Tektronix 067 -0794-00 User manual

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-2343-00
TEKTRONI»
067 -0794-00
ROMULAN LOADER
INSTRUCTION MANUAL
First Printing MAY 1977

Copyright© 1977 by Tektronix, Inc. Beaverton, Oregon. Printed
in the United States of America. All rights reserved. Contents
of
this publication may not be reproduced in any form without
permission of Tektronix, Inc.
This instrument, in whole or in part, may be protected by one or
more U.S. or foreign patents or patent applications. Information
provided on request by Tektronix, Inc., P.O. Box 500, Beaverton,
Oregon 97077.
TEKTRONIX is a registered trademark of Tektronix, Inc.

This manual supports the following versions of this product: 067-0794-00 with 670-4173-00/01
MANUAL REVISION STATUS
REV.
DATE
DESCRIPTION
@ 5/77
Original Issue
-
067-0794-00 ROMULAN
@

Section 1
CONTENTS
OPERATION Page
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Loading a Program With Romulan . . . . . . . . . . . . . . . . . . . 1-3
Programmed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Romulan IPL Bootstrap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
MKPHT· . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Starting MKPHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Processor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Memory Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Error Codes ( 1-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Locating a Faulty Chip (Error Code 4) . . . . . . . . . . . . . . 1-11
HexpanelTest ................................... 1-12
Keyboard Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
WARNING I
The remaining portion of this Table of Contents lists servicing instructions thatexpose
personnel to hazardous voltages. These instructions
are for qualifiedservice personnel
only.
Section 2
Section 3
Section 4
Section 5
INSTALLATION
Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
THEORY OF OPERATION
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Romulan Circuit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
REPLACEABLE PARTS
SCHEMATIC
CHANGE INFORMATION
Table
1-1
Figure
1-1
1-2
1-3
1-4
1-5
1-6
067-0794-00 ROMULAN
TABLES
Description Page
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
ILLUSTRATIONS
Description
The Romulan Card
Romulan Address Switches .......................... .
ASCII Code Chart With Hexadecimal Equivalents ......... .
Hexpanel Display Indicators for Faulty Chip Location ..... .
Memory Card Bit Locations ......................... .
Hexpanel Display of Function Keys During Keyboard Test
Romulan Component Locations
@
Page
Frontis
1-2
1-7
1-9
1-10
1-13
ii

Fig. 1-1. The Romulan Card.
iii @ 067-0794-00 ROMULAN

Section 1
OPERATION
GENERAL INFORMATION
The 067-0794-00 Romulan Loader card (Fig. 1-1) is a special purpose circuit card that plugs
into the card cabinet of the 4081 Graphic System; it loads programs or data into the 4081
System's Memory. Romulan is equipped with four sockets for mounting Programmable Read-
Only Memory (PROM) devices which permanently store the program to be loaded.
Two PROMs are furnished with the Romulan card. The IPL (Initial Program Load) PROM
contains.a bootstrap program which, when started, locates the 4081's main program
(operating system) wherever it resides in disc memory, and loads it into the 4081 's Memory.
The other PROM contains MKPHT -Memory, Keyboard, Processor, and Hexpanel Test-a
diagnostic program which tests the basic 4081 System, except for the Display Controller,
Communications Interface, and the Cartridge Tape Unit. MKPHT sequentially exercises the
Memory, the Keyboard, the Processor, and the 067-0772-00 Hexadecimal Display Panel
(Hexpanel). Itis asophisticated program which should generally be operated only bysomeone
familiarwith theSystem and its theory ofoperation. The Hexpanel is used to diagnose memory
problems.
The Romulan card mayalso be used with custom-programmed PROMs. The card, as shown in
Fig. 1-1, has four sockets for PROMs, labelled U351, U151, U131, and U331.
Referringagain to Fig. 1-1, noticethatthereare 13 slideswitches at the leftside of the Romulan
card as it is viewed in the illustration. The bottom one is the Load/Start switch, which is
normally left in the up (Load) position. When Load/Start is in the Start position, Romulan is
effectively removed from the system.
067-0794-00 ROMULAN @
1-1

