Bootstrap Switch Settings for ROMs (E82 and E87) Labeled 158A2 and 159A2
3-24
8-8
8-8
9-1
Basic PDP-8/ A Troubleshooting
.......................
.
v
CHAPTER 1
INTRODUCTION
There are two basic types
of
computers in the PDP-8/ A family. The first type
is
the
PDP-8/
A, which uses
semiconductor memories (MS8 and MR8). The second type
is
represented by a series
of
computers, each
of
which uses 8K or
16K
core memory (MM8); this series consists
of
the 8A400, 8A420, 8A600, 8A620, 8A800, and
8A820 computers. When a reference applies to both types
of
computers, the designation
"PDP-8/
A"
is
used.
"PDP-8/A
semiconductor" refers to the semiconductor memory computer, while "8A400," for example, refers
to a specific core memory machine and
"8A"
refers to the core memory machines in general.
The
PDP-8fA
Operator's Handbook includes instructions for packing, unpacking, and installing a PDP-8/A
miniprocessor. All computers and modules are tested thoroughly at DIGITAL's manufacturing facilities before
they are shipped. However, many switches and jumper wires can be arranged
by
the customer for specific pur-
poses; furthermore, there
is
a need both to verify system interconnections and site preparations, and to detect
possible hidden damage incurred during shipping. Consequently, a number
of
initial operating tests are also
included in this handbook.
A
PD
P-8
/ A basic system can comprise a variety
of
components. The following three basic systems are the most
common:
1.
A basic PDP-8/ A, * a memory, and a Limited Function Panel. (This computer does not include a KM8
Extended Memory
Option module and, hence, must be a PDP-8/ A semiconductor.)
2.
A basic PDP-8/ A, a memory, a Limited Function Panel, a KM8 Extended Memory Option module,
a DKC8-AA
I/O
Option module, and a Programmer's Console. (Chapter 5 describes operating tests
for this arrangement.)
3.
A basic system as described in
2,
but accompanied by a teletypewriter and diagnostic** programs.
(Chapter 7 describes operating tests for this arrangement.)
*A
basic PDP-8fA
is
defmed as a Central Processor Unit (CPU) and a chassis assembly (chassis, Omnibus, and power supply).
**Diagnostics are test programs written
to
fmd faults
in
the logic. The PDP-8fA programs are supplied
on
paper tape. Diagnostic pro-
grams are optional and may be ordered from
the
Software Distnoution Center, 146 Main St., Maynard,
MA,
01754.
1-1
2.1
UNPACKING
INSTRUCfIONS
CHAPTER 2
PACKING AND UNPACKING
INSTRUCTIONS
All PDP-8
fA
computers are packaged in two containers; the inner container holds the computer and some kind
of
protective material.
The
steps
in
this section
are
sufficiently general
to
apply to any PDP-8f A.
To
unpack the PDP-8f A computer, proceed as follows.
i.
Open the outer carton and remove the inner carton.
2.
Open the inner carton.
3.
Carefully remove the cardboard from the top and sides
of
the computer.
4.
Carefully remove the computer from the box.
5.
Inspect the computer for damage.
If
the computer
is
damaged, notify the carrier immediately.
6.
Unpack any other boxes included in the shipment.
7.
Check that all equipment, software, manuals, etc., are present as specified on the shipping list inside
the carton.
8.
Save the cartons
and
packing material
to
use if the PDP-8f A is later repacked.
9.
Refer
to
Chapter 4 for PDP-8f A installation procedures.
2.2 PACKING INSTRUCTIONS
Two types
of
packages are used for the PDP-8f A computers. The type used and the applicable packing instruc-
tions depend on the type
of
PDP-8f A chassis assembly.
2.2.1 BA8-C Chassis Assembly
The 8A420, 8A620, and 8A820 computers use a BA8-C chassis assembly (20-slot Omnibus). Figure
2-1
illustrates
the packing procedure. The computer
is
first placed in the inner container (9905417), the empty space
is
filled
with plastic protective material
(AIR
CAP, SD-120), and the container
is
sealed.
