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Random Access Method
of Accounting and Control
/
305 RAMAC
Random Access Method
of Accounting and Control
Manual of Operation
M A J0 R REV I S ION (April 1957)
This edition, Form 22-6264-1, obsoletes Form 22-6264-0 and all earlier editions.
Major changes are:
PAGE
~
30 Field Compare
45 Programmed Division
74 380 Console
89 380 Console Typewriter
102 370 Printer
126 323 Card Punch
133 Error Correction Procedures (323 )
@1957 by
International Business Machines Corporation
590 Madison Avenue, New York 22, N. Y.
Printed in U. S. A.
Form 22-6264-1
CONTENTS
IN-LINE PROCESSING 5
INTRODUCTION 5
IBM Punched Card Approach - 6
IBM 305 RAMAC Approach - 8
System Organization 10
PROGRAMMING 15
Loading the Program 24
Loading the Disk Storage 33
Unloading the Disk Storage 36
Arithmetic Operations 37
A vailability Editing 40
Other Logic Elements 47
A SAMPLE PROGRAM 50
DISK STORAGE ORGANIZATION 61
INTERNAL CHECKING 70
380 CONSOLE 74
EXAMPLES OF CONSOLE OPERATION- 85
Start - Stop Procedures 85
Inquiries 85
Error Correction 85
Alterations to Drum Tracks 87
Testing Procedures - 88
3 80 CONSOLE TYPEWRITER 89
Typewriter Control Panel 90
370 PRINTER 102
Operating Keys and Lights 104
Prin ter Control Panel 105
Tape-Controlled Carriage 113
Opera ting F ea tures - 116
Form Control - 117
Multiple Line Printing 121
Timing Charts 124
323 CARD PUNCH - 126
Feed and Punch Unit 127
Opera ting Keys and Lights 127
323 Control Panel - 128
Error-Correction Procedures 133
CONTROL PANEL SUMMARY 137
CODING 147
INDEX 149
RAM A C is a generic term that has been
coined to mean Random Access Method of Accounting and Control.
The IBM 305 is the first of a series
of machines designed to approach in-line accounting
on a mechanized basis. This approach requires the use of a
storage device that permits rapid access to any of
several million characters of data comprising the accounting records.
IBM 305 RAMAC
IN-LINE PROCESSING raw material account. The next transaction could re-
flect the fact that some of the raw material had
entered the manufacturing process, in which case the
BEFORE the development of mechanized accounting,
clerk would subtract this amount from the raw mate-
business records were maintained in a series of ledgers
rial account and add it to the material-in-process ac-
by clerks who posted each transaction to the proper
count. However, it is more probable that the next
accounts. For example, if a manufacturing company
transaction would affect entirely different accounts.
bought raw material, the clerk subtracted the cost of
Perhaps some of the finished products were sent to
the material from the cash account and added the
the wholesaler. This transaction would affect the in~
cost to the raw material account. This