Alpha Microsystems AM-318 User manual

RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
RIGHT. FROM THE START
AM-318
Eight-Port
Serial I/O Board
Installation Instructions
PDI-00318-00,Rev.A03

1995 Alpha Microsystems
REVISIONS INCORPORATED
REVISION DATE
00 May 1994
01 Sept. 1994
02 Nov. 1994
03 Nov. 1994
AM-318 Eight-Port Serial I/O Board Installation Instructions
To re-order this document, request part number PDI-00318-00.
The information contained in this manual is believed to be accurate and reliable. However, no
responsibility for the accuracy, completeness or use of this information is assumed by Alpha
Microsystems.
This document may contain references to products covered under U.S. Patent Number 4,530,048.
The following are registered trademarks of Alpha Microsystems, Santa Ana, CA 92799:
AMIGOS AMOS Alpha Micro AlphaACCOUNTING
AlphaBASIC AlphaCALC AlphaCOBOL AlphaFORTRAN 77
AlphaLAN AlphaLEDGER AlphaMAIL AlphaMATE
AlphaNET AlphaPASCAL AlphaRJE AlphaWRITE
CASELODE OmniBASIC VER-A-TEL VIDEOTRAX
The following are trademarks of Alpha Microsystems, Santa Ana, CA 92799:
AlphaBASIC PLUS AlphaVUE AM-PC AMTEC
DART ESP MULTI inSight/am
inFront/am
All other copyrights and trademarks are the property of their respective holders.
ALPHA MICROSYSTEMS
2722 S. Fairview Street
P.O. Box 25059
Santa Ana, CA 92799

Page iInstallation Instructions: AM-318 Eight-Port I/O Board
TABLE OF CONTENTS
1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3.0 CONFIGURING YOUR AM-318 BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3.1 Accessing Your Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.0 ELECTRONIC EQUIPMENT HANDLING PRECAUTIONS . . . . . . . . . . . . . . . . 4
4.1 Accessing the Main Electronics Board . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Eagle 300 AM-319(-00) I/O Expansion Slots . . . . . . . . . . . . . . . . . . . . . 7
4.3 Eagle 200 AM-319(-10) I/O Expansion Slots . . . . . . . . . . . . . . . . . . . . . 8
4.4 Eagle 100 AM-137 I/O Expansion Slot . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.0 INSTALLING THE AM-318 BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.0 EAGLE 300 REAR PANEL I/O CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . 10
7.0 EAGLE 200 REAR PANEL I/O CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . 13
8.0 EAGLE 100 REAR PANEL I/O CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . 16
9.0 INSTALLING THE AM-318’S RJ21 CONNECTOR . . . . . . . . . . . . . . . . . . . . . . 19
10.0 SYSTEM INITIALIZATION COMMAND FILE (EAGLE 200 AND 300) . . . . . . . 20
11.0 SYSTEM INITIALIZATION COMMAND FILE (EAGLE 100) . . . . . . . . . . . . . . 24
11.1 Finishing the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
APPENDIX A - EXTERNAL SERIAL I/O CABLING
A.1 SIGNAL LIST AND MODULAR ADAPTERS . . . . . . . . . . . . . . . . . . . . . A-1
A.2 THE RJ21 METAL CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
A.3 DB9 BREAKOUT BOXES AND CLUSTER CABLES. . . . . . . . . . . . . . A-6
A.4 CABLE CONFIGURATIONS TO CONNECT A TERMINAL
WITH THE DB9 BREAK OUT BOX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11
A.5 CPU TO CPU SERIAL NET CONNECTION OR CPU
TO MODEM CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
A.6 HOW TO USE THE AM-318 WITH MODULAR CABLING SYSTEMS. . A-13
A.7 GUIDELINES FOR TERMINATING CABLE SHIELDS . . . . . . . . . . . . . A-14
PDI-00318-00, Rev. A03

