Xerox 7251 Manuals

Manuals and User Guides for Xerox 7251. We have 1 Xerox 7251 manual available for free PDF download: Reference Manual

Xerox 7251 Reference Manual

Xerox 7251 Reference Manual (40 pages)

Cartridge Disk System

Brand: Xerox | Category: Storage | Size: 2 MB

Table of Contents

Table of Contents
5
General Description
7
Cartridge Disk System Configuration
7
- Features
  8
- System Components
  8
Introduction
7
Cartridge Disk System Components
8
Characte Ri St I Cs
8
- IOCD Flag: Xerox 530 and Sigma
  9
Functional Description
10
Equipment
10
- Model 7250 Controller
  10
  - Status Response
    10
  - Cartridge Initialization
    10
  - Error Checking
    10
- Model 7251/7252 Disk Drives
  10
  - Operator Control Panel
    10
  - Spindle Assembly
    11
  - Read;Write Heads
    11
  - Start-Up Cycle
    11
Sketch of Model 7251/7252 Disk Drive
11
- Write Protect Feature
  12
- Model 7254 Disk Cartridge
  12
Read/Write Heads
12
I/OOPERATIONAL Flow
12
I/O Operational Flow - Xerox
13
Condition Codes
14
- Service Cycles
  15
  - Order out
    15
  - Data out
    15
  - Data in
    15
  - Order in
    15
  - Terminal Order
    15
Disk Organization
15
- Tracks
  15
Disk Organization
16
- Sectors
  17
- Cylinders
  17
- Data Organization
  17
  - Parity
    17
  - Cylinder Address
    17
  - Data Presentation
    17
  - Data Access
    17
    
    Track and Sector Incrementing
    17
    
    Examples of Automatic Incrementing
    18
    
    Error Conditions
    18
Conditions
18
State Transitions
18
- Data Transfers
  19
System States
18
- Operational Devices
  18
Recommendations
19
Orders
20
Operation
20
- Sense (X'04I)
  21
- Check-Write (X1OSI)
  21
- Read (X'121)
  21
- Test (X'13 1 )
  21
  - Test Mode
    21
  - Test Mode 2 (Check-Write)
    21
Program Interface
20
Device Orders
20
- Write (X 1011)
  20
- Read (X 102 I)
  20
- Seek (X I 03 1 )
  20
Test Mode Selection
21
- TEST MODE 2 (Read)
  22
Key Events
22
- Start Input/Output
  22
- Unusual End Conditions
  22
- Channel End Conditions
  22
- Fau It Conditions
  22
- Transmission Error Conditions
  22
- Incorrect Length Conditions
  22
Status Response
23
- Overflow and Carry Indicators
  23
- Condition Codes
  23
- Device Status Byte
  23
- Operational Status Byte
  23
Device Status Byte for SIO, TIO, and HIO Instructions
24
Operational Status Byte
26
Additional Programming Considerations
26
- Information Protection
  26
- Command Chaining and Data Chaining
  26
- I/O Interrupt Envi Ronment
  26
  - Computers
    26
- Sequence of Activity
  26
Disk I/O Program/Cartridge Disk System Actions
27
Write Order
28
Read Order
29
Seek/Sense Order
30
- Check-Write Order
  31
- Test Order
  32
Operations
33
Control Panels
33
- Operator Control Panel
  33
  - LOAD/RUN Switch
    33
  - LOAD Indicator
    33
  - READY Indicator
    33
  - CHECK Indicator
    33
  - PROTECT Indicator
    33
- Disk Drive Operator Control Panel
  33
- Controller Maintenance Panel
  34
- Controller and Maintenance Panel
  34
Operator Control Panel Summary
34
Operating Procedures
35
- General Operating Practices
  35
- Disk Drive Interlocks
  35
- System Power Turn on Procedure
  35
- Disk Drive Start up Procedure
  35
- Power Distribution Panel
  36
- PT20C Power Supply
  36
- Disk Drive Stopping Procedure
  37
- System Power Turn off Procedure
  37
- Opening Cartridge Holding Clamps
  38
Removing Bottom Cover from Disk
38
Loading and Unloading a Cartridge
38
Placing Bottom Cover over Cartridge
38
Cartridge Procedures
39
- Label Ing Cartridges
  39
- Inspecting Cartridges
  39
- Cleaning Procedures
  40
- Storing Cartridges
  40
- Usage Log
  40

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