OPERATION
1-2
The other 12 slide switches are Address Switches. They are set to manually address a PROM
plugged
into one of the four sockets on the Romulan card. As indicated in Fig. 1-2, a switch in
the left position enters a "O" character in the address, and in the right position it enters a "1 ".
Starting addresses (digits enclosed in quotesand preceded by "X" are hexadecimal notation)
of the PROM sockets are as follows:
U351 is X'OOO' (Switches set to 0000 0000 0000)
U151 is X'400' (Switches set
to 0100 0000 0000)
U131 is X'800' (Switches set
to 1000 0000 0000)
U331 is
X'COO' (Switches set to 1100 0000 0000)
~-- Front of 4081 Cardcage
0~1
.LOAD
DSTART
Address Switches
Address Switches Set to X'400'
LOAD/ST ART Switch Set to LOAD
Fig. 1-2. Romulan Address Switches.
@
2343-2
067-0794-00 ROMULAN

OPERATION
Loading A Program with Romulan
There are several methods for loading a program that is stored in Romulan into the System's
Main Memory. After the program is loaded, the
4081 begins executing the program. Steps A
and B
of the first method (INIT) are common to all methods.
1. INIT Button.
A. With the Romulan card plugged into the 4081, set the Address switches on Romulan to the
starting address
of the IPL PROM. For example, if IPL is plugged into the U151 socket, the
switches should be exactly as shown in Fig. 1-2, to address X'400'.
B. Check that the Load/Start switch on Romulan is set to Load.
C. Press the INIT button on the Hexpanel's keyboard. The IPL Software will load from disc
into Memory.
2. Warm Start.
A. Check that the WARM START strap on the Keyboard Controller is set to IN.
B. Simultaneously press the SHIFT and RESET keys on the 4081 keyboard.
3. Without Hexpanel.
A. Mount any tape in the Cartridge Tape Unit.
B. Push the IPL button on the Cartridge Tape Unit.
C. The tape will rewind to the load point, run forward a short distance, and stop briefly.
Remove the tape from the unit, and the System will load from disc.
4. Power Up Load.
If the Power-Up switch on the Tape Interface card is on (down position), the loading
sequence will automaticallystartwhen the 4081 's Powerswtich is turned on. There must be
a tape in the CartridgeTape Unit for the loading process to complete itself. Wait for thetape
to rewind, move forward, and stop briefly. Then remove the tape from the drive, and the
operating system will load from disc.
NOTE
Power-Up Bootstrap loading will not work from a hard disc if the hard disc is not
ready (up to speed) at the moment the 4081 's power is turned on.
067-0794-00 ROMULAN
@ 1-3

OPERATION
1-4
PROGRAMMED OPERATION
A program running on the 4081 may access data or a subroutine stored in a PROM on the
Romulan card. The program first must send the starting 12-bit PROM address to Romulan. A
Write Halfword instruction sent to device X'05' (Romulan) sets the starting address (12 least-
significant bits of the data halfword). Subsequent Read Data instructions (or a Read Block
instruction) retrieves the data from sequential locations in the 1024-byte PROM. Starting
addresses related
to PROM locations in the Romulan sockets are discussed under "General
Information "earlier in thissection. TheAddressswitchesare not used for program operation,
but the Load/Start switch must be in the Load (up) position. A Sense Status instruction will
normally result in astatus byte with all bits reset. Ifthedevice is not installed, or the Load/Start
switch is in Start position, the Examine bit of the status byte will be set. Other common
input/output instructions (e.g., Output Command) have no effect on Romulan. Interrupt-
driven operations are not possible with Romulan. Refer to the Plot 80: Assembly Language
Programming Manual for general 4081 programming information.
ROMULAN IPL BOOTSTRAP
The IPL Bootstrap program is approximately 800 bytes in length, and is contained on one
PROM.
To run the program, Romulan must be installed in the 4081 card cabinet. Start the IPL
Bootstrap program by following the procedure described under "Loading A Program With
Romulan". As soon as this is done, the Bootstrap program begins its search for a file titled
???IPL.SYS (the question marks represent
any characters describing the operating system in
use-for example, GOS or IGT). The Bootstrapfirstsearches hard disc locations DKO through
DK?, then runs through floppy disc locations FOO through FD3. Each device's primary
directory is searched for a file bearing the proper name. When ???IPL.SYS is located, the
Bootstrap loads it into Memory, ???IPL.SYS then becomes the 4081's operating system.
Ifa device is unavailable, or thefile cannot befound, the nextdevice in sequence is searched. If
the file can't be found on any of the devices, or if there is an error on all devices, the keyboard
lights are lighted and the program loops. Ifthe proper media is mounted and INIT is pressed
again at this point, a valid program load
should result. If a hard disc is used, wait for its Ready
light to go on before attempting to use the IPL Bootstrap.
@ 067-0794-00 ROMULAN

