Tektronix 5000 Series User Manual

LABORATORY
INSTRUMENT
DIVISION
C
MICROPROCESSOR
DEVELOPMENT
PRODUCTS
( MDP
)
CALCOMP
PART NUMBERS
Due to
the
past
problem
with
bad discs
( Wizard
Issue
10-2 ,
January
25 ,
1980
) ,
a
need
for
head
load
arm
pressure
pads
has
come
about
.
These
pads
are a
felt
material
installed on the
load
arm which
is
part of
the
head
carriage
assembly
.
The
pad
becomes
saturated
with
oxide
from
the
disc
medium
and
eventually
scratches
the disc
.
The
felt
pads
can be
ordered
from
customer
service
under
part number
118-0207-00 and
are
shipped
in
packages
of 5
.
An
error
within the
Calcomp
to
Tektronix
Cross
Reference
List
(
Wizard
Issue
9-25
,
December 21 ,
1979
)
has
surfaced
.
Calcomp
Number
14762-001
should
cross
to
Tektronix
number
118-0248-00
not
118-0284-00 as
shown .
Please
add
and change
the above
part
numbers
to
the above
mentioned
cross
reference .
--Brad Griffin , Kevin King
92-236
, Ext
.
1608 ,
1636
C
1802 EMULATOR
DISASSEMBLY
IRREGULARITIES
The 4 -
bit
registers
labeled
P and
X
hold the
4 - bit
binary
code
that
is
used
to
select
a 16 -
bit
scratch - pad
register . The
4 - bit
register
labeled
P selects the 16 - bit scratch - pad register to be used as the program
counter
.
The 4 -
bit
register
labeled
X
selects
the 16
bit
scratch
pad
register
to be
used as
the
index
register .
When
the
contents
of
the X
ans
p
registers are
equal , the
program
will
not
disassemble
properly
.
During
the process
of
disassembling a
program
,
the
system
processor
has
no
means
of
determining
what
the
contents of
the P
and X
registers
will
be
during
program
execution
. To
work
around
this
problem
,
the
program
will
always
be
disassembled
as
if p
and
X
are
not
equal
.
When
an
instruction
is
executed
that
references
data
pointed
to
by
the
index
register
,
the X
and p
registers
being
equal ,
the data
will
immediately
follow
the
instructions
.
This
occurs
because
the same
16 -
bit scratch
pad
register
is
used
for
bot
register
is
used
for
both
the
program
counter
and
the index
register . In
this
instance
when
the
program is
disassembled ,
the data
that
follows
the
instruction
will
also be
disassembled
as
an
instruction
.
An
example of
this
type
of
occurrence
can be
found
in
the 1802 Assembler and Emulator User's Manual , under the disassemble
command on page 10-10 .
--Kevin
King
,
Brad
Griffin
92-236
,
Ext .
1636 ,
Ext .
1608
-38
June 27 , 1980
Issue
10-13

Tektronix 5000 Series Specifications

General

Brand	Tektronix
Model	5000 Series
Category	Test Equipment
Language	English