HP 98625A User manual

HP Computer Systems
HP 98625A
Disc Interface Installation
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HP Computer Systems
HP 98625A
Disc Interface Installation
rli~ HEWLETT
-=~ PACKARD

Fli;' HEWLETT
':1:. PACKARD
Warranty Statement
Hewlett-Packard products are warranted against defects
in
materials and workmanship. For Hewlett-Packard Desktop
Computer Division products sold
in the U.S.A. and Canada,
this warranty applies for ninety (90) days from the date of
delivery.* Hewlett-Packard will, at its option, repair or replace
equipment which proves to be defective during the warranty
period. This warranty includes labor, parts, and surface
travel costs, if any. Equipment returned to Hewlett-Packard
for repair must be shipped freight prepaid. Repairs
necessitated by misuse of the equipment, or by hardware,
software, or interfacing not provided by Hewlett-Packard are
not covered by this warranty.
HP warrants that its software and firmware deSignated by HP
for use with a CPU will execute its programming instructions
when properly installed
on that CPU. HP does not warrant
that the operation of the
CPU, software, or firmware will be
uninterrupted or error free.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES
OF MERCHANTIBILITY AND FITNESS FOR
A PARTICULAR PURPOSE. HEWLETI-PACKARD SHALL
NOT
BE LIABLE FOR CONSEQUENTIAL DAMAGES.
*For other countries, contact your local Sales and Service
Office to determine warranty terms.

HP 98625A
Disc Interface Installation
Part No. 98625-90000
,~: Copyright Hewlett-Packard Company, 1982
This document refers to proprietary computer software which is protected by
copyright. All rights are reserved. Copying or other reproduction of this program
except for archival purposes is prohibited without the prior written consent of
Hewlett-Packard Company.
Hewlett-Packard
Roseville Networks Division
8000 Foothills Boulevard
Roseville, California 95678

ii
Printing History
New editions of this manual will incorporate all material updated since the previous edition.
Update packages may be issued between editions and contain replacement and additional
pages to
be merged into the manual by the user. Each updated page will be indicated by a
revision date at the bottom of the page. A vertical bar
in the margin indicates the changes on
each page. Note that pages which are rearranged due to changes on a previous page are not
considered revised.
The manual printing date
and part number indicate its current edition. The printing date
changes when a new edition
is printed. (Minor corrections and updates which are incorporated
at reprint
do not cause the date to change.) The manual part number changes when extensive
technical changes are incorporated.
June 1982 ... First Edition
September
1983 ... Update 1
September
1983 ... Reprint (incorporating Update 1)

Table of Contents
Chapter 1: Interface Installation and Configuration
Introdluction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1
Parts :Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2
HandHng the Interface
Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2
Installing Interface Cards in the I/O Backplane
.................................... 3
Configuring
the Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4
Conn1ecting the Interface to Disc Drivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6
Interface Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 6
Physical Arrangement of Equipment
...... ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6
Li:mitations
.............................................................. 7
Chapter 2: Service Information
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
Parts List
and Schematic Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
Figures
Tables
HP 98625A Disc Interface Configuration Switches. . . . . . . . . . . . . . . . . . . . . . . . . .. 4
Recommended Arrangement of Computer and Disc Drives. . . . . . . . . . . . . . . . . . .. 7
Disc Interface Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 9
Parts
Supplied. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2
Default Configuration Settings
............................................ 4
Interface Select
Code Switch Settings ...................................... 5
Binary/Decimal Table of Hardware Interrupt Levels
.......................... 5
Available HP-IB Interface Cables
......................................... 6
Disc Interface Cable Length Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 7
Replaceable Parts List
................................................. 10
iii

iv

Chapter 1
Interface Installation and Configuration
Introduction
The HP 98625A Disc Interface is used in conjunction with an HP 98620 DMA card to connect
your
HP 9826 or HP 9836 computer to one or more mass storage disc drives. The interface is
compatible with all Hewlett-Packard CS/80 disc drives including the following HP 7900 Series!
units:
• HP 7908
• HP 7911
• HP 7912
To minirnize potential difficulties, don't forget that:
• The interface contains a high-speed HP-IB controller, and is designed specifically for disc
appllications. Because of its high data rates and fast signal transition times, the interface is
not suitable for use with other HP-IB peripherals.
• High-speed data transfers demand direct memory access capability; therefore, the inter-
face
cannot be used without a DMA card installed in the computer.
• The HP 10833 HP-IB chaining cables used with this interface are designed for high-
frequency applications. To ensure reliable operation,
do not use any other cable type.
Note
The HP 98625 Disc Interface requires an HP 98620 DMA card for
operation. It
cannot be used without DMA capability installed in the
computer. Use only 256K-byte memory boards in combination with
the disc interface and DMA card.
This manual explains the installation procedure for the disc interface. Additional technical
information
is included for use by service personnel.
1 As new disc drives become available through new product development, the models supported by this interface may increase. Consult with
your
HP Sales and Service office if you need assistance in selecting disc drives for use with this interface.
1