OPERATION
MKPHT
This diagnostic program checks out the basic 4081 System, except for the Display Controller,
Communications Interface, and the CartridgeTape Unit. It providestesting capabilities for the
Processor, Memory, Keyboard, and Hexadecimal Display Panel. It is used when the
4081 fails
to perform properly, and also can serve to isolate trouble to the Cartridge Tape Unit or the
Display Controller by demonstrating that otherdevices in the System are operating correctly.
MKPHT is a complex program which requires considerable knowledge of the
System in order to interpret results. It should not be used except by Tektronix
Service Specialists, or others with equivalent experience.
Starting MKPHT
Use of MKPHT in a 4081 System requires installation of the Romulan card with a MKPHT
PROM, and alsorequires a Hexadecimal Display Panel. The following series of stepsstartsthe
program:
1. Set the 12 Address switches on the Romulan card to the beginning address that
corresponds
to the location of MKPHT PROM.
2. Set the Load/Start switch to Load (Up) position.
3. Initiate the program by one of the methods described under "Loading A Program With
Romulan" in this section (1 ).
067-0794-00 ROMULAN @ 1-5

OPERATION
1-6
Processor Test
As soon as MKPHT is initiated by any of the means described in Step 3 above, the Processor
Test begins. This test is not a complete check of the Processor's instruction set. It does,
however,testthecapabilityofthe Processor
to control peripheral devices in both interrupt and
non-interrupt modes. The sequence of events in the Processor Test is as follows:
1. Turns on the Four Keyboard Prompt Lights.
2. Sounds the audible indicator.
3. Turns off the Keyboard Prompt lights.
4. Sounds the audible indicator.
5. Sets the Processor's Program Status Word to X'6800'.
6. At this point, the Memory Test is entered automatically. During the Memory Test,
pressing any key on the
4081 's Keyboard will cause its ASCII code to be displayed in
Hexpanel Register R2 (LEDsD3 and D4). Forexample, pressing theG key will cause "7"
to appear in D3, and "4" to appear in D4. Figure 1-3 is a chart showing ASCII codes and
their hexadecimal equivalents.
NOTE
During the running of MKPHT, some 4081 keys have special functions. Pressing
capital K causes the program to enter the Keyboard Test. Striking the Spacebar or
capital Pcauses the program to restart at the Processor Test (which is also the only
way to restart the Memory Test, since Processor Test takes only amoment), and the
program then automatically moves directly into the Memory Test. When either the
Processor Test or the Memory Test is executing (but not during Keyboard Test),
Hexpanel Test can be entered by depressing the FN key, followed by O on the
Hexpanel's keyboard.
@ 067-0794-00 ROMULAN