Page ii Installation Instructions: AM-318 Eight-Port I/O Board
A.8 WHERE TO GET MODULAR CABLING COMPONENTS. . . . . . . . . . . A-17
APPENDIX B - SUPER I/O
B.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
B.1.1 Super I/O Software Requirements . . . . . . . . . . . . . . . . . . . . . B-1
B.2 ENABLING SUPER I/O SUPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
B.2.1 Super I/O (AMOS 2.2C Only) . . . . . . . . . . . . . . . . . . . . . . . . . B-3
B.3 DISABLING SUPER I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
B.3.1 Disabling Super I/O on All AM-318 Boards . . . . . . . . . . . . . . . B-4
B.3.2 Disabling Super I/O on Individual AM-318 Boards . . . . . . . . . B-5
PDI-00318-00, Rev. A03

Page 1Installation Instructions: AM-318 Eight-Port I/O Board
1.0INTRODUCTION
This document describes the installation of AM-318 eight-port serial I/O boards into
Eagle series computers. It is written for the experienced Alpha Micro Service
Technician, so if you do not feel comfortable performing the hardware and software
procedures discussed below, please contact your Alpha Micro Dealer or the Alpha Micro
Technical Support Group for help.
2.0PRODUCT DESCRIPTION
The AM-318 board supports eight asynchronous serial I/O ports using RS232 protocol.
AM-318 boards do not support RS422. The Eagle 100 computer has a single I/O
expansion slot that will support one AM-318 board; the Eagle 200 computer has two
expansions slots and will support two AM-318 boards; the Eagle 300 computer has four
expansion slots and will support four AM-318 boards.
AM-318 boards use a modular style 50-pin RJ21 connector that mounts on the
computer’s rear panel; this connector looks exactly like your computer’s external SCSI
connector. AM-314 boards use standard female DB9 connectors. The rear panel of
your Eagle computer has cutouts for both DB9 and RJ21 connectors.
AM-318 board serial ports, as well as the Eagle 100’s eight on-board serial ports, can
take advantage of a feature called Super I/O. Super I/O handles character output in a
much more efficient manner than any other previously released AMOS serial port driver,
which greatly reduces the load on the CPU and makes more CPU cycles available for
other tasks. See Appendix B for more details.
3.0CONFIGURING YOUR AM-318 BOARD
There are no jumpers on the AM-318 board. Nothing needs to be configured; the board
is ready to install. An illustration of the AM-318 board is shown below:
ALPHA
MICROSYSTEMS
U2U3
RN1 RN2
PIN-1
AM-318
MC1067
J1
AM-318 Eight-Port Serial I/O Board
PDI-00318-00, Rev. A03

Page 2 Installation Instructions: AM-318 Eight-Port I/O Board
The AM-318 supports only RTS/CTS flow control signals; however, these signals are
adequate for terminals, printers, some modems, PC connections, and AlphaNET serial
connections. If required, the AM-314 four-port serial I/O board supports a full
complement of RS232 signals, such as CD (carrier detect) and DTR (data terminal
ready).
3.1Accessing Your Computer
When adding an AM-318 serial I/O board to your computer, it will be necessary to
remove your computer’s top cover. The top cover is held in place with four phillips-head
screws located on the computer’s rear panel. To remove the top cover, remove all four
screws from the locations indicated in the illustration below. Once the screws have been
removed, the top cover can be slid back and removed.
115
SCSI
MAIN
ALT
BOOT
MC1018
TOP COVER SCREWS
A1 A2
B1 B2
C1 C2
D1 D2
F1 F2
G1 G2
H1 H2
PARALLEL 1PARALLEL 0
ETHERNET
ENET
E1 E2
Eagle Top Cover Screws
PDI-00318-00, Rev. A03

Page 3Installation Instructions: AM-318 Eight-Port I/O Board
MC1010
Eagle Top Cover Removal
PDI-00318-00, Rev. A03