The
sealed inner container
is
surrounded with protective foam material which
is
then enclosed by the two telescope caps. Finally, the package
is
secured by two plastic straps.
2-1
FULL
TELESCOPE
CAP
(9905647)
FOAM
PAD
(9905648)
PACKAGED
OPTION
IN BOX
(9905417)
FULL
TELESCOPE CAP
(9905647)
Figure
2-1
8A420, 8A620, 8A820 Packaging
2-2
FILL
VOIDS I N CARTON
WITH
AIR
CAP
SD-120
FOAM CORRUGATED
SIDE
WALL
ASS'Y
(9905641
)
ust:
(2)
PLASTIC
STRAPS
(1)
IN
EACH
DIRECTION
TO HOLD CONTAINER
TOGETHER.
08-1789
2.2.2 Other
PDP-8/
A Chassis Assemblies
CAUTION
The G8016 Regulator Board assembly used on
PDP-8/A
semiconductor computers contains a battery. This battery,
while not
of
sufficient t'oltage to cause electrical shock,
represents a possible hazard
if
shorted.
If
repacking this
type computer, ensure that there is
no
loose metal, such as
solder, wire, or sheet metal parts, inside the cabinet.
The PDP-8f A semiconductor computer and the 8A400, 8A600,
and
8A800 computers use a chassis assembly
that
has a
lO-s10t
or
12-s10t
Omnibus.
To
pack these computers, proceed as follows.
1.
Place the computer in the smaller
of
the two shipping cartons with the back (side with power cord)
of
the computer against the side
of
the carton.
2.
Place the beveled die-cut sheet with foam protector (part number
9905675)
in front
of
the computer
(Figure 2-2).
If
the Limited Function Panel
and
a pop panel are
on
the computer, the beveled edge
should be down inside the carton.
If
the computer has a Programmer's Console, the beveled edge
should be up
so
that
the cut-out in the cardboard fits the Programmer's Console.
3.
Place the die-cut sheet with foam saddle (part number
9905677)
downward over
the
computer.
The
end with two pieces
of
foam should be fitted around the fans and the other end should be positioned
so that the cardboard fits behind the cabinet mounting flange and the foam
is
against the side
of
the
carton.
4.
Close the flaps and seal the carton with tape.
5.
Surround the sealed carton with protective foam material and enclose with telescope caps (Figure
2-
3).
6.
Strap in both directions using steel
or
plastic strapping.
2-3
DIE
-CUT
WITH FOAM BEZEL
SHEETS
PROTECTOR
(9905675J
DIE-CUT SHEET
WITH
FOAM
(9905667]
SADDLE
Figure 2-2 PDP-8f A Computer Packaging (Inner)
REGULAR SLOTTED
CARTON
(9905649)
08-1494
2-4
FULL
TELESCOPE
CAP
(9905662)
FOAM
PAD
(9905663)
PACKAGED
OPTION
IN BOX
(9905649)
FOAM
PAD
(9905663)
FOAM CORRUGATED
SIDE
WALL
ASS'Y
~
(9905661)
~
Figure
2-3
PDP-8f A Computer Packaging (Outer)
,
2-5
08-1790
CHAPTER 3
SYSTEM DESCRIPTION
3.1
GENERAL
A
PDP-8/
bottom with three switches and three indicators) and the Programmer's Console. The Programmer's Console can
be located remotely from the chassis; in such a case,
is
attached instead. Both the panel
them
panels
A computer
off
the latches.
are
removed, the module boards
is
pictured in Figure 3-1, which shows
(Do
not
both
the Limited Function Panel (the panel on the
or
when the system does not include a console, a blank panel
and
the console are latched to the chassis; they can be removed by pulling
pull too vigorously; the panels are attached by cables to interior points.) When the
are
visible.
Figure
3-1
PDP-8/A
3-1
7288-5
Computer
The
PDP-SI
A computers have three different mechanical assemblies
that
can be characterized by
the
number
of
available Omnibus slots;
that
is, the
PDP-SI
A semiconductor
computer
assembly
has
a IO-slot Omnibus, while
the
SA
computer assemblies have either a 12-slot
or
a 20-slot Omnibus. Table
3-1
relates the various PDP-S I A
computers
to
some
of
the basic system components.
