Service Manuals, User Guides, Schematic Diagrams or docs for : HP 98xx 98033-90000_bcdIntf_Sep79
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Hewlett-Packard 98033A BCD Interface
Installation and Service Manual
HEWLETT. 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 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 EXPRESSED OR IMPLIED, INCLUDING, BUT
NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE. HEWLETT-PACKARD
SHALL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES.
* For other countries, contact your local Sales and Service Office to
determine warranty terms.
98033A BCD 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 1976
ii
iii
Table of Contents
Chapter 1 : General Information
Introduction " "
Technical Specifications, " , 1
Physical Description 3
Front Housing 3
Rear Housing ,,, 4
Options and Accessories 4
Chapter 2: Installation
Introduction 5
Installation Considerations" , > , 5
Device Cable > ,,, 6
Select Codes 8
Select Code Interrupt Considerations 9
Configuration Switches , 10
Input Formats, > , " , >""', 12
Data Fields ", 12
Overload and Signs > > , , 13
Control and Flag Lines , , , , 13
Recommended Driver and Receiver Circuits " , , , 14
Chapter 3: Operation
Introduction , " 15
General Operation 15
Standard Format 15
Optional Format " 16
Interrupt Operation, " >, 16
Interface Reset , 16
Examples of Operation , , , 17
Standard Format " 17
Optional Format 17
Overload Detection, " 17
iv
Chapter 4: Theory of Operation
Introduction 19
Computer I/O Backplane 19
I/O Registers .. 20
Flag and Status Lines 21
Interface Block Diagram Description 22
Interface Mnemonics .22
Address Decoder 23
Command Decoder 24
Character Counter and Format Selector 24
Sample Controls .26
Multiplexer 27
Code Converter and Interru pt Poll Responder 28
Interrupt Logic 30
Reset Logic 31
Chapter 5: Troubleshooting and Repair
Introduction 33
Recommended Equipment 33
Interface Operational Test 35
Procedure 34
Troubleshooting 37
Procedure 37
Broken Trace Repair 38
Tables
2~ 1 Cable Connections 6
2-2 BCD code to ASC II Character 12
4-1 Computer I/O Backplane Signals 19
4-2 Interface Signals 22
4-3 ROM Contents 29
4-4 Interrupt Poll Response 31
5-1 Test Program 1 Results 35
5-2 Test Program 2 Results 36
5-3 Replaceable Parts 39
v
Figures
1-1 98033A BCD Interface 3
2-1 Cable Preparation 8
2-2 Setting the Select-Code Switch 9
2-3 Configuration Switch Locations 10
2-4 Configuration Switches , " . 10
2-5 CTLA-1 and CTLA-2 Timing. 11
2-6 Recommended Drivers 14
2-7 Recommended Receiver 14
4-1 I/O Register Operation 21
4-2 Address Decoder .23
4-3 Command Decoder . 24
4-4 Character Counter and Format Selector. 25
4-5 Timing Diagram for a Read Operation 25
4-6 Sample Control " 26
4-7 Handshake Timing Diagram 27
4-8 Code Converter and Interrupt-Poll Responder. .. 28
4-9 Interru pt Log ic . .30
4-10 Reset Logic ... 31
4-11 98033A BCD I nterface Block Diagram . .31
5-1 Test Connector Installation .,. 34
5-2 Interface Test Program 1 > 35
5-3 Interface Test Program 2 (Strings ROM Required) > 36
5-4 Extender Board Installation .37
5-5 98033A BCD Interface Schematic . .",,41
vi
Chapter 1
General Information
Introduction
The 98033A BCD Interface provides the Desktop Computer with capability to interface a
variety of instruments which have BCD information presented in bit-parallel, digit-parallel
form.
The interface contains circuits which, upon execution of a read command, triggers a device to
initiate a reading, waits for the device to signal that the data is available to read, and then
transfers the BCD data to the calculator in the form of 16 consecutive ASCII Characters. In
addition, the interface will operate in a mode which provides hardware interrupt capability.
Technical Specifications
Power Requirements:
+5 volts at 210 mA (supplied by the computer)
Operating Temperature Range:
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