Control Data 3100 User manual

COMPUTER SYSTEM
REFERENCE MANUAL
CONTROL DATA
CORPORATION

60108400
Record of Revisions
REVISION NOTES
A
Obsoletes previous editions.
B
Publications Change Order 11527 which incorporates
(9-27-65)
extensive revisions into this manual.
This edition
obsoletes previous editions.
Pub. No. 60108400
September 1965 Address comments concerning this manual
to:
Control Data Corporation
Technical Publications Department
4201 North Lexington Avenue
©1965, Control Data Corporation
Printed in the United States
of America St. Paul, Minnesota 55112
Or use Comment Sheet in back of this manual.

CONTENTS
Section 1. SYSTEM DESCRIPTION
INTRODUCTION ................................................................... 1-1
COMPUTER MODULARITY. .. . .. . . . .. .. . .. . . . .. .. .. . .. .. . . . .. .. . . . .. .. .. . . .. . .. . ... 1-1
Main Control and ArithmeticModule ......... , ........ , ........................... 1-3
Block Control and Interrupt Module. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . .. 1-3
Storage Module. . . . . . . . . . . . .. . . . . . . . . . . . . . .. . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . .. 1-3
Input/Output Sub-Modules. . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . . . . . . . . . . .. .. 1-3
Optional Arithmetic Module .......................... , ........ , .................. 1-4
Consoles. . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . .. . . .. . . . . . . . . . . . . . . . . . . . . . .. . . .. 1-4
Power Control Panel ..... , .................. , .................................... 1-7
3104 COMPUTER .. , ............................................................... 1-7
COMPUTER ORGANIZATION. . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . .. . . . . .. . . . . . .. 1-7
Computer Word Format .......................................................... 1-7
Register Descriptions. . . . . . . .. . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .. 1-7
Data Bus and (S' Bus ............................................................. 1-11
Block Control ................................................................... 1-11
Integrated Register File ......................................................... 1-12
Real-Time Clock ................................................................. 1-12
Parity ......................................................................... 1-13
PERIPHERAL EQUIPMENT ........................................................ 1-14
Section 2. STORAGE CHARACTERISTICS
STORAGE MODULE CONTROL PANEL. . . .. .. .. . .. .. . .. .. . . .. . . .. .. .. . .. . .. .. .. . ... 2-1
STORAGE REGISTERS. . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . . . . . . . . .. . .. 2-2
S Register. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . .. 2-2
Z Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . .. . . .. . . . . . . . . . . . .. 2-2
READ/WRITE CHARACTERISTICS . . . . . . . . . . . .. .. . .. . . . . . . .. .. .. ... . . . .. .. . . .. .. ... 2-2
Single-CharacterMode. . . . . . . . . . . . . . . . . . .. . . . . .. . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .. 2-2
Double-Character Mode. . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . . . . . . . . . . . .. . . . . . .. . . . . . . .. 2-2
Triple-Character Mode. . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . . .. . . .. . . . . . . . . . .. 2-2
Full-Word Mode ................................................................. 2-2
Address Mode ............ , ................. , ........ " ................. , ........ 2-2
STORAGE ADDRESSING. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . . . . . . . . . . . . .. 2-3
STORAGE SHARING. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . .. . . .. . . . . . . .. 2-3
STORAGE PROTECTION. . . . . .. . . .. . .. .. . .. . .. . . .. .. .. . . ... .. . . . .. . .. .. . . .. .. . .. ... 2-3
Permanent Protection ................................ , ................. , ........ 2-4
Selective Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . .. . . . .. . .. 2-4
No Protection. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . . . .. . . .. . . . . .. 2-4
Section 3. INPUT/OUTPUT CHARACTERISTICS
INTERFACE SIGNALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . .. . . .. 3-1
I/O PARITY ........................................................................ 3-2
Parity Checking with the 3106 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-2
Parity Checking with the 3107 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-2
iii
Rev. B

