|
Technical
Reference
57
6
1
13
OFFENDING
ADDRESS
MISSING
This
message
is
used
in
connection
with
the
I/O
CHANNEL
CHECK
and
RAM
PARITY
ERROR
messages
when
the
segment
that
has
caused
the
problem
cannot
be
isolated.
6
1
14
REBOOT
ERROR
When
this
error
occurs
that
requires
you
to
reboot.
Press
any
key
and
the
system
will
reboot.
6
1
15
SYSTEM
HALTED
Indicates
the
present
boot
attempt
has
been
aborted
and
the
system
must
be
rebooted.
Press
and
hold
down
the
CTRL
and
ALT
keys
and
press
DEL.
6
2
Serial
Ports
The
ACEs
(Asynchronous
Communication
Elements
ACE1
to
ACE2)
are
used
to
convert
parallel
data
to
a
serial
format
on
the
transmit
side
and
convert
serial
data
to
parallel
on
the
receiver
side.
The
serial
format,
in
order
of
transmission
and
reception,
is
a
start
bit,
followed
by
five
to
eight
data
bits,
a
parity
bit
(if
programmed)
and
one,
one
and
half
(five
‐
bit
format
only)
or
two
stop
bits.
The
ACEs
are
capable
of
handling
divisors
of
1
to
65535,
and
produce
a
16x
clock
for
driving
the
internal
transmitter
logic.
Provisions
are
also
included
to
use
this
16x
clock
to
drive
the
receiver
logic,
also
included
in
the
ACE
a
completed
MODEM
control
capability,
and
a
processor
interrupt
system
that
may
be
software
tailored
to
the
computing
time
required
to
handle
the
communications
link.
The
following
table
is
a
summary
of
each
ACE
accessible
register