Note
that
the
SA400 can be considered to be the basic SA
computer,
having a core memory,
an
SA
CPU,
and
a 12-slot Omnibus. Thus,
the
SA420 differs only in
that
it has
a
20-slot Omnibus; the SA600 differs in
that
it has a
PDP-S/E
CPU;
the
SA620 differs in
that
it has a
PDP-S/E
CPU
and
a 20-s10t Omnibus; the
SASOO
differs
in
that
it
has
an
FPP-SA
(not
indicated in Table 3-1);
and,
the
SAS20 differs in
that
it has an FPP-SA
and
a 20-s10t Omnibus. Also, note
that
only the
SA
computers
that
use a
PDP-S/E
CPU
can be expanded.
Table
3-1
PDP-8fA Computer Assemblies
Computer
CPU
Memory *
Basic Power Assembly
Omnibus
Expandable ?
PDP-8fA
KK8-A
Semiconductor
H763 H9192
(1
O-sIot)
No
8A400
KK8-A
Core
H9300
H9194 (12-s10t)
No
8A420
KK8-A
Core
BA8-C
H9195 (20-slot)
No
8A600
KK8-E
Core
H9300 H9194 (12-slot)
Yes -as
many
as
20
slots can
be
added
8A620
KK8-E
Core
BA8-C
H9195 (20-slot)
Yes -as
many
as
20
slots can
be
added
8A800
KK8-A
Core
H9300
H9194 (12-slot)
No
8A820
KK8-A
Core
BA8-C
H9195 (20-slot)
No
* A
KMS-A
(or
KMS-E)
Extended Memory Option module must
be
included
in
all the
SA
computers, since their basic memory capacity
is
SK
or 16K; the
KMS
is
optional with the PDP-Sf A semiconductor computer, since the basic memory capacity can be less than,
greater than, or equal to 4K.
In addition to the
CPU,
most
DIGITAL
PDP-S/E
options
will
operate
with the
PDP-S/A
computers. The
following will not:
1.
KPS-E Power
Faill
Auto-Restart
option
2.
DKS-EA Line Frequence Real-Time Clock
option
3.
MMS-E
4K
Core
Memory
4. MMS-EJ SK
Core
Memory
The
KES-E
option
(Extended Arithmetic Element)
and
the
TDS-E
DECtape
Control
will
operate
only with the
SA600 and SA620 computers.
Moduies
can
be inserted in almost any
PDP-SI
A Omnibus slot. There are, however, some restrictions
and
these
are summarized in Table 3-2.
Notice
that
an MS320 module (Bus Loads)
is
inserted in slot 1
of
the
SA600
and
SA620 computers. This module
must be modified before it can be used in the
SA600 and SA620 computers.
If
the modification has been accom-
plished, R55 (Figure 3-2) will have been removed;
if
R55 is present, carry
out
the procedure outlined in
DEC
ECO
MS320-00007.
3-2
Table 3-2
PDP-Sf A Computers, Dedicated Omnibus Slots
PDP-8/ A Semiconductor,
Omnibus Slot SA600 SA600 + KES-E SA620
SA620
+ KES-E
SA400, SA420,
SASOO,
SAS20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
IS
19
20
NOTES:
I
M8320
M8316
M8317
I
I
I
M8300
I
M8310
M8330
M8320
I
M8316
M8317
I
M8300
M8310
M8341
M8340
I
M8330
I
M8320
M8316
M8317
MS300
MS310
MS330
M8320
M8316
M8317
MS300
MS310
MS341
MS340
MS330
I
I
I
I
1. MS316 and MS317 are interchangeable in slots 2 and 3.
ON;:: ASR/KSR 33 DR35 fIlter in (across SLU 20 rnA REC'V Leads.
ON
if
Baud Rate
OFF -filter out
ON = TS1
OFF
not
run at this baud rate. This setting
clears DATA AVAIL flip-flop in Parallel I/O Section
= DATA AVAIL
is
110
or
not
is
below.)
cleared by TSI
not
to be used.
