PRELIMINARY SPECIFICATIONS

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PROGRAMMED DATA PROCESSOR
MODEL THREE
(PDP-3)

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October, 1960

Digital Equipment Corporation
Maynard, Massachusetts

INTRODUCTION			[1]
	General Description	[1]
	System Block Diagram	[1]
	Electrical Description	[4]
	Mechanical Description	[4]
	Environmental Requirements	[5]
CENTRAL PROCESSOR			[6]
	Operating Speeds	[6]
	Instruction Format	[6]
	Number System	[7]
	Indexing	[8]
	Indirect Addressing	[8]
	Instruction List	[9]
	Manual Controls	[20]
STORAGE			[22]
STANDARD INPUT-OUTPUT			[23]
	Paper Tape Reader	[23]
	Paper Tape Punch	[24]
	Typewriter	[24]
OPTIONAL INPUT-OUTPUT			[26]
	Sequence Break System	[26]
	High Speed In-Out Channel	[26]
	Magnetic Tape	[27]
	CRT Display	[33]
	Real Time Clock	[33]
	Line Printer	[34]
UTILITY PROGRAMS			[35]
	FRAP System	[35]
	DECAL System	[35]
	Floating Point Subroutines	[36]
	Maintenance Routines	[37]
	Miscellaneous Routines	[37]

TABLE OF CONTENTS