on
the
HP
98626
card
and
XON
/XOFF
en-
abled on
the
terminal,
the
Boot
ROM
sequence stops, waiting forever
for a response.
Since
the
HP
98644
and
HP
98642
cards
do
not
have line characteristic switches,
they
will always
be
assigned
the
following characteristics when used as remote console by
the
Boot
ROM:
•
8
bits/char,
• No parity,
• A single
stop
bit,
• 9600
baud,
and
•
XON/XOFF
handshaking.
The
terminal's
display will
be
the
same as a
monitor
driven by video electronics on a 98561-
66511 processor board.
Keyboard
functions will also
be
the
same, except
that
the
I Break I key on
the
terminal
is
mapped
to
the
I Reset I key on
the
local keyboard.
During
the
self-test of
I/O
cards,
the
card
driving
the
remote interface will
not
be
disturbed.
It
was
tested
earlier
and
passed. Otherwise,
the
interface could
be
disabled.
82
Boot Rom Functions
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