3-21
3.4.7 KMS-A Extended Option Board
The KMS-A, shown in Figure 3-16,
is
Power-Fail/ Auto-Restart
Bootstrap Loaders - Provide commonly used
and
Memory Extension
Timeshare Control
If
you are using paper tape under control
strap switches, no Auto-Restart, and timeshare enabled,
set the following switches
S2-1, S2-5 through S2-7; set the following switches
Sl-5 through Sl-7, S2-2 through S2-4,
a hex module (MS317)
I/O
loaders
ON:
SI-1 through SI-4, SI-S,
that
combines the following options:
of
the boot-
OFF:
and
S2-S.
Figure 3-16 KMS-A (MS317) Extended
3-22
Option
7299-1
Board
Other
switch settings for
the
KM8-A
are listed in Tables 3-10
through
3-14.
Program
S2-5
Hi-Lo
RIM*
ON
RK8-E*
ON
TC08*
ON
RF08/DF32D*
OFF
TA8-E*
OFF
NOTE
There
are
three types
of
bootstrap
ROMs
used on the
KM8-A. E82 and E87 have different labels for the different bootstrap
ROMs.
Switches on modules
that
have E82
and E87 (Figure 3-16) labeled 87A2 and 88A2 should be
set according to Table 3-11.
If
E82 and E87 are labeled
158A2 and 159A2, use Table 3-12 for switch settings.
For
CL8
systems using the RX8-E, E82 and E87 are labeled
156A2 and 157A2; use Table 3-13.
(If
Table 3-13 is used,
Auto-Restart address
0 must be selected, i.e., S2-2 is
OFF,
S2-3 is
OFF,
and S2-4 is
OFF.)
Restart
Address
0
200
2000
4200
S2-6
ON
OFF
OFF
ON
ON
Table 3-10
Auto-Restart Select Switch Settings
S2-2
S2-3
OFF OFF
OFF
ON
ON
OFF
ON ON
Table
3-11
Bootstrap Select Switch Settings
for
ROMs
Labeled 87 A2 and 88A2
S2-7
S2-8
SI-1
ON
OFF
ON
ON
OFF
ON
OFF
ON
OFF
ON
ON
ON
ON
OFF
ON
S2-4
OFF
OFF
OFF
OFF
SI-2
ON
OFF
ON
OFF
OFF
*May
only be used with 4K
of
Read/Write Memory in Field
O.
Program
S2-5
Hi-La
RIM
ON
RK8-E
ON
RX8-E
ON
RF08jDF32D
OFF
TA8-E
OFF
Table 3-12
Bootstrap Select
Switch Settings for
ROMs
Labeled 158A2 and 159A2
S2-6
S2-7
S2-8 SI-1
ON
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
I
ON
OFF
ON
OFF
OFF OFF
3-23
SI-2
ON
OFF
ON
ON
ON
Memory
SI-3
Address
ON
7737
ON
0024
ON
7613
OFF 7750
OFF
4000
Memory
SI-3
Address
ON
7737
ON
0024
ON
0033
OFF
7750
OFF
4000
Program
S2-5 S2-6
RX8E TEST
ON
ON
Feature
Bootstrap Enabled And Auto Restart
Disabled
Bootstrap Enabled And Auto Restart
Enabled
Bootstrap Disabled And Auto Restart
Enabled
Bootstrap Enabled And Auto Restart
Disabled
Bootstrap Enabled And Auto Restart
Disabled
Bootstrap And Auto Restart Disabled
Time
Share Enabled
Time
Share Disabled
Table 3-13
Bootstrap Select Switch Settings
for
ROMs Labeled 156A2 and 157 A2
S2-7 S2-8
SI-1
SI-2 SI-3
ON
ON ON
OFF
ON
Table 3-14
Bootstrap/Auto-Restart
Switch Settings
Start Switch
or
Activating
Signal
BOOT
Key
BOOT Key or
AC
OK*
ACOK*
I
ACOK*
AC
OK* or BOOT Key
I
Bootstrap Activated In Run Or Stopped State
Bootstrap Activated In Stopped State Only
Not Used
*Starts if power voltage becomes adequate.
