IBM 29 User Manual

Contents
ISM 29 Card Punch, with Left-Zero Insertion . . . . . . 1-1
Comprehensive Introduction . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Left-Zero Program Card . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Left-Zero Error Reset Key . . . . . . . . . . . . . . . . . . . . . . . 1-2
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Read-In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
BCD Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Read-in Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Read-out, Punch-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Punch-out Timing (8-Column Field) . . . . . . . . . . . . . . . . 1-9
Left-Zero Credit Field . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Credit Read-in .................................. 1-12
Credit Read-out, Punch-out ....................... 1-13
Punch-out Timing (3-Column Credit Field) .......... 1-13
Left-Zero Logic Controls .......................... 1-15
Purpose of Left-Zero Relays and Points . . . . . . . . . . . 2-1
Instructional Wiring Diagram . . . . . . . . . . . . . . . . . . . . 3-1

IBM 29 Specifications

General

Brand	IBM
Model	29
Category	Computer Hardware
Language	English