OPERATION
ASCII CODE CHART
B7 B6
B5
00
0
00
1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1
BITS
HIGH X & Y
B4 B3 B2 Bl
CONTROL
GRAPHIC INPUT
LOWX LOWY
0 0 0 0
NUL DLE
SP 0 @ p \ p
0
(0)
10
(16)
20 (32)
30
(48)
40
(64)
50
(80)
60
(96)
70
(112)
0 0 0 1
SOH
DCl
I 1 A Q a q
1 (
1)
11
(17)
21
(33)
31
(49)
41
(65)
51 (81) 61
(97)
71
(113)
0 0 1 0
STX
DC2
,,
2 B R b r
2
(2)
12
(18)
22
(34)
32
(50)
42
(66)
52
(82)
62
(98)
72
(114)
0 0 1 1
ETX DC3
# 3 c s c s
3
(3)
13
(19)
23
(35)
33
(51)
43
(67)
53
(83) 63
(99)
73
(115)
0 1 0 0
EOT
DC4
$ 4 D T d t
4 (4)
14
(20)
24
(36)
34
(52)
44
(68)
54
(84)
64 (100)
74
(116)
0 1 0 1
ENQ
NAK
% 5 E u e u
5 (5)
15
(2H
25
(37)
35
(53)
45
(69)
55
(85)
65 (101)
75
(117)
0 1 1 0
ACK
SYN
& 6 F v f v
6 (6)
16
(22)
26
(38)
36
(54)
46
(70)
56
(86) 66
(102)
76
(118)
0 1 1 1
BEL ETB
I 7 G w g w
7
(7)
17
(23)
27
(39)
37 (55) 47
(71)
57
(87)
67
(103)
77
(119)
1 0 0 0
BS CAN
( 8 H x h x
8
(8)
18
(24) 28 (40)
38
(56)
48
(72)
58
(88)
68
(104)
78
(120)
1 0 0 1
HT
EM
) 9 I y I y
9 (9)
19
(25)
29
(41)
39
(57)
49
(73)
59
(89)
69
(105)
79
(121)
1 0 1 0
LF
SUB
* • J z J z
•
A
(10)
1A
(26)
2A
(42)
3A
(58)
4A
(74)
5A
(90)
6A (106) 7A (122)
1 0 1 1
VT
ESC
+ • K [ k {
'
8
(11)
18 (27)
28
(43)
38
(59)
48
(75)
58
(91)
68
(107) 78
(123)
1 1 0 0
FF
FS
< L \ I I
' I
c
(12)
1C
(28)
2C
(44)
3C
(60)
4C
(76)
5C
(92)
6C
(108)
7C
(124)
1 1 0 1
CR
GS
--M ] m }
-
0 (13}
1D
(29)
20
(45)
30
(61)
40
(77)
50
(93)
60
(109)
70
(125)
1 1 1 0
so RS
• > N
/\ n
"""'
E (14)
1E
(30)
2E
(46)
3E
(62)
4E
(78)
5E (94)
6E
(110)
7E
(126)
SI us
I ? 0 0
RUBOUT
1 1 1 1 . -
(DEL)
F
(15)
1F
(31)
2F
(47)
3F
(63)
4F
(79)
5F
(95)
6F
(111)
7F
(127)
2343-3
Fig. 1-3. ASCII Code Chart With Hexadecimal Equivalents (lower left corner of each block).
067-0794-00 ROMULAN @ 1-7

OPERATION
1-8
Memory Test
If none of thespecial-purposekeysare pressed during or immediately afterthe ProcessorTest,
MKPHT automatically enters the Memory Test. This test checks for three different failure
modes:
1. Address decoding or crosstalk.
2. Pattern sensitivity (defective memory chip).
3. Clear parity bit test. If the System under test does not have parity chips, this test has no
effect.
Verification that the Memory Testis running is provided by thefact thatthe display in Hexpanel
LED D1 continually decrements from X'F' toward Oat a rate of about one digit every 10
seconds, as thetest cycles through memory. If noerrorsoccur, the Memory Test automatically
repeats until another test is started.
When a failure in
Memory is detected, the program stops; the WAIT light on the Hexpanel
illuminates, and
an error code appears in Hexpanel LED DisplayD9 (Fig. 1-4).Table 1-1 shows
error codes with addressand data information as they appearin Hexpanel displays. Following
Table 1-1 are explanations of the various error codes, describing the probable indications.
Following these comments, the information titled "Locating a Faulty Chip" gives details on
localizing troubles indicated by an error code 4.
NOTE
When the Memory Test is run, it automatically erases the operating system from
Memory. After completion of the Memory Test, the 4081 's operating system must be
reloaded.
D9
Error Code
1
2
3
4
5
Table 1-1
ERROR CODES
Hexpanel LED Displays (Fig. 1-4)
D8,D7,D6,D5
Address Display
Failing Address
Failing Address
Failing Address
Failing Address
Failing Address
D4,D3,D2,D1
Data Display
Data
Data
Data
WXY Z1
WXY Z1
1WXYZrepresentstheactualdata
portion of theHexpaneldisplay,appearing in LEDs D4 through D1. The
actual displayIneach of these LEDsisa hexadecimal character resulting fromthecontents of one of the
four data blocks shown as W, X, Y, and Z on the Memory card In Fig. 1-5.
@ 067-0794-00 ROMULAN