3-24
First
First
ROM
Memory
Address
Address
004
0000
Switches
SI-6
SI-7 SI-8
OFF
OFF
ON
ON
ON
ON
ON
ON OFF
ON
OFF
OFF
ON
OFF
ON
OFF
OFF OFF
S2-1
OFF
ON
SI-4
OFF
ON
SI-5
3.4.8 Semiconductor Memory Power Supply
The H763 Semiconductor Memory Power Supply can supply
20 A
at
5.0
V.
It
will
support
only semiconductor
memory
(RAM
and ROM).
The
regulator (08016, shown in Figure 3-17) plugs into a dedicated backplane slot
near the
bottom
of
the chassis. The power supply has battery
backup
for power failures.
The
machine will be
totally supported for approximately
30-40 seconds after
an
ac line failure.
~
nun
n
+5 v ADJUST
CAUTION
This area
of
the
G8016
is
normally covered
with
an
insulating shield. Removal
of
the
shield exposes
the
battery
terminals.
Should
you
accidentally
short
these terminals
with
a ring
or
watchband,
you
W2 could receive a
burn.
POWER
FAILUl)
POWER
FAIL
DOWN
7015-11
Figure 3-17 Semiconductor Memory Regulator Board
(08016)
3-25
To
enable control
the
ON-OFF
to the
identified in Figure 3-3.)
All PDP-8f A dc power supply outputs are provided to
drive logic inside the chassis. DIGITAL is not responsible
for the performance
used outside of the chassis.
Refer to Appendix D (Omnibus Loading Chart) to ensure
current rating is not exceeded.
MASTER
of
the
PDP-8/
switch, set
(to the right) position. (The switch
the
NOTE
of
the
CAUTION
A system power from
MASTER/SLAVE
PDP-8f
A
if
any dc power is
switch
is
I n the 8A computers, the
ON
/OFF,
Panel; remove the panel
it
is
3.4.9 Core Memory Power
The core memory power supply supplies the following voltages
The G
board
PANEL
shown in the
+5 V at
-5
+
-15 V at
+20 V at
8018
slot
25
V at 2 A
15 V at
2 A
2 A
4 A
regulator (Figure 3-19) plugs into a dedicated backplane slot near the
is
pictured in Figure 3-5.)
MASTER
A
MASTER/SLAVE
LOCK,
and
to
gain access
position (to the right when viewing the front
Supply Regulator
switch is mounted
BOOT switches. This
to
the
MASTER/SLAVE
board
on
the printed circuit
is attached to the rear
switch. The switch
of
at
the currents specified:
the
is
switch).
bottom
board
that includes the
of
the Limited Function
illustrated in Figure 3-18;
of
the chassis. (The
3-26
I
MASTER/SLAVE
SWITCH
Figure3-18 8A
Master jSlave S .
wItch
3-27
08-1787
+5V
CIRCUIT
BREAKER
ADJUSTMENT
TOOL MUST
ENTER HERE
FOR
+5V
ADJUSTMENT
POWER
OK
LIGHT
(LIT
WHEN
ALL
DC
VOLTAGES ARE
PRESENT)
ADJUSTMENT
TOOL MUST
ENTER HERE
FOR
+20
VOLT
ADJUSTMENT
+5
V ADJUSTMENT
-5 V FUSE
POWER
POWER
+20 V
FUSE
FAIL
(4A)
(2.5 A)
FAIL
UP
DOWN
Figure 3-19 Core Memory Regulator Board (GSOlS)
3-28
+15 V
FUSE
-15 V FUSE
(2.5 A) (2.5 A)
7404-1
3.4.10 Limited Function Panel (Figure 3-20)
The Limited Function Panel has three external switches and three indicator lights as defined below. (The MAS-
TER/SLA
VE switch
is
mounted in the rear
of
the panel for 8A computers.)
7288-3
Figure 3-20 Limited Function Panel
3-29
Lights
The
POWER
light, which indicates
that
the
PDP-8/
A is operating
on
ac power.
The
RUN
light, which indicates
that
the
PDP-8/A
RUN
flip-flop is set.