Page 4 Installation Instructions: AM-318 Eight-Port I/O Board
4.0ELECTRONIC EQUIPMENT HANDLING PRECAUTIONS
With the AC power cord unplugged and the top cover removed, the components inside
your computer are vulnerable to damage caused by static discharge. Your body and
clothing are capable of storing an electrical charge that can damage or destroy
unprotected electronic components. Prior to handling any computer hardware, make
sure your work area is properly protected against static discharge. There are a number
of commercially available static protection devices, like the wrist strap shown below,
designed specifically to protect your equipment from harmful static discharge.
MC1012
Static Protection Wrist Strap
PDI-00318-00, Rev. A03

Page 5Installation Instructions: AM-318 Eight-Port I/O Board
4.1Accessing the Main Electronics Board
If you have an Eagle 200 or 300 computer, access to your main electronics board may
be blocked if your Roadrunner board is mounted vertically, as shown in the next two
illustrations. If this true for your application, you will need to remove the Roadrunner
board and its mounting bracket in order to install your I/O board or boards. Instructions
for doing this are shown in the illustrations.
Many Eagle 200 and 300 computers have their Roadrunner boards mounted on the
bottom of the chassis in the horizontal position, which does not block access to the main
electronics board. Also, Eagle 100 computers do not use a separate Roadrunner board
and access to the main electronics board is not a problem.
DWF-20754-00
Your Roadrunner 030 or 040 board is mounted
on the DWF-20754-00 bracket shown above.
To access the board, you need to remove
these four phillips-head screws. Once the
screws are removed, the mounting bracket
and board assembly can be folded down onto
your work surface.
MC1055
Roadrunner Mounting Bracket
PDI-00318-00, Rev. A03

Page 6 Installation Instructions: AM-318 Eight-Port I/O Board
ROADRUNNER 030 OR 040
BOARD
With the Roadrunner and its mounting bracket
folded down out of the way, you will be able to
access the main electronics board.
MC1162
MAIN BOARD
Locating the Main Electronics Board
PDI-00318-00, Rev. A03

Page 7Installation Instructions: AM-318 Eight-Port I/O Board
4.2Eagle 300 AM-319(-00) I/O Expansion Slots
The AM-319 board illustration shows the four serial I/O expansion slots: J8, J9, J10, and
J11. As indicated in the illustration, the first I/O board installs in J8, the second in J9, the
third in J10, and the fourth in J11.
J10 J9 J8
J14
J2 J1
J3
BATTERY
J5 J6
J11
J7
W5
J15
J12
J13
W3
W1
W6
W9
W10
MC1062
1ST I/O BOARD INSTALLS IN SLOT J8
2ND I/O BOARD INSTALLS IN SLOT J9
3RD I/O BOARD INSTALLS IN SLOT J10
4TH I/O BOARD INSTALLS IN SLOT J11
U6
AM-319 I/O Expansion Slots
Factory integrated Eagle computers assembled by Alpha Micro always have their
AM-314 boards installed first, followed by any AM-318 boards. For example, if a
customer order called for two AM-318 and two AM-314 boards, the first AM-314 board
would be installed in J8, the second AM-314 would be installed in J9, the first AM-318
board would be installed in J10, and the second AM-318 would be installed in J11.
PDI-00318-00, Rev. A03

Page 8 Installation Instructions: AM-318 Eight-Port I/O Board
4.3Eagle 200 AM-319(-10) I/O Expansion Slots
The AM-319(-10) board illustration shows the two serial I/O expansion slots: J6 and J7.
As indicated in the illustration, the first I/O board installs in J7 and the second in J6.
J6
J1
J3 J5
J8 J9
W9
J10
W6
W5
MC1160
J7
BATTERY
J2
J4
W8
W7
w1 w2 w3 w4
1ST I/O BOARD INSTALLS IN SLOT J7
2ND I/O BOARD INSTALLSIN SLOT J6
U2
U3
AM-319(-10) I/O Expansion Slots
Factory integrated Eagle computers assembled by Alpha Micro always have their
AM-314 boards installed first, followed by any AM-318 boards. For example, if a
customer order called for one AM-318 and one AM-314 board, the AM-314 board would
be installed in J7 and the AM-318 would be installed in J6.
PDI-00318-00, Rev. A03