2 Interface Installation and Configuration
Parts Supplied
The following items are supplied with the HP 98625A Disc Interface:
Item
Interface Card
Installation Manual
Select
Code Label
Part Number
98625-66501
98625-90000
7120-1957
Handling the Interface Card
The interface card contains components that are easily damaged by static electrical discharge
caused by improper handling. To minimize the risk of component damage, the interface
is
shipped in a special conductive plastic bag for protection. Do not remove the interface from the
bag until
it is to be installed. When installing the interface, be sure there is no opportunity to
create a static discharge. Hold the interface by the thumbscrews
and backplane cover while
removing
it from the bag, and avoid touching the circuitry on the card. Touch the metal surface
on the computer rear cover panel with one hand and maintain that contact while plugging the
interface into the computer with the other hand. After the interface
is seated into the backplane
connector, the risk of damage
is negligible. Whenever you need to remove the card from the
computer for service or system changes, keep the card
in its protective bag to prevent compo-
nent damage,
or place the interface on a work surface designed for servicing static-sensitive
electronic components
and assemblies.
Be careful to avoid touching the printed circuit edge connector fingers
on the interface. Finger-
prints promote contamination that can lead to unreliable operation. If
it becomes necessary to
clean the fingers, use a cotton swab
and isopropyl alcohol. Be sure to avoid the possibility of
electrostatic discharges while cleaning the connector fingers; both for safety,
and to prevent
component damage.

Interface Installation and Configuration 3
Installing Interface Cards in the 1/0 Backplane
The HP 9826/9836 computer has eight backplane slots that can be used for interface cards,
memory boards,
and other devices. However, only four slots can be used for interfacing to
external peripherals. The peripheral interface slots are located slightly below the threaded
fasteners that hold the interface retainer screws when the card
is inserted. If you insert the
interface into the wrong slot, the thumbscrews
in the interface cover cannot mate properly with
the threaded fasteners
in the rear panel. As successive interfaces are installed, the remaining
slots that are available for memory or other devices are reduced by
one for each interface
inserted.
To install the interface card, follow these steps:
1. Set the configuration switches on the interface as instructed in the Configuring the Inter-
facE~ section later in this chapter.
2. Be sure that the computer power switch is OFF.
3. Remove one or more backplane covers to locate an empty 110 slot. If none is available,
rearrange the memory boards as necessary. Memory boards can be installed in any slot in
the backplane. Be sure all boards are firmly seated in their respective backplane connec-
tors before replacing the covers.
If no slots are available, you must remove a memory board or other 110 card to free up
the necessary backplane space. If you remove a RAM memory board, it must be the
lowest address board
in the backplane. Refer to the Operating Manual for your computer
for information on how to identify the lowest-address memory card.
4. Slide the interface card into any available slot, component side
UP. Seat the card firmly
into its backplane connecter, then tighten the thumbscrews until they are finger tight. Be
sun~ a DMA card has been installed in the computer.
5. Replace any remaining covers that were previously removed, then use
an appropriate
cable to connect the interface to the first disc drive. Use HP 10833 cables to connect to
othler drives as explained later in this chapter.
6. Turn the computer and peripheral(s) on and operate as explained in the applicable
ope:rating manuals. If you encounter difficulty, contact your nearest HP Sales and Service
office.