The
BATTERY
CHARGING
light indicates either
that
the power supply
battery
is
being charged
(PDP-
8/
A semiconductor computer)
or
that
both
G8018 regulators
are
operating
properly (8A420, 8A620,
and
8A820 computers). The light
is
present
on
the
8A400, 8A600,
and
8A800 computers
but
is
not
used.
Switches
The
ON-OFF
switch, which
turns
ac power
on
when in the up position. (This switch will
not
turn
battery
power on unless ac
is
present.)
Turn
power
off
before removing
the
power
cord
from the wall receptacle;
otherwise, the
PDP-8/
A will run
on
battery
power
for
as
long as the battery lasts.
On
those systems having a Programmer's Console, the
PANEL
LOCK
switch disables the following
switches:
HLT
ISS, E
NEXT,
E THIS, D
THIS, D NEXT,
LA, LXA,
INIT,
BOOT,
and
RUN.
The down
position activates the
Programmer's Console; the up position panel-locks the console.
The
BOOT switch initiates the
bootstrap
function (if it
is
enabled) on the
KM8-A
Extended
Option
Board
(M 8317).
It
is
normally left
in
the
down
position.
The
BOOT
switch
is
not
affected by
PANEL
LOCK.
3.4.11 KC8-AA Programmer's Console (Figure 3-21)
The
Programmer's
Console
has
7-segment
LED
displays
of
the Extended
Memory
Address (EMA), Memory
Address (MA),
and
the Status Register.
The
console can be located up
to
15
ft
from the
PDP-8f
A. Two BC08R
cables connect the console
to
the M8316 module (JI and 12).
;
~sooo6
N£XT
STATE
MD
LXA
0CDCDCDO
ORUN
OSTATE
OMD
THIS
BUS
STATUS
SR
INIT
CDCDCDCDOI
NEXT
AC
MQ
HLT/SS
RUN
I
00000
)
_....:::
--==--:.~..:::;::._~..;::.l
Oaus
o
STATUS
OSR
08-1121
Figure 3-21 KC8-AA
Programmer's
Console
3-30
CHAPTER 4
INSTALLATION AND INITIAL
POWER
TURN-ON
4.1
ENVIRONMENTAL
AND
POWER
REQUIREMENTS
Recommended
operating
conditions for the
PDP-Sf
A are an
ambient
temperature
of
5°
to
50° C
(41
° - 122°
F)
and
a noncondensing relative humidity
of
10-95 percent. Voltage requirements
are
90-132 Vac single
phase
(using approximately 3.2 A),
or
lSO-264 Vac single phase (using
approximately
1.6
A). Line frequency
may
be
49-51 Hz
or
59-61 Hz, depending
on
the
power
transformer
used in
the
power
supply. Check
the
label
at
the
rear
of
the
computer
to
determine the correct voltage
and
frequency.
WARNING
Ensure
that
the ac outlet provides a non-current-carrying
ground.
4.2
INITIAL
POWER
TURN-ON
After unpacking the computer, allow
at
least 30 minutes for
the
machine
to
stabilize
to
ambient
temperature
before applying power. This time should be increased
to 1 hour
or longer when the difference between storage
or
shipping
temperature
and
the
operating
ambient
temperature
exceeds 30° F (17° C).
Install
the
equipment, using the following procedure:
1.
Check switch settings
on
all modules. (See instructions in
Chapter
3.)
2. Ensure
that
the regulator circuit
breaker
is
ON.
(The
breaker
is pictured in Figure 3-4.)
3.
Turn
OFF
the
ON/OFF
switch
on
the
Limited
Function
Panel (Figure 3-20).
4. Ensure
that
all ac power is received from
the
same
branch
circuit
if
the
system
has
more
than
one
power cord.
5.
Plug in the power cord.
If
a power
control
is used, plug
the
power
cord
into the receptacle
marked
UNSWITCHED
AC.
WARNING
Do not touch the computer after plugging
it
in
until
grounding has been checked.
6.
Before touching
the
computer,
check
the
frame
to
ground
voltage
to
ensure
that
less
than
10 Vac
is
present.
7.
Without
touching any metal
part
of
the
PDP-S/A,
turn
ON
the
power
ON/OFF
switch.