AUTO LOAD/AUTO DUMP. . . . . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .... 3-3
Preliminary Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. 3-3
Auto Load ..... -. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-3
Auto Dump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-3
3100 Auto Load/Auto Dump Interim Subroutine ... '" ................. " .......... 3-3
SATELLITE CONFIGURATIONS .................................................... 3-5
Section 4. INTERRUPT SYSTEM
GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-1
INTERRUPT CONDITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-1
Internal Interrupts .............................................................. 4-1
Trapped
Instruction Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-2
Power Failure Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-2
I/O Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
INTERRUPT MASK REGISTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
INTERRUPT CONTROL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
Enabling or Disabling Interrupt Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-4
Interrupt Priority ............................................................... 4-4
Sensing Interrupts- ....................... -. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-4
Clearing Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-4
INTERRUPT PROCESSING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-5
Section 5. CONSOLES AND POWER CONTROL PANEL
CONSOLES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-1
Register Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 5-1
Console Loudspeaker
.......................................................... " 5-4
Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-4
Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-7
POWER CONTROL PANEL ......................................................... 5-15
Switches ........................................................................ 5-15
Elapsed Time
Meters ............................................................ 5-15
Section 6. TYPEWRITER
DESCRIPTION ...... - ............................................................... 6-1
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-2
Set Tabs, Margins, and Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-2
Clear ........................................................................... 6-2
Status Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-2
Type In and Type Load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-3
Type Out and Type Dump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-3
CONSOLE SWITCHES AND INDICATORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-3
CHARACTER CODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-5
Section 7. INSTRUCTIONS
GENERAL INFORMATION ......................................................... 7-1
Instruction Word Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-1
iv

Word Addresses vs. Character Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-2
Symbol Definitions. . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-3
Indexing
and Address Modification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-3
Addressing Modes. . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .
.. 7-4
Indexing
and Addressing Mode Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-5
I/O Channel Considerations .................................................... " 7-6
Trapped
Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-6
INSTRUCTION LIST ............................................................... " 7-7
Register OperationswithoutStorage Reference
..................................... 7-12
Load
........................................................................... 7-20
Store
.......................................................................... 7-23
Inter-registerTransfer, 24-bit Precision
.......................................... 7-26
Inter-register Transfer, 48-bit Precision
.......................................... 7-29
Stops and Jumps ................................................................ 7-30
Logical Instructions with StorageReference ........................................ 7-37
Arithmetic, Fixed Point, 24-bit Precision
.......................................... 7-38
Arithmetic, Fixed Point, 48-bit Precision
.......................................... 7-40
Arithmetic, Floating
Point ....................................................... 7-43
BCD
........................................................................... 7-46
Storage Shift, Searches, Compare
and Register Shifts ............................... 7-50
Search .................. - ........................................................ 7-56
Move
.................................................................. ~ ........ 7-58
Sensing ........................................................................ 7-60
Control
........................................................................ 7-63
Interrupt ....................................................................... 7-65
Input/Output ................................................................... 7-68
Section 8.
SOFTWARE SYSTEMS
GENERAL DESCRIPTION. . . . . . . . . . . . . . . . .. .. .. . .. .. .. .. .. .. .. .. .. .. . .. .. .. .. .. ... 8-1
3100, 3200, 3300 SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-1
3100, 3200, 3300 COMPASS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-2
3100,3200,3300 Data Processing Package ....................................... 8-3
3100,3200,3300 Utility ......................................................... 8-4
3100, 3200, 3300 COBOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. 8-4
3100, 3200, 3300 FORTRAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. 8-5
Generalized Sort/Merge
Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .. 8-5
3100, 3200, 3300 BASIC System. . . . . . .. . . . . . . . . . . . . .. . . .. . . . . . . . . . . . . . . . . . . .. . . .. 8-6
CODING PROCEDURES. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-7
Instruction
Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-7
Pseudo-Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-9
Assembly Listing
Format ........................................................ 8-17
Error Codes .................................................................... 8-18
APPENDIX
A-Control Data 3100,3200,3300 Computer Systems Character Set
B- Supplementary Arithmetic Information
C- Programming Reference Tables
and Conversion Information
GLOSSARY, INSTRUCTION TABLES AND INDEX
v
Rev. B