Page 9Installation Instructions: AM-318 Eight-Port I/O Board
4.4Eagle 100 AM-137 I/O Expansion Slot
The AM-137 board illustration shows the one serial I/O expansion slot at location J6.
BATTERY
J1
W1
J5J4
J2 J3
ALPHA MICROSYSTEMS
W4
W5
J8 J9
J6
J7
W10
J11
W11
J10
W13
W14
W7
POWER
RUN
DISK
W8
W12
W9
W6
030
FOUR ON-BOARD (4-7)
RS232 SERIAL PORTS
FOUR ON-BOARD (0-3)
RS232 SERIAL PORTS
OSCILLATOR JUMPERS
DO NOT REMOVE
1ST (AND ONLY) I/O BOARD INSTALLS IN SLOT J6
SSD
W3
W2
AM-137
MC1161
U28 U29
U14 U15
AM-137 I/O Expansion Slot
The AM-137 board has one I/O expansion slot that will support one AM-314 or one
AM318 I/O board. However, the AM-137 board has eight standard RS232 on-board
serial ports, which are accessed on the rear panel of the computer via DB9 connectors.
5.0INSTALLING THE AM-318 BOARD
The Eagles I/O expansion slots are very similiar to the type of slots memory SIMM
modules plug into. The AM-318 board should be inserted into the appropriate slot with
the component side of the AM-318 board facing your computer’s rear panel. The
AM-318 must be inserted into the expansion slot at a slight angle and after you feel the
board settle into the slot, you rotate it into an upright position. When the AM-318 is
properly positioned, the metal retainer clips at each end of the expansion slot will click
into position, locking the board in place.
PDI-00318-00, Rev. A03

Page 10 Installation Instructions: AM-318 Eight-Port I/O Board
Very little force is required to install an AM-318 board. If you’re having problems
installing the board in the expansion slot, stop and take a moment to examine both the
AM-318 and the slot. Make sure you are installing the AM-318 with the component side
of the board facing your computer’s rear panel.
6.0EAGLE 300 REAR PANEL I/O CONFIGURATION
The next step in the installation process is to install the I/O cables that link your AM-318
boards to the rear panel of your computer. In some cases, you may be installing both
AM-318 and AM-314 I/O boards, which require the installation of both DB9 and RJ21
connectors.
Instructions for installing AM-314 boards are located in the AM-314 Four-Port Serial I/O
Board Installation Instructions
, PDI-00314-00.
The next two illustrations show how rear panel serial I/O connector positions correspond
to where a particular I/O board is plugged into the AM-319 board (i.e., J8, J9, J10, and
J11). The illustrations are based on the Alpha Micro standard procedure, which
mandates that AM-314 boards be installed first (starting at slot J8) before any AM-318
boards. This standard procedure insures that serial I/O connector placement will be
consistent from computer to computer.
The first illustration shows the method used to install AM-314 DB9 connectors on the
rear panel; the other illustration shows standard mounting positions for AM-318 RJ21
connectors.
PDI-00318-00, Rev. A03