OPERATION
ADDRESS DATA
DB D7 D6 D5 D4 D3 D2 D1
'------------ Most Significant
WAIT
•
•
•
•
•
•
SWITCH REGISTER
Digit Identifies
Column Addressed
MEMORY MEMORY
L........JI ADDRESS I DATA
~ PROGRAM STATUS WOAD
REG GENERAL REGISTER
L........J ...__ _______ -"'
REG FLOATING POINT REGISTER
L.......J ...__ _______ --'
r-COUNTER--,PANEL WRITE
RANSITION PULSE ENABLE LOCK ENABLE
0 0 l!I l!J l!I
IREGI
rl
ADA
L_J
~
II
tDTAl
WAT
L_J
'FLT'
EJ
(sGLl
II
8
!RUN
L...J
0
IPs4wJ
~
0
Fig. 1-4. Hexpanel Display Indications For Faulty Chip Location.
GJ
0 0
k6cl
0 0
0 0 0
0 0 0
2343-4
Error Code 1. This error occurs infrequently, but usuallydecodes similarly to an an·errorcode
4. In the Memory Test, a correct reading in the Data Display section usually shows the same
four hexadecimal characters in each Data Display LED (e.g., 0000). An error code 1display will
have one dissimilar character (e.g., 0040). Compare these two readings in the manner
described
under "Locating a Faulty Chip", but do not use Register 9.
Error Code 2. Press Hexpanel keys REG 9. If the data in Register 9 is the same as the failing
data shown in error code 2, the parity chip at the failing address location is faulty. If the failing
data and thedatashown in Register9are different, use thesame comparison test described in
Error Code 4 and under "Locating a Faulty Chip".
067-0794-00 ROMULAN @ 1-9

OPERATION
6 or 7
1-10
4 or 5 2
or 3
Most Significant Digit
of Error Address Display
Is Column Address
0or1
----Low Memory
Fig. 1-5. Memory Card Bit Locations.
@
2343-5
067-0794-00 ROMULAN

OPERATION
Error Code 3. This error code indicates an illegal instruction. Examine Memory location X'32'
to obtain the instruction address. This error can occur when the area of Memory occupied by
MKPHT is faulty. By comparing the data from the faulty address to the correct data (obtained
by examining the same address with MKPHT loaded into a known good Memory), the faulty
location is found using the Error Code 4 procedure.
Error Codes 4 and 5. The data shown in the LED display should be compared against the data
displayed when REG 9 is pressed on the Hexpanel keyboard. If only asingle binary bit differs in
the two displays, a faulty RAM chip is indicated. Then the procedure described under
"Locating the Faulty RAM Chip" should be carried out to find the fault. When more than one
binary bit differs between the error code 4 or 5 display and the REG 9 display, the indication is a
pair of shorted address lines. Error code 5 usually indicates a set of shorted address lines. Re-
running the test in this case generally produces different failing addresses and different data
displays. At this point, the shorted linescan be located quickly and accurately by the use of an
oscilloscope to examinethe waveforms on thesuspected lines while a program is running and
using memory. The crosstalk from shorted-together address lines appearsas lower amplitude
noise on the lines. Normal address linewaveforms appear as aclean pulsetrain without "fuzz".
Locating a Faulty Chip {Error Code 4). When repetitions of the Memory test continue to show
an error code 4 and the comparison of the Register 9 data to error code data shows that only
one binary bit differs, the indication is a faulty RAM chip. Locate the exact chip causing the
problem, using the following procedure.
Observe the address section of the Hexpanel display (LEDs D8, D7, D6, D5 produced by the
error); the most significant bit (D8 display) shows the column address of the chip of the
Memory card (see Fig. 1-5). Ifthere are two memory cards in the System, the column address
also identifies the card that contains the faulty device. Hexadecimal digits of larger value (8
through X'F') are high memory, and smaller-value digits (0 through 7) are low memory. The
address straps on the memory cards identify which card is low and which is high.
The display contained in LEDs D4, D3, D2, and D1 is the data that includes the error. Write
down the four hexadecimal charactersshown in these four LEDs. Then press REG and 9 on the
Hexpanel keyboard, and the data portion of the display will show the correct data that should
have been written into the memory chips.
067-0794-00 ROMULAN @
1-11