4 Interface Installation and Configuration
Configuring the Interface
As shown in the figure, there are two sets of configuration switches on the interface card. One
determines the interface select code, and the other sets the hardware interrupt level. To set the
switches, use a ball-point pen or other pOinted object to depress the left or right side of the
switch rocker. Be sure the rocker is fully seated in its proper position. When the right side of any
rocker is fully depressed, the switch is open, and a binary ONE is programmed for that bit. If the
rocker is fully seated, left side down, the switch is closed and a binary ZERO is programmed
instead. Note the position of the most significant (MSB) and least significant (LSB) bits on each
switch. The switches are shown in their factory-set (default) positions.
-
=
-
-
-
-
-
-
.
LSB
=
INTERRUPT
o LEVEL
I~l r~ F1 11
1
0'0
~ ~ l ~ W ~--+---~
1 §s 0
25
MSB
SELECT
CODE
4 ~~-
..
-
-
=
-
-
-
HP 98625A Disc Interface Configuration Switches
Default Configuration Settings
Configuration Switch Function
Interface Select Code
Hardware Interrupt Level
Default Value
14
6
Allowable Range
8 thru 31
3 thru 6

Interface Installation and Configuration 5
Interface Select Code Switch Settings
S2 Settings
MSB 43210 LSB Decimal Value
01000 8
01001 9
01010 10
01011 11
01100 12
01101 13
01110 14
01111 15
10000 16
10001 17
10010
18
10011
19
Binary/Decimal Table of
Hardware Interrupt Levels
SI
Settings Decimal Interrupt
MSB LSB Value Level
0 0 0 3
0 1 1 4
1 0 2 5
1 1 3 6
S2 Settings
MSB43210 LSB Decimal Value
10100
20
10101
21
10110
22
10111
23
11000 24
11001 25
11010
26
11011
27
11100
28
11101 29
11110
30
11111
31
No other interface card can be set at the
same hardware interrupt level as the HP
98625. Otherwise, system failure may
result.
Default switch settings are compatible
with most applications.

6 Interface Installation and Configuration
Connecting the Interface to Disc Drives
The HP 98625 Disc Interface is intended ONLY for connecting the HP 9826/HP 9836 Compu-
ter to HP 7900 Series disc drives equipped with CS/80 (Command Set 1980) controllers. Do
not attempt to use the interface with any other disc
or controller. If you have any question
concerning compatibility of the interface
and a specific drive, contact your nearest HP Sales and
Service office. This chapter explains which interface cables can be used, and establishes guide-
lines for connecting multiple drives to a single interface.
Interface Cables
Use only HP 10833 HP-IB chaining cables to connect the disc interface to disc drives. These
cables are also used to chain multiple drives together.
HP 10833 Series cables are similar in
appearance to standard HP-IB or IEEE-488 chaining cables, but they have additional shielding
and other features to minimize RFI and improve noise characteristics. HP 10833 cables can be
identified by the model number printed on the cable jacket at each end of the cable. Do not use
any other model cable to connect the interface to disc drives or controllers.
Chaining cables are usually supplied with disc drives, so none is included with the interface.
Cables are available in several lengths.
If you need additional or different length cables, you can
order any of the following:
Available HP-IB Interface Cables
Catalog Number
10833A
108338
10833C
108330
Cable Length
1 metre
2 metres
4 metres
0.5 metre
Note that the total cable length in any application must not exceed 10 metres.
Physical Arrangement of Equipment
HP-IB connections can usually be made using either linear ("daisy-chain") or star configura-
tions. However, the linear configuration
is preferred because it allows shorter cable lengths and
maximizes noise and performance safety margins.

Interface Installation and Configuration 7
DISC DISC DISC DISC COMPUTER
DRIVE DRIVE DRIVE DRIVE
# 1
#2 #3 #4
o c:::=::J CJ c::::::::::J
c:=::::J
===
=
[ ]QD
Recommended Arrangement of Computer and Disc Drives
Limitations
Electrical design limits require that the combined bus connections must not exceed 11 equiva-
lent loads
and 10 metres total line length for each interface. In addition, line length must not
exceed
one metre per equivalent load. (These restrictions are due to transmission line reflection
characteristics
and timing constraints for high data rates.) The interface presents seven equiva-
lent loads. Most disc drive controllers in the CS/80 series present
one equivalent load. There-
fore,
up to four discs can be connected to a single interface. If only one disc is used, line length
must not
42xceed eight metres. Two discs can be connected with up to nine metres of cable;
three
or four discs with up to 10 metres. The maximum length of cable that can be connected to
a single interface
and up to four discs or equivalent loads is as follows:
Disc Interface
Cable Length Limits
Equivalent
Loads
1
2
3
4
Maximum Total
Cable Length
8 Metres
9 Metres
10 Metres
10 Metres
Consult disc operating manuals to verify the number of equivalent loads presented by each
controller.

