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Storage
7250
Reference manual
Xerox 7250 Reference Manual
Cartridge disk system
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Contents
Table of Contents
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Table of Contents
Table of Contents
General Description
Cartridge Disk System Configuration
Features
System Components
Introduction
Cartridge Disk System Components
Characte Ri St I Cs
IOCD Flag: Xerox 530 and Sigma
Functional Description
Equipment
Model 7250 Controller
Status Response
Cartridge Initialization
Error Checking
Model 7251/7252 Disk Drives
Operator Control Panel
Spindle Assembly
Read;Write Heads
Start-Up Cycle
Sketch of Model 7251/7252 Disk Drive
Write Protect Feature
Model 7254 Disk Cartridge
Read/Write Heads
I/OOPERATIONAL Flow
I/O Operational Flow - Xerox
Condition Codes
Service Cycles
Order out
Data out
Data in
Order in
Terminal Order
Disk Organization
Tracks
Disk Organization
Sectors
Cylinders
Data Organization
Parity
Cylinder Address
Data Presentation
Data Access
Track and Sector Incrementing
Examples of Automatic Incrementing
Error Conditions
Conditions
State Transitions
Data Transfers
System States
Operational Devices
Recommendations
Orders
Operation
Sense (X'04I)
Check-Write (X1OSI)
Read (X'121)
Test (X'13 1 )
Test Mode
Test Mode 2 (Check-Write)
Program Interface
Device Orders
Write (X 1011)
Read (X 102 I)
Seek (X I 03 1 )
Test Mode Selection
TEST MODE 2 (Read)
Key Events
Start Input/Output
Unusual End Conditions
Channel End Conditions
Fau It Conditions
Transmission Error Conditions
Incorrect Length Conditions
Status Response
Overflow and Carry Indicators
Condition Codes
Device Status Byte
Operational Status Byte
Device Status Byte for SIO, TIO, and HIO Instructions
Operational Status Byte
Additional Programming Considerations
Information Protection
Command Chaining and Data Chaining
I/O Interrupt Envi Ronment
Computers
Sequence of Activity
Disk I/O Program/Cartridge Disk System Actions
Write Order
Read Order
Seek/Sense Order
Check-Write Order
Test Order
Operations
Control Panels
Operator Control Panel
LOAD/RUN Switch
LOAD Indicator
READY Indicator
CHECK Indicator
PROTECT Indicator
Disk Drive Operator Control Panel
Controller Maintenance Panel
Controller and Maintenance Panel
Operator Control Panel Summary
Operating Procedures
General Operating Practices
Disk Drive Interlocks
System Power Turn on Procedure
Disk Drive Start up Procedure
Power Distribution Panel
PT20C Power Supply
Disk Drive Stopping Procedure
System Power Turn off Procedure
Opening Cartridge Holding Clamps
Removing Bottom Cover from Disk
Loading and Unloading a Cartridge
Placing Bottom Cover over Cartridge
Cartridge Procedures
Label Ing Cartridges
Inspecting Cartridges
Cleaning Procedures
Storing Cartridges
Usage Log
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Cartridge Disk System
Models 7250/7251/7252
Reference Manual
90 3024 A
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7251
7252
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