Tandy TRS-80 Service Manual
CUSTOM MANUFACTUREDINU.S.A. BV RADIO SHACK, A DIVISION OF TANDV CORPORATION
-----------
TRS-aO
®
-----------
TRS-80~
Reproduction
Tandy
prohibited.
preparation
Corporation
or
information
Corporation,
omissions
Multiterminal
of
assumes
contained
-----------lIadlO
Copyright
or
use,
While
this
in
this
1983
AlI
Rights
without
or
any
reasonable
manual
no
liability
manual,
herein.
Interface
Tandy
Reserved
express
portion
efforts
to
assure
or
lIIaeIi
Service
Corporation
of
resulting
from
----------
written
this
have
its
the
Manual
permission
manual
been
accuracy,
from
use
of
is
taken
any
the
in
Tandy
errors
from
the
Multiterminal
Interface
~~~.~~
®
~~~~~_S_e_r_v_i_c_e~M_a_n_u_a~l~
Sec
1/
2/
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
3/
3.1
3.2
3.3
3.4
3.5
TABLE
Description
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation.
Software
Installation...............................
Setting
Connecting
Checking
Enabling
Disabling
Model
Theory
of
USART
Baud
RS-232c
Loopback
Processor
Schematic
Component
Circuit
Circuit
Parts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Requirements......................
Up
Multiple
A
Installation......................
A
Terminal........................
A
II
to
Operation.............................
Circuitry
Rate
Generator
Interface
Circuit
Interface........................
8000198
Layout
Trace,
Trace,
List.................................
OF
Terminal
Terminal
16
Conversions
..•.......................
..................•........
.......•...•..............•
Component
Solder
CONTENTS
TerminaIs..............
To
The
Computer......
Side
Side
Page
10
10
Il
Il
16
16
18
18
21
23
24
25
26
3
3
6
7
7
9
4/
Troubleshooting
----------lIadI8
lhaelÏ
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29
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_M_u_l_t_i_t_e_r_m_i_n_a_l_I_n_t_e_r_f_a_c_e_
TRS-SO
®
S_e_r_v_i_c_e_M_a_n_u_a_l
__
No.
2-1
2-2
2-3
3-1
3-2
Description
Multiterminal
Installation.
DIP
Switch
Typical
System
Programming
Programming
Progralnming
Programming
Baud
Rate
LIST
Interface
OF
Board
FIGURES
• • • • • • • • • • • • . • • • • • • • • • • • • • • • • • 4
Settings............................
Installation....................
LIST
Parameters
Parameters
Parameters
Parameters
Generator
OF
TABLES
(Page
(Page
(Page
(Page
••••••••••••••••••••••••••••
Page
l
of
4 ) . . . . . . • . . . .
of
2
3
4
4 ) . . • . . . . . . . .
of
4 ) . . . . . • . . . . .
of
4 ) . . • • . . • • . . .
No.
5
8
12
13
14
15
17
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__
M_u_l_t_1_et_e_rl!Wlllm_i_n_a_l_I_n_t_e_r_f_a_c_e_
1/
General
The
Multiterminal
16/16B
This
capability,
capability,
access
This
results
advantage
The
Multiterminal
RS-232C
Peripheral
The
normal
duplex,
from
50
driven.
an
interrupt
retrieved
to
interface
allows
to
the
in
of
a
seriaI
Processor.
mode
asynchronous
to
9600.
On
the
is
from
Interface
combined
features
a
cost
shared
Interface
interface
of
The
reception
created
a
memory
with
up
to
contained
savings
data
operation
transmission
computer
and
buffer.
TRS-SO
Board
up
to
three
with
six
to
or
the
independent
per
base.
Board
the
as
interface
transmission
the
®
(26-6013)
additional
XENIX
in
a
terminal
is
basically
a-bit
defined
with
character
OS
operators
single
Z80A
by
a
baud
is
Service
al10ws
multitasking
Model
and
a
Model
software
rate
interrupt
of
any
is
stored
Manual
the
terminaIs.
to
have
16/16B.
the
added
three-port
16/16B
is
range
character,
to
Model
full
or
The
Multiterminai
Cage
assembly
Multiterminal
chain,
noted
its
in
action.
positions
slot.
part
as
cage
(J7)
If
of
"None".
in
•
the
the
Priority
1
2
3
4
5
6
7
8
9
priority
the
If
is
a
which
Interface
chart
one
of
not
board
interrupt
Physical
Model
Pos.