8 Interface Installation and Configuration

Chapter 2
Service Information
Theory ofOperation
The disc interface is, conceptually, relatively simple. It consists of:
• a hi~~h-,Speed HP-IB controller contained in a single integrated circuit package,
• a D]V1A interface/control state machine that manages the interaction between the HP-IB
controller and the DMA card, and
• interface select/control circuitry that interacts with the computer through the I/O back-
plane.
The following block diagram shows the relationship of the circuit functions:
--
~
\
1/0 BACKPLANE
CONNECTOR
-
DMAINTERFACE
CONTROL -
HIGH-SPEED
HP-IB
CONTROLLER
CPU INTERFACE
CONTROL
Disc Interface Block Diagram
HP-IB CABLES
AND CONNECTORS
TO DISC DRIVES
Data transfers are set up and initiated by the computer through interaction with the interface. A
DMA channel is activated, and all data transmission and reception is handled through the DMA
channel. Upon completion of the transfer, an interrupt to the computer is generated. The
computer then suspends the DMA channel and deactivates the interface. DMA capability is
required because the high data rates exceed the capabilities of normal CPU-based 110 drivers.
Parts List and Schematic Diagram
The Disc Interface is normally serviced on a replacement basis. However, the following list of
replacement parts
is provided for your convenience.
9

10 Service Information
Reference
Designation
Cl
C2
C,3
C4
C~j
C6
C"1
CO
(:</
Cl0
Cll
C12
C13
C14
C15
C16
(:17
C18
Fl
J2
Rl
R2
R:I
F'C,
R';.
Pc
RH
R9
Sl
52
Ul
U2
IB
U4
U~j
U6
U'7
U8
1)9
1.110
Ull
U12
LJ13
U14
U15
U16
1.117
U18
1J19
U20
U;'!1
lI;;~2
1.123
U;~4
U25
U26
lI27
lI2.8
1.129
Vl
HP Part
Number
9Bb;?5-·h6~ 01
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Replaceable Parts List
Description
I)ISC
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ASSEMBl v
CAPACITOI~·-FXI) ,011.11:
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CAPAClTOR·F xn llJF .20% <'~'>VI)C
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CAPAC! TnR·· FXI)
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CAPACITOR-FXD
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CAPAcnnR-Fxn ,OII.JF ,
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C[ R
CAPACITlW-FXD
,(I lUI:
+··10% 100VDC CER
CAPM:ITOR·Fxn ,011.1F ,·_·10% 100VI)C
C[ R
CAPACITOR-FXD
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100VI)C
r:ER
CAPACITOR
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CAPACITOR-FXD ,01l1F +·-10% 100VDC
CF[I
CAPAClTOR ·F XD ,0ILJF
'·_·10% 100VllC CFR
CAPACITOR-·FXD ,0 lUI" +-10% 100VDC CfeR
CAPAcnnR-·FXI) ,011.11"
.. ··-10% 1 OOVIlC
erR
CAPAC1TOR-FXD ,0IUF +-10% 100VIle CER
CAPAClTORFXD ,0ILJF
'-·10%
100VIlC LER
CAPAC
ITOR -FXD ,0IUF +··10% 100VIlC CER
CAPACITDR-·Fxn
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SWITCH ASSEMf'LY·ROCK ER
SWITCH
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Service Information 11
Replaceable Parts List
Reference
HP Part
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Description
Mfr Mfr
Part Number
Designation Number 0
Code
0535-0004
9 2 NUT-HEX DBL-CHAH 113 X 0,5 2, 41111-THK
00000
ORDER BY DESCRIPTION
2190-0003
8 2 WASHER-LK HLCL NO, 4 ,ll5-IN-ID
28480 2190-0003
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2190-0919
7101-01:>24
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29480 7101-0624
8159-0005
0 1 RESISTOR-ZERO mll1S 22
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7121-1957
3 1
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284911 7121--1957
98625-90000
5 1
MANUAL-INSTALLATION
28480 98625--90000

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HP Part No. 98625-66501 Rev A
SCHEMATIC NOTES
1. PARTIAL REFERENCE DESIGNATIONS ARE SHOWN, PREFIX WITH ASSEMBLY OR SUBASSEMBLY
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OR BOTH FOR COMPLETE DESIGNATION.
2. COMPONENT VALUES ARE SHOWN AS FOLLOWS UNLESS OTHERWISE NOTED.
RESISTANCE
IN OHMS
CAPACITANCE
IN MICROFARADS
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