the
destination
byte
string begins
with
the
byte location
pointed
to by
the
destination
address in
register
1
and
is C bytes in length.
In
this
case,
the source byte is
com-
pared
with
each
byte
of
the
destination
byte
string unti I an
inequality
is found.
TBS
TRANSLATE
BYTE
STRING
(Immediate
displacement,
continue
after
interrupt)
TRANSLATE
BYTE
STRING
replaces
each
byte
of
the
desti-
nation
byte
string
with
a source
byte
located
in a translation
table.
The
destination
byte
string begins with the
byte
lo-
cation
pointed
to by the
destination
address in regi ster
Ru
1,
and
is C bytes in length. The
translation
table
consists
of
up to 256
consecutive
byte locations,
with
the
first
byte
location
of
the
table
pointed
to by
the
displacement
in
TBS
plus the source address in
register
R.
A source
byte
is
de-
fined as
that
which
is in
the
byte
location
pointed
to by the
19
low-order
bits
of
the
sum
of
the
following values.
1.
The
displacement
in
bit
positions 12-31
of
the
TBS
instruction.
2. The
current
contents
of
bit
positions 13-31
of
register R
{source address}.
3.
The numeric
value
of
the
current
destination
byte,
the
8-bit
contents
of
the
byte
location
pointed
to by the
current
destination
address in
bit
positions 13-31
of
register
{Ru
1}.
Affected:
(DBS),
{Ru
1}
Trap: Instruction
exception
translated
(DBS)
-
DBS
The R
field
of
the
TBS
instruction must be
an
even
value
for
proper
operation
of
the
instruction;
if
the
R
field
of
TBS
is
en odd
value,
the instruction traps to location X
'
4D',
instruction
exception
trap.
If
TBS
is
indirectly
addressed,
it
is
treated
as a
nonexistent
instruction.
The
basic
processor
unconditionally
aborts
execution
of
the
instruction (at the time
of
operation
code
decoding)
and
traps to
location
X'40'
with
the contents
of
register R
and
the
destination
byte
string
unchanged.
See IITraps
By
Byte String Instructions" (in this
section)
for
other
trap
conditions.
Note
that
the
check
for
access
trap
conditions
is
done
only
for the source
byte
string.
Case I,
even,
nonzero R field (Ru1=R+l)
Contents
of
register
R:
90 Byte-String Instructions
Contents
of
register R+l:
The
destination
byte
string begins with
the
byte
location
pointed
to by the
destination
address in
register
R + 1 and
is
C bytes in length. The source
byte
string {translation
table} begins with the
byte
location
pointed
to by the
dis-
placement
in
TBS
plus the. source address in register
R.
When the instruction is
completed,
the
destination
address
is
incremented
by
C,
C is
set
to
zero,
and
the
source
ad-
dress remains
unchanged.
Case II, odd R
fi
e
Id
{Ru
1
=R}
Because
of
the
interruptible
nature
of
TRANSLATE
BYTE
STRING, the instruction traps
with
the
contents
of
register R
unchanged
when an
odd-numbered
general
register
is
speci-
fied
by the R
field
of
the instruction word.
Case
III, zero R field
{Ru1=1}
Contents
of
register
1:
The
destination
byte
string begins with the
byte
location
pointed
to by the
destination
address in register 1 and
is
C bytes in length. The source
byte
string {translation
table} begins with the
location
pointed
to by the
displace-
ment in
TBS.
When the instruction
is
completed, the
desti-
nation
address is
incremented
by C
and
C
is
set
to
zero.
TTBS
TRANSLATE
AND
TEST
BYTE
STRING
{Immediate
displacement,
continue
after
interrupt}
TRANSLATE
AND
TEST
BYTE
STRING compares the mask
in
bit
positions
0-7
of
register R with source bytes in a
byte
translation
table.
The
destination
byte
string begins
with
the
byte
location
pointed
to by
the
destination
address in
register
Rul,
and
is C bytes in length.
The
byte translation
table
and the translation bytes themselves
are
identi
cal
to
that
described
for the instruction
TRANSLATE
BYTE
STRING.
The
destination
byte string is
examined
(without being
changed)
unti I a translation
byte
{source byte} is found
that
contains
a 1 in
any
of
the
bit
positions
selected
by a 1 in
the
mask. When such a translation byte
is
found,
TTBS
replaces
the
mask with the
logical
product (AND) of
the
transiation
byte
and the mask,
and
terminates with
CC4
set
to
1.
If
the
TTBS
instruction terminates
due
to
the
above
condi-
tion,
the
count
(C) in register
Rul
is
one
greater
than
the number
of
bytes remaining to be compared and the
destination
address in register
Rul
indicates
the location
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