Interface
is
internaI
Board
position
below
the
boards
present,
position
cycle,
positioning
16B
is
Description
ARCNET
Hard
Multiterminal
Graphics
Video/Keyboard
256K
256K
256K
16
Bit
Board
in
to
preserve
then
is
its
from
Disk
Memory
Memory
Memory
CPU
is
to
the
must
be
the
listed
the
other
not
critical,
priority
of
the
bottom
Interface
Interface
Board
Board
Board
Board
mounted
Computer.
in
card
this
in
the
the
board
Interface
in
the
the
interrupt
cage
must
daisy-chaining
first
boards
i.e.
move
it
position
in
the
(JI)
to
the
Card
Since
be
three
up
is
is
card
top
priority
the
as
a
not
noted
1
2
3
None
None
None
None
None
None
a
----------lIadlo/haelÏ
---------
- l -
Multiterminal
Interface
TRS-SO
®
S_e_r_v_i_c_e_M_a_n_u_a_l_
----------lIadlelllaell----------
- 2 -
__
M_u_I_t_i_t_e_r_m_1_'
2/
Installation
n_a_I_I_n_t_e_r_f_a_c_e_
TRS-SO
~-'
Service
Manual
Included
installing
PCB
in
allows
terminaIs
used
Manual
2.1.
The
which
higher.
01.03.00.
If
necessary
(Catalog
a
If
necessary
(Gatalog
by
only
you
version
you
in
and
the
Model
you
to
to
aIl
for
operating
Software
current
supports
You
already
to
No.
01.03.00
do
not
to
No.
the
following
interconnecting
16
interconnect
the
computer
terminaIs.
Requirements
operating
this
must
modify
700-2066)
purchase
700-2052).
have
have
upgrade
System.
the
pages
Radio
instructions
board
the
it
Refer
XENIX
using
which
XENIX
the
Shack
so
your
XENIX
are
the
Computer.
as
many
that
to
system
is
TRS-XENIX,
system
Operating
a
software
modifies
Operating
instructions
Multiterminal
as
five
a common
the
TRS-XENIX
for
the
offered
to
a
Version
This
additiona1
data
system.
by
Version
at
System,
update
1.1
System,
01.03.00
Operator's
Radio
least
diskette
or
1.2
it
for
Interface
option
base
01.03.00
it
Shack
a
is
system
will
Core
may
version
be
or
to
be
System
2.2.
The
installation
its
modifications
communication
The
or
rear
the
Installation
following
function
Multiterminal
16B
in
the
cover
top
cover
instructions
of
to
required
between
card
is
removed
from
the
Mu1titerminal
ensure
Interface
cage
the
proper
to
the
it
and
assemb1y.
from
Model
----------IIMIOIhaeIl----------
- 3 -
are
operation,
Main
the
Board
the
16.
given
Interface
remote
is
Model
to
allow
Terminal
termina1(s).
installed
It
is
16B
proper
Board,
and
perform
to
al10w
in
accessible
Case
Assemb1y,
check
a
Model
when
out
16
the
or
__
M_u_l_t_1_et_e_r_m_1_
e
n_a_l__I_n_t_e_r_f_a_c_e_
TRS-SO
®
Service
Rear View
Manual
Multiterminal
Interface
Board
Rear
View
Model16
68000
CPU
16-Bit Memory
16-Bit Memory
::>
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0
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Q)
~
~
co
co
-e
ca ca
0
ca
0
Q)
'"C
:>
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u
0
0
0
co
co
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0
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Q)
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ai
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Q)
(J
't
Q)
~
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ni
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°ê
Q)
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::I:
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en
ca
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e
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c
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en
ë
>
Q.
Q.
0
Li:
Option
Video Board
Multiterminal Interface
Hard Disk
Figure
2-1.
----------lIadlo
Multiterminal
or
Upgraded Model 12
Interface
IlIaelÏ----------
- 4 -
Board
Installation
Multiterrninal
Interface
~~~.~~®~~~~~_s_e_r_v_i_c_e~M_a_n_u_a_l~_
1.
Model
Model
2.
Rear
Cover
16
Turn
allow
the
access
unscrewing
rear
Insert
on
the
Multiterminal
2-1.
16B
Turn
allow
the
access
mounting
Lift
out
down.
Remove
the
board
the
card
to
connector(s)
DIP
switch
noted
in
connector
Multiterminal
chain.
the
must
board
be
Therefore,
in
Removal
computer
to
the
top
computer
to
screws
on
the
card
cage
be
to
installed.
on
SI
must
Figure
slot
Interface
and
JI.
JI
if
so
the
two
cover
so
the
at
bot
holding
allow
the
2-2.
as
shown
no
that
top
the
cover.
mounting
to
gain
Interface
that
rear
the
tom
the
cover.
10wer
of
the
brackets
the
Attach
Multiterminal
be
set
for
Slide
in
board
there
The
other
must
Multiterminal
boards
rear
is
Remove
screws.
access.