4-1
8.
Repeat step
6.
In case of difficulty, have an electrician check the socket into which the computer has
been connected. (Refer to Appendix E for power connection information.) If no difficulty
is
encoun-
tered, the computer frame
is
properly grounded, and there
is
no danger in touching it.
9.
Power
is
now applied
to
the PDP-8/A. The fans should be running, and the BATTERY
CHARG-
ING
light should light momentarily
or
stay on. (The light
is
not
used in the H9300 chassis assembly.)
If
none
of
the above occur, check the
MASTER/SLAVE
switch (refer to Paragraph 3.4.8). Turn the
power
OFF
before checking the
MASTER/SLAVE
switch. This switch should be in the MASTER
(to the right) position. Then turn the power ON. If the condition still exists, refer to the basic mainte-
nance section
in
Chapter
9.
10.
Turn the
PDP-8/
A power
switc.h
OFF
and the Teletype
LINE/OFF/LOCAL
switch to the
OFF
position.
11.
Connect the Teletype signal cable to the short cable
(DEC
Part
Number
BCOSM-IF, plugged into J3
of
the M8316) in the PDP-8/A.
The
cable connectors are keyed for proper mating.
12.
Plug the Teletype into the same ac outlet as the
PDP-8/
A.
13.
Turn the power
ON/OFF
switch on the
PDP-8/
A to
ON.
14.
Turn the Teletype
LINE/OFF/LOCAL
switch to LINE. Only the hum
of
the Teletype's running
motor and the
PDP-8/
A fans should be heard.
4-2
CHAPTER 5
TESTING
PDP-8/A
WITHOUT PAPER TAPE DIAGNOSTICS
The procedures in this chapter are used to test
the
PDP-8f A computer from the Programmer's Console.
No
paper tape diagnostic programs are required for these tests.
5.1
PROGRAMMER'S
CONSOLE
The
Programmer's Console
is
shown in Figure
3-21
and
is
fully described in the
PDP-8/A
Miniprocessor
Handbook
and the
PDP-8/
A User's Manual. Its use in testing the
PDP-8f A is
described in detail as needed
in
the paragraphs below.
5.2
CENTRAL
PROCESSOR
TEST
ROUTINES
When no
MAINDEC
diagnostics are available, small routines may be keyed into memory and run to check
PDP-8f
A operation. These tests will not completely check
out a PDP-8f A but
will locate the most common
failures. All routines start at address
0200.
If
any failures occur, carefully examine each instruction
of
the rou-
tine.
If
the instructions are correct, switch power
OFF
and check all
of
the module switch settings. (All mem-
ory contents are lost when power
is
switched
OFF
and
the routines must be reloaded.)
If
the routine
is
not
entered properly, reenter the routine and try
to
run it again.
These routines are also useful when
MAINDEC
programs
cannot
be loaded because
of
a hardware problem.
5.3 ENTERING
TEST
ROUTINES
FROM
PROGRAMMER'S
CONSOLE
The following procedure should be used
to
run Routine
1,
the first
PDP-8f
A test.
l.
Press
MD,
then DISP. This wi11let you see what you deposit.
2.
Press,
in
order, 0 0 0 0 LXA. Select memory field
O.
3.
Press,
in
order, a 2 0 0 LA. Start loading instructions
at
address 200.
4. Press,
in
order,
700
1 D
NEXT.
Deposit an instruction.
5.
Press, in order, 2 3
00 D NEXT.
Deposit an instruction.
6.
Press,
in
order, 5 2
OlD
NEXT.
Deposit an instructi9n.
7.
Press, in order, 5 2
00 D NEXT.
Deposit an instruction.
8.
Press, in order, 0 2
00
LA.
Now
get ready to start
at
location 200.
9.
To
see the accumulator (AC), press AC, then DISP.
10.
Press
INIT,
and
RUN.
Start
the program.
5-1
All
other
routines should be entered into
memory
using this procedure.
NOTE
If
you make a mistake while you are entering a number,
and you have not pressed D
NEXT,
LA etc., you can
correct the entry by reentering the entire number.