RCA 70/46 User Manual

INTRODUCTION
SYSTEM STRUCTURE
INSTRUCTION
FORMATS
ADDRESSING
PROGRAM INTERRUPT
INPUT/OUTPUT
OPERATION
CONTENTS
RCA Model 70/46 Processor ................................. .
Organization of Data ....................................... .
Data Formats .............................................. ~
Page
1
3
3
Numbering System. .. . . .. . . . . .. .. . . .. . . . . .. . . . . . . . . . . . . . . . . . 3
Main Memory .............................................. .
Non-Addressable
Main Memory ............................... .
Scratch-Pad Memory ........................................ .
Translation Memory ........................................ .
Read-Only Memory ......................................... .
Program Control and Arithmetic Unit ......................... .
Input/Output Control ....................................... .
Interval Timer ............................................. .
RR Format
RX Format
RS Format
SI Format
SS Format
Memory Address Translation ................................. .
Introduction ............................................... .
4
4
4
5
6
6
8
8
9
9
9
10
10
12
16
Processor States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Processing State PI ...................................... 16
Interrupt Response State P
2
•••••••••••••••••••••••••••••• 16
Interrupt Control State P
3
••••••••••••••••••••••••••••••• 16
Machine
Condition State P 4 ••• • • • • • • • • • • • • • • • • • • • • • • • • • • • • 16
Processor State Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
General
Registers ....................................... 18
Floating-Point Registers ................................. 18
Interrupt Status Registers ............................... 18
Interrupt Mask Registers ................................ 20
Program Mask Registers ................................. 20
Register Addressing ..................................... 21
Interrupt Flag Register .................................. 21
Interrupt Conditions ......................................... 23
Interrupt Mechanization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Automatic Interrupt ..................................... 23
Program Controlled Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Introduction ............................................... .
Input/Output Channels ...................................... .
Selector
Channels ............................ .......... .
36
36
36
MUltiplexor Channel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
iii

RCA 70/46 Specifications

General

Brand	RCA
Model	70/46
Category	Computer Hardware
Language	English