FIGURE FIGURES
1-1 3100 Modular Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-2
1-2 3101 Console. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 1-5
1-3 3200 Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 1-6
1-4 Computer Word
Character Positions and Bit Assignments .......................... 1-7
1-5 Storage Addressing
and Data Paths of Typical Installation ......................... 1-11
1-6
Parity Bit Assignments ......................................................... 1-13
2-1 Storage Module Control
Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1
3-1 Principal Signals Between I/O Channel and External Equipment ................... 3-1
3-2
Satellite Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-5
5-1
Front View of Integrated Console. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-2
5~2 EUEL Register Display ......................................................... 5-3
5-3 ED Register Display . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 5-3
5-4
External Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-4
5-5
Internal Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-5
5-6
Temperature Warning Designations for an Expanded 3100 Computer, Front View .... 5-6
5-7 Console
Keyboard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-8
5-8 Breakpoint Switch Examples
.................................................... 5-13
5-9 Power Control
Panel ............................................................ 5-16
6-1 3192 Console
Typewriter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-1
6-2 Typewriter Control
Panel ....................................................... 6-3
7-1 Word-Addressed Instruction
Format .............................................. 7-1
7 -2 Character-Addressed Instruction Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-2
7-3 Indexing
and Indirect Addressing Routine Flow Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-3
7-4 Operand Formats and Bit Allocations for MUAQ and DVAQ Instructions ............ 7-41
7-5 Operand
Formats and Bit Allocations for Floating Point Arithmetic Instructions ..... 7-45
7-6 Search Operation .............................................................. 7-57
7
-7 Move Operation ................................................................ 7-59
7-8 73 I/O Operation
with Storage ................................................... 7-73
7-9 74 I/O Operation
with Storage ................................................... 7-75
7-1075 I/O Operation with Storage ................................................... 7-77
7-11 76 I/O Operation
with Storage ................................................... 7-79
7-1273 I/O Operation
with A ......................................................... 7-81
7-1374 I/O Operation with A ......................................................... 7-83
7-1475 I/O Operation
with A ........................................................ 7-85
7-1576 I/O Operation
with A ........................................................ 7-87
8-1 COMPASS Coding Form
........................................................ ·8-19
8-2 FORTRAN Coding Form ........................................................ 8-19
~ev. B vi

TABLE TABLES
1-1 Optional Memory Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-3
1-2 Characteristics
of 3100 Computer Registers ....................................... 1-10
1-3 Register File Assignments ...................................................... 1-13
2-1 Absolute Addresses ............................................................. 2-3
2-2 Auto LoadlAuto Dump Reserved Addresses. . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .
.. 2-4
2-3 Storage Protection Switch Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 2-5
2-4 Storage Protection Switch
Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-5
4-1
Interrupt Mask Register Bit Assignments ......................................... 4-3
4-2
Interrupt Priority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-4
4-3 Representative
Interrupt Codes .................................................. 4-5
5-1 Keyboard Switch
Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-9
5-2 Console
Main-Frame Switches ................................................... 5-10
5-3 Power Control Panel Switch Functions ............... , .. " ........ , .............. 5-15
6-1 Console Typewriter Switches
and Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-4
6-2 Console Typewriter Codes
....................................................... 6-5
7
-1 List of Trapped Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-7
7-2 Instruction Synopsis
and Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-8
7-3
Summary ofInstruction Execution Times ......................................... 7-11
7-4
Interrupt Mask Register Bit Assignments ......................................... 7-61
7-4a
Bit Assignments for Interrupt Sensing Conditions ................................. 7-61
7-5
Internal Status Sensing Mask ................................................... 7-62
7
-6 Block Control Clearing Mask .................................................... 7-63
7-7
Pause Sensing Mask .................................................. , ......... 7-64
7-8
Interrupt Mask Register Bit Assignments ......................................... 7-65
7
-9 Modified I/O Instruction Words .................................................. 7-69
8-1 Instruction
Interpretations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-8
8-2 COMPASS Coding Form Description
............................................. 8-18
vii Rev. B

