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Sigma 6
Reference manual
Xerox Sigma 6 Reference Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
Sigma 6 System
Introduction
General Characteristics
Basic SIGMA 6 Instruction Execution Cycle
A Typical SIGMA 6 System
Standard and Optional Features
Real-Time Features
General-Purpose Features
Time-Sharing Features
Multiuse Features
Sigma 6 System Organization
Information Format
Core Memory
Dedicated Memory Locations
Information Boundaries
Computer Modes
Master Mode
Slave Mode
CPU Fast Memory
Information Boundaries
Central Processing Unit
SIGMA 6 Central Processing Unit
General Registers and Register Block Pointer
Memory Control Storage
Memory Map and Access Protection
Instruction Format
Immediate Operand
Memory Reference Addresses
Memory Address Control
Memory Map and Access Protection
Index Displacement Alignment
Memory Write Locks
Generati on of Actua I Memory Addresses
Program Status Doubleword
Interrupt System
Internal Interrupts
SIGMA 6 Interrupt Locations
External Interrupts
States of an Interrupt Level
Control of the Interrupt System
Time of Interrupt Occurrences
Single-Instruction Interrupts
Trap System
Nonallowed Operation Trap
Summary of SIGMA 6 Trap System
Unimplemented Instruction Trap '24
Push-Down Stack Limit Trap
Fixed-Point Overflow Trap
Floating-Point Arithmetic Fault Trap
Decimal Arithmetic Fault Trap
Watchdog Timer Runout Trap
Call Instruction Traps
Instruction Repertoire
Glossary of Symbolic Terms
Load/Store Instructions
Load/Store Instructions
Analyze/Interpret Instructions
ANALYZE Table for SIGMA 6 Operation Codes
Fixed-Point Arithmetic Instructions
Comparison Instructions
Logical Instructions
Cant Word, (R)
Word, (R) = ED
Obit 0 of Register R Is a 0 and Bit Positions
Shift Instructions
Affected: (R), CC3, CC4
Condition Code Settings
Of Register R Contain at Least One
Floating-Point Shift
Conversion Instructions
Floating-Point Arithmetic Instructions
Floating-Point Numbers
O Bit 0 of Register R Is a
Of Register R Contain at Least One
Floating-Point Number Representation
Floating-Point Add and Subtract
Floating-Point Multiply and Divide
Instructions
Condition Code Settings for Floating-Point Instructions
Decimal Instructions
Packed Decimal Numbers
Zoned Decimal Numbers
Decimal Accumulator
Decimal Instruction Format
Illegal Digit and Sign Detection
Overflow Detection
Decimal Instruction Nomenclature
Condition Code Settings
Byte-String Instructions
Push-Down Instructions
Stack Pointer Doubleword
Push-Down Condition Code Settings
Execute/Branch Instructions
Instructi Ons
Control Instructions
Program Status Doubleword
Loading the Memory Map
Loading the Access Protection Controls
Loading the Memory Write Protection Locks
Interruption of MMC
Read Direct Internal Computer Control (Mode 0)
Write Direct Internal Computer Control (Mode 0)
Write Direct, Interrupt Control (Mode 1)
Input/Output Instructions
I/O Address
I/O Unit Address Assignment
I/O Status Response
Status Information for SIO
Status Bits for I/O Instructions
Input/Output Operations
Lop Command Doublewords
Order
Memory Byte Address
Flags
Byte Count
Operator Controls
Processor Control Panel
Power
Cpu Reset/Clear
I/O Reset
Load
Unit Address
System Reset/Clear
Normal Mode
Run
Wait
Interrupt
Program Status Doubleword
Insert
Instr Addr
Addr Stop
Program Status Doubleword Display
Select Address
Store
Display
Data
Compute
Control Mode
Memory Fault
Alarm
Audio
Watchdog Timer
Interleave Select
Parity Error Mode
Phases
Register Select
Sense
Clock Mode
Loading Operation
Load Procedure
Load Operation Details
Xdsstandardsymbolsandcodes
XDS Standard Character Sets
Control Codes
Special Code Properties
XDS Standard 8-Bit Computer Codes (EBCDIC)
XDS Standard 7-Bit Communication Codes (ANSCII)
XDS Standard Symbol-Code Correspondences
Hexadecimal Arithmetic
Addition Table
Multiplication Table
Table of Powers of Sixteenl0
Hexadecimal-Decimal Integer Conversion
Table
Table
Hexadecimal-Decimal Fraction Conversion
Table of Powers of Two 118
Mathematical Constants 118
Reference Diagrams
Notes on Basic SIGMA 6 Instruction Execution
Floati Ng-Point Instruction Execution
Floating-Point Multiplication and Division
Floating-Point Addition and Subtraction
Floating-Point Shift
Edit Byte String Instruction Execution
Sigma 6 Instructions (Mnemonics)
Instruction Timing
Basic Instruction Timing
Additional Instruction Timing
Index
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