Page 11Installation Instructions: AM-318 Eight-Port I/O Board
SCSI
MAIN
ALT
BOOT
A1 A2
B1 B2
C1 C2
D1 D2
F1 F2
G1 G2
H1 H2
PARALLEL 1PARALLEL 0
ETHERNET
E1 E2
The cable that extends between the AM-314
board and the rear panel will be installed as
follows:
The connector marked P0 will be attached
to the rear panel as position H1.
The connector marked P1 will be attached
to the rear panel at position G1.
The connector marked P2 will be attached
to the rear panel at position F1.
The connector marked P3 will be attached
to the rear panel at position E1.
AM-314 (installed in slot J8 on the AM-319) The cable that extends between the AM-314
board and the rear panel will be installed as
follows:
The connector marked P0 will be attached
to the rear panel as position H2.
The connector marked P1 will be attached
to the rear panel at position G2.
The connector marked P2 will be attached
to the rear panel at position F2.
The connector marked P3 will be attached
to the rear panel at position E2.
AM-314 (installed in slot J9 on the AM-319)
The cable that extends between the AM-314
board and the rear panel will be installed as
follows:
The connector marked P0 will be attached
to the rear panel as position D1.
The connector marked P1 will be attached
to the rear panel at position D2.
The connector marked P2 will be attached
to the rear panel at position C1.
The connector marked P3 will be attached
to the rear panel at position C2.
AM-314 (installed in slot J10 on the AM-319) The cable that extends between the AM-314
board and the rear panel will be installed as
follows:
The connector marked P0 will be attached
to the rear panel as position B1.
The connector marked P1 will be attached
to the rear panel at position B2.
The connector marked P2 will be attached
to the rear panel at position A1.
The connector marked P3 will be attached
to the rear panel at position A2.
AM-314 (installed in slot J11 on the AM-319)
AM-314 (installed in slot J8 on the AM-319)
Port #0 (the boot port)
will be located at
position H1.
AM-314 (installed in slot J9 on the AM-319)
AM-314 (installed in slot J10 on the AM-319)
AM-314 (installed in slot J11 on the AM-319)
MC1063
AM-314 Rear Panel Connector Locations
PDI-00318-00, Rev. A03

Page 12 Installation Instructions: AM-318 Eight-Port I/O Board
SCSI
MAIN
ALT
BOOT
A1 A2
B1 B2
C1 C2
D1 D2
F1 F2
G1 G2
H1 H2
PARALLEL 1PARALLEL 0
ETHERNET
E1 E2
AM-318 (installed in slot J8 on the AM-319)
Port #0 (the boot port)
will be located on this
RJ21 connector.
AM-318 (installed in slot J9 on the AM-319)
AM-318 (installed in slot J10 on the AM-319)
AM-318 (installed in slot J11 on the AM-319)
This diagram indicates the rear panel
positions for 8-port RJ21 connectors based
on the slot the AM-318 board is plugged into
on the AM-319 board. This relationship
between the I/O slot on the AM-319 and the
corresponding rear panel position for the I/O
connectors will remain true even when mixing
AM-318 and AM-314 I/O boards.
MC1064
AM-318 Rear Panel Connector Locations
The information in the AM-314 and AM-318 rear panel connector illustrations remains
true even when mixing AM-314 and AM-318 boards, as long as you follow the practice
of installing your AM-314 boards first.
For example:
If you are installing two AM-314 boards, the first AM-314 installs in location J8 on the
AM-319 board; the second AM-314 installs in location J9. Based on the AM-314 rear
panel illustration, the AM-314 plugged into location J8 will use the DB9 cutouts marked
H1, G1, F1, and E1. The second AM-314, plugged into location J9, will use the DB9
cutouts marked H2, G2, F2, and E2.
If you add an AM-318 I/O board to the example, it would install in location J10 on the
AM-319 board. If you look at the rear panel illustration for AM-318 boards, J10
corresponds to location B1/B2 on the rear panel, which is where the RJ21 connector
should be installed.
PDI-00318-00, Rev. A03

Page 13Installation Instructions: AM-318 Eight-Port I/O Board
7.0EAGLE 200 REAR PANEL I/O CONFIGURATION
The next step in the installation process is to install the I/O cables that link your AM-318
boards to the rear panel of your computer. In some cases, you may be installing both
AM-318 and AM-314 I/O boards, which require the installation of both DB9 and RJ21
connectors.
Instructions for installing AM-314 boards are located in the AM-314 Four-Port Serial I/O
Board Installation Instructions
, PDI-00314-00.
The next two illustrations show how rear panel serial I/O connector positions correspond
to where a particular I/O board is plugged into the AM-319(-10) board (i.e., J6 and J7).
The illustrations are based on the Alpha Micro standard procedure, which mandates that
AM-314 boards be installed first (starting at slot J7) before any AM-318 boards. This
standard procedure insures that serial I/O connector placememt will be consistent from
computer to computer.
The first illustration shows the method used to install AM-314 DB9 connectors on the
rear panel; the other illustration shows standard mounting positions for AM-318 RJ21
connectors.
PDI-00318-00, Rev. A03