PCB
as
rear
is
Remove
part
cover
of
plate
from
Multiterminal
the
cable
Interface
the
proper
the
board
Figure
must
be
2-1.
be
no
are
facing
the
Lift
noted
facing
the
the
either
into
The
in
empty
Interface
present.
you
top
up
and
in
you
two
rear
and
cover.
pull
side
Interface
end(s)
Board.
operation
the
the
interrupt
slots
to
cover
ta
Figure
ta
of
to
between
board
by
the
the
The
as
OFF
----------lIadI8
ON
S1-0N
S2-Sa -
InllJ
Figure
J1
Jumpers must
E7-E8
DIP Switch
Inl
OFF
2-2.
J2
be
El0-E11
DIP
- 5 -
J3
in place
E13-E14
Switch
Settings
Ihaell-----------
Multiterminal
Interface
TRS-SC
®
Service
Manual
3.
2.3.
The
of
terminaIs
itself
capabilities.
The
terminaIs.
and
DT-I's
a TRS-XENIX
a
and
paragraph
other
Loosen
to
unit(s)
Door
Allow
provide
Xenix
terminal
console
expects
DT-l
proceed
the
Setting
to
Adds25
to
than
the
Rear
between
and
tighten
enough
an
Up
system
types
are
connected
the
terminal's
is
automatically
TRS-XENIX
the
emulation
file
the
console,
directly
2.6).
a
DT-l,
screws
Door.
the
cable
internaI
Multiple
is
programmed
--
but
terminaIs
called
to
If,
however,
you
which
Feed
Strain
the
screws
to
the
loop.
TerminaIs
the
to
it
particular
calls
you
mode.
/etc/ttytype.
just
enabling
have
mount
the
inside
to
system
so
set
them
connect
That
follow
you're
to
let
the
cable(s)
Relief
mounting
of
accommodate
has
that
to
the
your
it
characteristics
accommodate
"Adds25"
to
information
connection
terminal
connecting
TRS-XENIX
Strain
from
Bracket
the
the
to
know
can
be
If
you're
Relief
the
and
Bracket.
bracket
a
wide
what
calibrate
two
terminal
set
to
is
connecting
instructions
(see
a
know.
Bracket
remote
the
Rear
to
range
kind
and
DT-I
type,
the
stored
terminal
of
in
A
file
commonly
and
codes
To
let
edit
names.
--
the
just
called
used
TRS-XENIX
/etc/ttytype
At
as
/etc/terrncap
terminaIs.
for
the
NAME
VT
100
VT
52
ADM
ADM
ADDS
3a
5
Televideo
that
soon
25
know
point,
as
terminaIs
910
what
file
TRS-XENIX
you've
stores
The
following
pre-configured
kind
to
enabled
of
include
can
the
characteristics
CODE
vt100
vt52
adm3a
adm5
tvi910
adds25
terminal
one
work
it.
list
gives
in
/etc/termcap:
you'll
of
the
with
above
your
of
the
be
using,
terminal
aIl
names
---------lIadlelhaell---------
- 6 -
__
M_u_1_t_1._'
t_e_r_m_i_n_a_1_I_n_t_e_r-f-a-c-e_
TRs-aD
®
S_e_r_v_i_c_e_M_a_n_u_a_I
__
2.4.
First,
If
it
RS-232
(Cat.
1.
2.
3.
4.
If
the
RS-232
Connect
RS-232
Connect
of
Connect
Channel
If
insert
Channel.
the
Multiterminal
Connecting
check
is
cable
No.
the
the
terminal
cable
which
either
(Cat.
26-1496)
one
jack.
the
null
the
A
computer
a
assembly.
A
Terminal
connector
SeriaI
No.
for
end
of
other
modem
adapter's
or
B
of
requires
Terminator
connects
Interface
To
Channel
26-4403)
each
end
adapter.
your
the
Plug
to
terminal.
RS-232
of
male
computer.
one
pca,
The
you're
A
and
the
plug
it
into
of
Computer
using
or
B,
a
cable
cable
to
(check
any
the
you
will
you
null
to
to
either
the
unused
three
(see
for
the
will
modem
the
the
owner's
SeriaI
connectors
need
Figure
terminal.
need
adapter
terminal's
female
SeriaI
manual),
only
the
2-3)
an
plug
on
2.5.
Correct
when
XENIX
Type
Response
There
will
*
Checking
the
produce
in
disable
will
appear:
disable:
disable:
OX=one
For
Installation
installation
following
the
the
following
ttyOX
be
no
ttyOX
/etc/ttys
of
the
example,
of
commands
noted
command*:
(enter)
response
is
tty
terminaIs,
tty04.
the
Multiterminal
typed
responses.
or
already
not
updated
the
disabled
into
following
either
the
Interface
computer
error
(which
4,
5
or
message
is
OK)
6.
is
ensured
running
----------lIadI8
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