Section 1
SYSTEM DESCRIPTION
INTRODUCTION
The CONTROL DATA * 3100 is a medium-sized, solid-state, general-purpose digital
computing system. Advanced design techniques are used throughout the system to
provide expedient solutions for scientific, real-time, and data processing problems.
Modular packaging facilitates expansion of the basic 3100 System to accommodate
increasing customer needs.
The 3100 is upwards compatible with the CONTROL DATA 3200 and 3300 Computer
Systems; i.e., as computation requirements exceed the capabilities of the 3100 System,
the user may escalate to a 3200 or 3300 System without the necessity to revise existing
3100 programs. Its input/output characteristics are identical to the 3200, 3300, 3400,
3600
and 3800 Computer Systems - a fact which facilitates incorporating the 3100 into
a SATELLITE * configuration.
Various software systems are available for the 3100 System. The SCOPE operating
system is used in 3100 Systems to provide efficient job processing. SCOPE requires a
minimum of storage and time requirements. COMPASS, operating under the control
of SCOPE, is the assembly system used to assemble relocatable machine language
programs. Other applicable software includes FORTRAN, COBOL, the Data Processing
Package, Generalized Sort/Merge and Basic System. These systems are described in
the Software Section of this manual. Other software and hardware publications perti-
nent to 3100 Systems may be obtained from the nearest Control Data sales office listed
on the back cover of this manual.
A wide selection of peripheral equipment is available for use in a 3100 System. Equip-
ment that is applicable for 3100 Systems may be found in the 3000 Series Computer
System Peripheral Equipment Reference Manual, publication number 60108800.
This manual provides programming and operating information in conjunction with a
description of special features of the 3100. Reference information and supplementary
information may be found in the Appendix section.
COMPUTER MODULARITY
A 3100 Computer consists of various logic cabinet modules designed to perform specific
operations. If additional storage, input/output channels, or arithmetic capabilities are
desired for an existing installation, an appropriate module is integrated into the system.
The 3104 (Figure 1-1), described later in this section, constitutes the basic 3100 modular
configuration.
*Registered trademarks of Control Data Corporation
1-1

~~
l=r I
I
N
T SPACE
E
FOR 8K 4K BLOCK SPACE
FOR
G STORAGE STORAGE CONTROL OPTIONAL
MAIN CONTROL POWER
R
MODULE
MODUL E
AND
ARITHMETIC
AND
CONTROL
A (OPTIONAL) (8K
OPTIONAL)
INTERRUPT
MODULE
ARITHMETIC MODULE
PANEL
T
MOD ULE
r--
E
D
C
0
N
S
------ --- ---
------
0
L I/O
MOD ULE
I/O MODULE
E
CHANNELS
UNUSED
CHANNELS
2 AND 3 AREA
OAND 1
(O PTIONAL )
(1 OPTIONAL)
l--
l 1
Figure 1-1. 3100 Modular Configuration
Rev. 8 1-2

MAIN CONTROL AND ARITHMETIC MODULE
This module, standard in all 3100 systems, controls internal operations, executes 24-bit
precision fixed
point arithmetic and 48-bit precision fixed point addition and subtraction
instructions. Boolean, character word processing, and decision operations are also processed
by
this module. Floating point, BCD, and 48-bit precision multiplication and division in-
structions are classified as trapped instructions if the optional arithmetic module is absent
from the system. Trapped instructions may be processed under control of an interpretive soft-
ware routine.
BLOCK CONTROL AND INTERRUPT MODULE
Logic associated with this module controls Search and Move operations, external equip-
ment and typewriter 110, real-time referencing, and operations with the register file. In-
terrupt logic, also located in this module, processes Internal, 110, Trapped Instruction, and
Power Failure interrupts.
STORAGE MODULE
A unique 4,096-word memory module is standard in e:very 3100 System. A customer may
select combinationsofmagnetic core storage (MCS) modules to increase the total storage
capacity of his computer system to 8,192; 16,384 or 32,768 words. The following optional
storage modules are available:
• 3108-4,096-word (16,384 characters) MCS memory expansion unit. This unit
is used only to expand the standard 4,096 word memory to 8,192 words.
• 3109- 8,192-word (32,768 characters) MCS memory module (requires additional
chassis).
• 3103 -16,384-word (65,536 characters) MCS memory module (requires addi-
tional chassis).
Memory configurations are shown in Table 1-1.
TABLE 1-1. OPTIONAL MEMORY CONFIGURATIONS
Total Expanded Memory Modules Required in
Memory Capacity
Addition to 4K Memory in 3104
8K 3108
16K
3108 and 3109
32K 3108.3109 and 3103
INPUT! OUTPUT SUB-MODULES
Two types of I/O Channels are available:
3106 Communication Channel (12-bit)
3107 Communication Channel (24-bit)
3106
The 3106 is a bidirectional 12-bit, parallel data channel. A maximum of four 3106
channels may be used in a 3100 System and up to eight peripheral controllers may be
connected to each channel. Cabinet space is provided for mounting two 3106 channels
per I/O module.
1-3
Rev. B