OPERATION
1-12
Comparing the four hexadecimal characters displayed by pressing REG 9 with the four just
written down will reveal a difference in digit W, X, Y, or Z. The digit in which the discrepancy
occurs is the Memory card block in which the fault has occurred (Fig. 1-5). Now the fault has
been traced
to a particular column on the card, and to the block of 4 bits in which it occurred.
The actual bitand associated memory chip are isolated by comparing the binarymakeup of the
correct Hexpanel characterwith that of theerroneousone, as shown in the following example:
Hexpanel Display
D4
D3.
D2
D1
w x y z Memory Chip Block
F F F F
Correct Display (REG 9)
F F E F Erroneous Display
t
faulty block is Y
Comparing the binary structures of the two differing hexadecimal characters:
8 4 2 1 Row
1 1 1 1 Hexadecimal F
1 1 1 0 Hexadecimal E
Lfaulty bit in row 1
Referring again to Fig. 1-5, we see thatthe error has occurred in the 4-row block "Y", row "1" of
the column that is indicated in D8 of the Address Data display. If the column digit is, for
example, E or F, U212 is the faulty device.
Hexpanel Test
To enter the Hexpanel Test from either the ProcessorTest or the Memory Test, press the FN
and Okeys on the Hexpanel keyboard. The Hexpanel Test will then generate an interrupt and
be serviced. TheProcessorentersaWait state, turning on theWAIT Light on theHexpanel and
the four prompt lightson the 4081 Keyboard. To display the Processor's Program StatusWord
of X'8000' on Hexpanel LEDs D1 through D4, press, in order, Hexpanel keys FN, 4, FN, 4. To
continue with MKPHT, starting over with the Processor Test, press the Hexpanel RUN key or
press FN Oagain.
@ 067-0794-00 ROMULAN

OPERATION
Keyboard Test
The Keyboard Test is entered by pressing K on the 4081 keyboard. The Keyboard Test
exercises the Real-time
Clock first. If an interrupt is received from the Real-time Clock, "Fb"
appears on Hexpanel LEDs D1 and D2 (X'FB' is the address of the Real-time Clock on the
Keyboard Controller). At this time, pressing any function key on the 4081 keyboard, or moving
the Joyswitch in any direction will cause a digit that corresponds to the pressed key's relative
bit position in a 16-bit halfword to be displayed on Hexpanel LEDs D1 through D4 in the
arrangement shown in Fig. 1-6. To exit the Keyboard Test and return to the beginning of the
Processor Test, press capital P or hit the Spacebar on the 4081.
lol
Alphanumeric Keyboard Function Keys on 4081
Displayed D!git O D O O
When Function~
8 4 2 1
ODDO
DODD
Key Is Pressed '-----v-----1
8 4 2 1
'-----v-----1
8 4 2
•
•
•
•
•
SWITCH REGISTER
MEMORY MEMORY
L........JI ADDRESS I DATA
8 PROGRAM STATUS WORD
REG GENERAL REGISTER
L........J'--~~~~~--'
REG FLOATING POINT REGISTER
L-1'--~~~~~---'
r-COUNTER---,PANEL WRITE
RANSITION PULSE ENABLE LOCK ENABLE
~
II
ADR
L__J
B
II
II
~
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(2297) 2343-6
Fig. 1-6. Hexpanel Display Of Function Keys During Keyboard Test.
067-0794-00 ROMULAN @ 1-13