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Hewlett-Packard
98041A Disc Interface
Installation and Service Manual




HEWLETT II PACKARD
-
HEWLET~". 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, tllis warranty applies for ninety (90) days
from 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.

NO OTHER WARRANTY IS EXPFlESSED OR IMPLIED, INCLUDING, BUT
NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE. HEWLETI-PACKARD
SHALL NOT BE LIABLE FOR CO \JSEQUENTIAL DAMAGES.

* For other countries, contact your local Sales and Service Office to
determine warranty terms.
98041A Disc Interface
Installation and Service Manual




Hewlett-Packard Desktop Computer Division
3404 East Harmony Road, Fort Collins, Colorado 80525
(For World-wide Sales and Service Offices see back of manual.)
Copyright by Hewlett-Packard Company 1978
iii




Chapter 1: General Inforolation
Introduction ..................................................................... 1
Equipment Supplied .............................................................. 1
Specifications .................................................................... 2
Technical Specifications ....................................................... 2

Chapter 2: Installation
Power Requirements ............................................................. 3
Grounding Requirements ... . .................................................... 3
Fuses ............................................................................ 4
Power Cords ...................................................................... 4
Installing the Disc Interface ........................................................ 5
Interface Select Code ......................................................... 6
HP-IB Capabilities ............................................................ 7
Connecting Mass Storage Controllers ........................................... 7
Interconnecting Cables ........................................................ 7
Cable Length Restrictions ..................................................... 8
ROM Requirements ........................................................... 9
Mass Storage Unit Installation .................................................. 9
Rack Mounting ............... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 3: Theory of Operation and Service
Disc Interface General Description ................................................ 11
System Operation Overview .................................................. 12
Interface Logic Levels ........................................................ 12
Interface Card Operation ........................................................ 12
The Al I/O Control Board ................................................... 12
The A2 Data Logic Board .................................................... 13
Central Data Unit Operation ..................................................... 13
The A3 Support Board ....................................................... 14
The A4 HP-IB Board ......................................................... 14
The I/O Regis tE~rs ....................................................... 14
The PHI Chip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
The FIFO Buffer ........................................... . . . . . . . . . . . . .. 1 7
The PHI Access Control .................................................. 17
The Byte Packing Control ................................................ 18
The FIFO Fullness Counter and DMA Request Logic ........................ 18
iv




The Interrupt Request Logic .............................................. 18
The HP-IB Transceivers .......... . 18
The AS HP-IB Connector Board .. . 18
The A6 Power Supply Board ................................................. 19
Interface Block Diagram ...................................................... 21
Sequential Operation Description ................................................. 23
Non-DMA Output Operation .................................................. 23
Non-DMA Input Operation ................................................... 23
Computer DMA Output Operation ............................................ 24
Computer DMA Input Operation .............................................. 26
Additional Theory of Operation .................................................. 29
The PHI Access and Byte Packing Control State Machines ....................... 29
Byte Packing Control State Diagram ........................................... 31
PHI Access Control State Diagram. . .......................................... 33
Servicing the Disc Interface ................................................... 35
Disc Interface Disassembly Procedur es ........................................ 35
Al and A2 Assembly Access .................................................. 36
A3 thru A 7 Assembly Access ................................................. 37
Removing the A4 HP-IB Board ............................................ 38
Removing the A6 Power Supply Board ..................................... 38
Removing the A3 Support Boare .......................................... 40
Removir:tg the AS HP-IB Connector Board ................................. 40
Removing the A 7 I/O Cable As~embly .................................... 42
Replacing the PHI Chip (A4U 1) ....... . ......................................... 44
Adjusting the PHI Internal Timing. . . . .. . ......................................... 45
Procedure ....................... . ......................................... 45
Glossary of Line and Signal Name Abbreviations ............................... 48
Al I/O Control Board
Al Replaceable Parts. . . . . . . . . . . .. . ......................................... 51
A 1 Component Locator. . . . . . . . . .. . ......................................... 51
A 1 Schematic Diagram. . . . . . . . . . .. .......................................... 51
A2 Data Logic Board
A2 Replaceable Parts . . . . . . . . . . . .. . ......................................... 53
A2 Component Locator .......... . .......................................... 53
A2 Schematic Diagram ........... . .......................................... 53
A3 Support Board
A3 Replaceable Parts ............ . . ..................................... 55
A3 Component Locator .......... . . ...................................... 55
A3 Schematic Diagram ........... . . ...................................... 55
v




A4 HP-IB Board
A4 Replaceable Parts ....................................................... 57
A4 Component Locator ....................................................... 58
A4 Schematics Diagram Part 1 ................................................. 59
A4 Replaceable Parts ........................................................ 61
A4 Component Locator ...................................................... 62
A4 Schematic Diagram Part 2 ................................................. 63
A4 Replaceable Parts ........................................................ 65
A4 Component Locator ...................................................... 66
A4 Schematic Diagram Part 3 ................................................. 67
AS HP-IB Connector Board
AS Replaceable Parts ........................................................ 69
A6 Power Supply Board
A6 Replaceable Parts ......................................................... 71
A6 Component Locator ....................................................... 71
A6 Schematic Diagram ........................................................ 71
A7 I/O Cable Assembly
A7 Replaceable Parts ........................................................ 73
A 7 Connector Wiring Diagrams ............................................... 73
Chassis and Case Components ............................................... 75
Appendix ....................................................................... 77
13037 Disc Controller Service Notes .......................................... 78
Sales and Service Offices ..................................................... 82

Figures

Line Voltage Switches ............................................................ 3
Power Cords ...................................................................... 5
HP 98041A Disc InterfacE~ .......................................................... 6
Interface Select Code Swilch ........................................................ 6
Standard HP-IB Cables ........................................................... 7
Example System ConfigUirations ................................................... 8
Basic Control Machine Structure .................................................. 29
Structure of the Controller Circuitry ............................................... 30
Interface Card Disassembly ...................................................... 36
A3 thru A7 Assembly Access ..................................................... 37
Removing the A4 HP-IB Board