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TECHNICAL rrIE 5-0054
. IJ IN'FORMATION February 16, 1965
: EXCHANGE 8 pages
Revised 9/8/65
IO
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IBM 1401 rrAPE IOCS TIJVIING CALCULATION FORMULAS
To:m Scharf
IBM Corp.
DP Custonler Education
Gladengvn 3 B
Oslo, Norway
FOR IBM INTERNAL USE ONLY
This paper is in the author's ()riginal form.
Th~~ objecti.ve in providing this copy is to
keep you informed in your field of interest.
Please do not distribute this paper to persons
outside the Company.
Distr ibuted by
DPD Program Information Department
IBM Corporation
112 East Post Road TIE 5-0054
White Plains, New York
In:M: 1401 TAPE IOCS TIMING CALCULATION
FORMULAS ABSTRACT
The 1401 IOCS for a tape-based system has an un-
Author: Torn Scharf
expectedly high processing time which can be as high
Date: January 12th 1965
as 110% of the pure tape time itself. Obviously this
important factor must be taken into account for any
timing calculation but these figures are not, to the au-
thors knowledge, previously published. The formulas
are worked out on the basis of a typical fixed blocked
DTF using a combination read/write DIOCS subroutine.
Direct
The exact time for every single instruction which is
In qui r i e s t 0 : TOM SCHARF
normally run through was calculated. The timings thus
IBM DP CUSTOMER EDUCATION
calculated theoretically correlate very well with actual
GLADENGVN 3B
timing comparisons performed with and without IOCS.
OSLO
NORWAY
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FACTOR
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