Page 14 Installation Instructions: AM-318 Eight-Port I/O Board
SCSI
MAIN
ALT
BOOT
A1 A2
B1 B2
D1 D2
E1 E2
F1 F2
PARALLEL 0 C1 C2
The cable that extends between the AM-314
board and the rear panel will be installed as
follows:
The connector marked P0 will be attached
to the rear panel as position F1.
The connector marked P1 will be attached
to the rear panel at position F2.
The connector marked P2 will be attached
to the rear panel at position E1.
The connector marked P3 will be attached
to the rear panel at position E2.
The cable that extends between the AM-314
board and the rear panel will be installed as
follows:
The connector marked P0 will be attached
to the rear panel as position D1.
The connector marked P1 will be attached
to the rear panel at position D2.
The connector marked P2 will be attached
to the rear panel at position C1.
The connector marked P3 will be attached
to the rear panel at positionC2.
AM-314 (installed in slot J6 on the AM-319-10)
Port #0 (the boot port)
will be located at
position F1.
AM-314 (installed in slot J7 on the AM-319-10)
AM-314 (installed in slot J6 on the AM-319-10)
MC1163
AM-314 (installed in slot J7 on the AM-319-10)
Some Eagle 200 computers may not
have these upper four DB9 cutouts; if
this is the case for your application,
simply use the lower four DB9 cutouts.
NOTE:
AM-314 Rear Panel Connector Locations
PDI-00318-00, Rev. A03

Page 15Installation Instructions: AM-318 Eight-Port I/O Board
Port #0 (the boot port)
will be located on this
RJ-21 connector.
AM-318 (installed in slot J7 on the AM-319-10)
AM-318 (installed in slot J6 on the AM-319-10)
This diagram indicates the rear panel
positions for 8-port RJ-21 connectors based
on the slot the AM-318 board is plugged into
on the AM-319(-10) board. This relationship
between the I/O slot on theAM-319(-10) and
the corresponding rear panel position for the
I/O connectors will remain true even when
mixing AM-318 and AM-314 I/O boards.
MC1164
SCSI
MAIN
ALT
BOOT
A1 A2
B1 B2
D1 D2
E1 E2
F1 F2
PARALLEL 0 C1 C2
AM-318 Rear Panel Connector Locations
The information in the AM-314 and AM-318 rear panel connector illustrations remains
true even when mixing AM-314 and AM-318 boards, as long as you follow the practice
of installing your AM-314 boards first.
For example:
If you are installing one AM-314 boards, the AM-314 installs in location J7 on the
AM-319(-10) board and will use DB9 cutouts marked F1, F2, E1, and E2.
If you add an AM-318 I/O board to the example, it would install in location J6 on the
AM-319(-10) board. If you look at the rear panel illustration for AM-318 boards, J6
corresponds to location A1/A2 on the rear panel, which is where the RJ21 connector
should be installed.
PDI-00318-00, Rev. A03

Page 16 Installation Instructions: AM-318 Eight-Port I/O Board
8.0EAGLE 100 REAR PANEL I/O CONFIGURATION
The Eagle 100’s AM-137 board only has one I/O expansion slot, but it also has eight
on-board RS232 serial ports, which attach to the rear panel via standard DB9
connectors.
Instructions for installing AM-314 boards are located in the AM-314 Four-Port Serial I/O
Board Installation Instructions
, PDI-00314-00.
On the next two pages there are two illustration; the first illustration shows mounting
locations for the eight on-board DB9 serial ports, plus the location of the four AM-314
DB9 serial ports; the other illustration also shows the eight on-board DB9 serial ports,
plus the location of where the AM-318 RJ21 connector would be located.
PDI-00318-00, Rev. A03