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3M Brand HCD-75 High Capacity
Data Cartridge Drive System
User Manual
February 1983
CONTENTS
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Documentation . . . . . . . . . . . . . . . . . . ........ . Data Verification and Bad Block Table . . . . . . . . . . 39
Skip Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
General Description . . . . . . . . . . . . . . . . . . . . . . . . 3 Tape Segmenting . . . . . . . . . . . . . . . . . . . . . . . . 44
DC600HC Data Cartridge ...................... 3 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
HCD-75 Drive Module ........................ 3
HCD-75 Controller Module . . . . . . . . . . . . . . . . . . . . 4 Drive Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Write Operations . . . . . . . . . . . . . . . . . . . . . . . . 5 Selecting Drive Addresses . . . . . . . . . . . . . . . . . . . . . 47
Read Operations. . . . . . . . . . . . . . . . . . . . . . . .. 6 Drive Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
System Functions . . . . . . . . . . . . . . . . . . . . . . . . .. 6
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Data Verification . . . . . . . . . . . . . . . . . . . . . . .. 6 Data Terminal Interface Specifications . . . . . . . . . . . . 49
Skip Table. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 Interface Connections . . . . . . . . . . . . . . . . . . . . . . . 49
Tape Segmenting . . . . . . . . . . . . . . . . . . . . . . . . 6 Interface Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . 50
Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . 6 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Serial Interface. . . . . . . . . . . . . . . . . . . . . . . . .. 7 Commands . . . . . . . . . . . . . . . . . . . . . . ~ ..... 50
Auto-Load Sequence . . . . . . . . . . . . . . . . . . . . . . .. 7 1. Write Diagnostic Command: W . . . . . . . . . . . . 50
2. Standard Verify: V . . . . . . . . . . . . . . . . . . . . 51
DC600HC and DC61 SHC High Capacity Data Key Verification Option: . . . . . . . . . . . . . . . . 51
Cartridge Prerecorded Format . . . . . . . . . . . . . . . . . 9 3. Special Verify (Stop on Error):* . . . . . . . . . . . 53
General Information . . . . . . . . . . . . . . . . . . . . . . .. 9 4. Certify Command: C . . . . . . . . . . . . . . . . . . . 53
Prerecorded Format . . . . . . . . . . . . . . . . . . . . . . . . 9 Key Certification Option: . . . . . . . . . . . . . . . . 53
Cartridge "Sizing" . . . . . . . . . . . . . . . . . . . . . . . . . 9 5. Read: R . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Recorded Format . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6. Memory: M . . . . . . . . . . . . . . . . . . . . . . . . 54
Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7. Display Memory: D . . . . . . . . . . . . . . . . . . . 55
8. Unload Cartridge: U . . . . . . . . . . . . . . . . . . . 55
Parallel Interface Operation . . . . . . . . . . . . . . . . . . . 15 9. Status Request: T . . . . . . . . . . . . . . . . . . . . 55
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 10. Fill Memory: F . . . . . . . . . . . . . . . . . . . . . . 55
Interface Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11. Transfer Memory: X ................... 55
Interface Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 12. End: S . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Initialize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Controller Status: . . . . . . . . . . . . . . . . . . . . . 56
Data Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Data Line Options for Various Cabling Connections ... 18 Memory Locations of Interest . . . . . . . . . . . . . . . . . . 57
16-Bit Unidirectional . . . . . . . . . . . . . . . . . . . . . . 18
16-Bit Bidirectional . . . . . . . . . . . . . . . . . . . . . . . 19 User Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8-Bit Unidirectional . . . . . . . . . . . . . . . . . . . . . . 20 Variable Block Size . . . . . . . . . . . . . . . . . . . . . . . . . 61
8-Bit Bidirectional . . . . . . . . . . . . . . . . . . . . . . . 22
Command Transfer . . . . . . . . . . . . . . . . . . . . . . , .. 24 Installation and Checkout . . . . . . . . . . . . . . . . . . . . 63
Block Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Write Data Transfers . . . . . . . . . . . . . . . . . . . . . . . . 28 Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Read Data Transfers . . . . . . . . . . . . . . . . . . . . . . . . 30 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . 64
Status Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
I. System Status Word (First Word) . . . . . . . . . . . . 32 Interconnect Cables . . . . . . . . . . . . . . . . . . . . . . 64
II. Drive Status Word (Second Word) . . . . . . . . . . . 34 Cable Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Operational Status . . . . . . . . . . . . . . . . . . . . . 34 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Failure Status (Second Word) . . . . . . . . . . . . . . 36
III. Current Track and Block Word (Third Word) ... 37
System Specifications ..... . . . . . . . . . . . . . . . . . . 69 Hen Environmental Test Results . . . . . . . . . . . . . . . . 71
Mechanical Specification . . . . . . . . . . . . . . . . . . . 69 Shock and Vibration . . . . . . . . . . . . . . . . . . . . . . 71
Temperature and Humidity . . . . . . . . . . . . . . . . . 69 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Power Requirements . . . . . . . . . . . . . . . . . . . . . . 69 Electromagnetic Interference . . . . . . . . . . . . . . . . 71
Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . 72
Maintenance Replacement Schedule . . . . . . . . . . . . 70 Drive Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
OVERVIEW
The 3M HCD-75 High Capacity Data Cartridge Drive System DOCUMENTATION
is a 1/4" tape cartridge system that can be used to record
This document, the HCD-75 User Manual, is intended to
up to 67.1 megabytes of user data on the 3M Brand
provide the user with more detailed information than may
DC600HC Data Cartridge. The HCD-75 system consists of
be found in introductory marketing material. Although
three basic components-drive module, controller module,
this manual does include some introductory information
and data cartridge-that offer the flexibility to fulfill the
about the HCD-75 system, the information is presented as
user's specific requirements. The compact design of the
a part of the more detailed information that is needed to
system itself and the high density storage capability of the
operate HCD-75 system components.
magnetic tape help to save the user both space and expense
as compared with the one-half-inch tape systems.
The HCD-75 User Manual is structured in sections, each of
which covers system components in detail and describes
The system command structure for the HCD-75 is simple
and straightforward. The HCD-75 features parallel data step-by-step procedures for operating an HCD-75 system.
input/output of 16-bit words (or optional 8-bit bytes). Installation information and specifications are presented
The system's dual, 1024-byte: I/O buffers allow asyn- in such a way as to allow the user to install and operate
chronous transfer at an average rate of approximately a system without having to refer to other sources
35 KBYTES/SEC at 60 IPS or 17.5 KBYTES/SEC at 30 IPS. of information.
Local control of all tape drive functions frees the host The sections of this manual and their central topics are:
from: