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Sigma 2
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XDS Sigma 2 Reference Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
1 System Design Features
General Characteristics
Real-Time and Multiusage Features
2 System Organization
Information Format
Core Memories
Central Processing Unit
Register Block
Arithmetic and Control Unit
Instruction Format
Effective Address Computation
Instruction Timing
Interrupt System
Internal Interrupt Levels
External Interrupt Levels
Interrupt Level States
Interrupt System Control
Interrupt Priority Sequence
Interrupt Routine Entry and Exit
Counter Interrupt Processing
CPU Interrupt Recognition
Protection System
3 Instruction Repertoire
Memory Reference Instructions
Conditional Branch Instructions
Copy Instruction
Direct Control Instructions
4 Input/Output Operations
Byte-Oriented I/O System
Device Number
I/Ocontrol Doublewords
Operational Status Byte
Device Orders
Device Interrupts
Device Status Byte
External Interface System
Direct-To-Memory Interface
5 Operator Controls
Control Panel
Power
Phase
Protect Progr
Interrupt Inhibit
O'flow
Carry
Parity Error
Protect
Prog Add
Key-Operated Switch
Display
Data
Appendix A. Reference Tables
Standard 8-Bit Computer Codes (EBCDIC)
This Appendix Contains the Following Reference Material:
Xdsstandard Symbol-Code Correspondences
Hexadecimal Arithmetic
Addition Table
Multiplication Table
Table of Powers of Sixteen
Table of Powers of Ten16
Hexadecimal-Decimal Integer Conversion Table
Hexadecimal-Decimal Fraction Conversion Table
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XDL5SIGMA 2 COMPUTER
Xerox Data Systems
Reference Manual
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Appendix A. Reference Tables
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Table of Contents
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