Service Manuals, User Guides, Schematic Diagrams or docs for : IBM 140x Z77-5054_tapeIOCStiming

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U~~
           TECHNICAL                                        rrIE 5-0054
    . IJ   IN'FORMATION                                     February 16, 1965
:          EXCHANGE                                         8 pages
                                                            Revised   9/8/65
                                                            IO

                                                            _~~ 11 - Sb5'1




           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
:BLOC.K '                    II/D}       7~ IceS - V{C'~.
FACTOR
     ~oo       E ART SHOWINEt ~E.lATION5H'P B

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