PRELIMINARY SPECIFICATIONS

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PROGRAMMED DATA PROCESSOR
MODEL THREE
(PDP-3)

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October, 1960


Digital Equipment Corporation
Maynard, Massachusetts


TABLE OF CONTENTS

INTRODUCTION1
General Description1
System Block Diagram1
Electrical Description4
Mechanical Description4
Environmental Requirements5
CENTRAL PROCESSOR6
Operating Speeds6
Instruction Format6
Number System7
Indexing8
Indirect Addressing8
Instruction List9
Manual Controls20
STORAGE22
STANDARD INPUT-OUTPUT23
Paper Tape Reader23
Paper Tape Punch24
Typewriter24
OPTIONAL INPUT-OUTPUT26
Sequence Break System26
High Speed In-Out Channel26
Magnetic Tape27
CRT Display33
Real Time Clock...

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