Sage II - Page 86

I1legal
InstructLon
ArLthnetlc
error
Prlvllege
error
Reserved
TRAP
Unassl-gned
TRAP
Unasslgned
Interrupt
RAU
Parlty
error
Unknoyn
error
SAGE
rI
SERVICE
MANUAL
[1.0J
ERROR
LOOKUP
LIST
EXCEPTION
ERRORS
(cont)
2
unused
opcodes
(Axxx
&
Fxxx)
1n
whlch
are
currently
undefined
and
thls
error tf
an
attempt
is
made
to
A1so, any
undefined
lnstruction
addressing
mode will
cause thls
Tlrere
are
the
68000
will
give
use
them.
format
or
error.
An attempt
was
made to
dlvlde
by zero
or a
CHK
instruction
was
executed
(
user needs
to
def lne
vector)
or
a TRAPV
instructlon
r^ras
executed
(
user needs
to
define
vector).
User
trled an
lnstructlon
whlch
requlres
SUPERVISOR
mode.
Certain
TRAP locations
have
been reserved
by
Motorola for
future
use and
should
not
be
used,
(
Thls
error
should never
occur.)
There
are
16
trap
locatlons
ln
the
68000,
0-14
of which
are
normally
unasslgned
by
the
Debugger.
Trap
15
ls
used
for
breakpoints
by
the
Debugger.
Traps
8
to
14
are
used
by
the
BIOS.
There are
6
auto-interrupt
vectors.
Norrnally
all
of
them are
unasslgned
by
the
debugger.
Remember when
troubleshooLlng
that
the
parity
chip ltself
could be
the
cause
of
thls
error.
Note
that
the locatlon
shown
1s
where
the
program
was executlng
and is
not
necessarlly
the
locatlon
with
the
error.
Swapptng
a
suspect
ram
chip
lnto
a different
locatlon
can help
isolate
the
error
as it
should
follow
the
chip.
If the
system
wtll
boot
to
a
floppy,
run
the
CYCLER
RAM test.
The
7th
auto-interrupt
vector
1s
non-maskable
and ls
used
for
RAM
parlty
error
reportlng.
Elther
the
program
entered
the
TRAP handler
illega11y
or the
supervisor
stack
was
not
set
to
point
to
valid
ran.
77