October 28, 1964


MEMORANDUM TO:  Users of 1401 Autocoder System

SUBJECT:        1401 Autocoder System, Program #1401-AU-037,
                Version 3, Modification Level 9



This modification letter has been prepared for distribution to all
users of the 1401 Autocoder System and contains changes to
Version 3, Modification Level 8 of that system.

The following minor restrictions are in effect:

Restrictions
------------

The Branch if Minus (BM) instruction cannot be chained by the use of
another BM with blank operands.  A chain can be affected by using a
BM xxx, yyy    followed by a BWZ (branch if wordmark or zone) or
followed by the CHAIN macro.

A comments card without an asterisk will cause a 777 halt to occur.

There are no materials distributed with this letter.

Any changes in mailing address should be directed to the attention of the
Manager of the Program Information Department, IBM Corporation
112 East Post Road, White Plains, New York.

This program has been registered by system tape and is listed under the
name and address shown on your order.  Program modifications as and
when made by IBM will be sent to this same address.  Should there be a
change in your system type or in your address, or should you no longer
need maintenance of this particular program, we would appreciate your
notifying your IBM branch office.


                                 PROGRAM INFORMATION DEPARTMENT


                                         WSC - Bethesda
                                         183/Systems & Procedures
                                         November 10, 1964



MEMORANDUM
----------

TO:       Department 183

SUBJECT:  Autocoder Processor Version 3, Level 9


The following restrictions may exist:

    Group mark and tape mark literals will not be correctly assembled
    within the same overlay or program section.  We suggest that group
    mark literals be declared as DCWs.

    Negative address adjustment below zero will not be assembled cor-
    rectly; i.e., there is no "wrap around" effect in address adjustment.

    Blank origins following DAs may not be correctly assembled.

    Comments cards appearing between the CTL and DIOCS cards will
    cause assembly errors during reassembly and regeneration of IOCS.

    When re-assembling with alterations, insertion of instructions or con-
    stants immediately following sequence number 103 will not be assem-
    bled correctly.

    When using the loadable tape option, signed DCW's following DSA's
    will not have the zone bits correctly assembled.

    Indexing will be assembled on equated labels only as defined in the
    EQU statement itself.  No indexing prevoiously defined on the symbol
    appearing in the operand of the EQU statement will be retained.

    Columns 16 through 18 of a comments card (* in col. 6) may not con-
    tain END.

    Negative character adjustment in the A operand will not be correctly
    assembled if the B operand is a group mark alphameric literal.

    When using the loadable tape output option, area definition literals
    (#xx) of greater than 32 positions may not be correctly assembled.

Page 2                                   November 10, 1964


    3 and 4 character alphameric literals which are identical except for a
    double @ *i.e., @XXX@ and @XXX@@) can not be generated correctly
    by the processor.

    When reassembling with alterations no instructions can be changed
    immediately after the last GENIO instruction.

    When reassembling with alterations on IOCS programs, regeneration
    of IOCS can not be correctly completed if a previous reassembly has
    altered within the GENIO instructions.

    The Branch if Minus (BM) instruction cannot be chained by the use of
    another BM with blank operands.  A chain can be effected by using a
    BM xxx, yyy followed by a BWZ (branch if wordmark or zone) or followed
    by the CHAIN macro.

    A comments card without an asterisk will cause a 777 halt to occur.

    Comments cards should not follow an "ENT" statement as page overflow
    will be incorrect.

    CALL or INCLD should not be punched in columns 16-19 or 16-20 re-
    spectively of a comments card.

    If an adcon is used within a suffixed area, there should also be a LTORG
    in that suffixed area.  If not, the adcon will be defined with an address in
    the last suffix area in which it appeared.

    Alterations cannot be made to sequence numbers greater than 9999.

    The label of an ORG statement immediately following an EQU*+1 will be
    assigned an address one greater than the address assigned the equate.

    The highest core position may be exceeded without a flag if the operation
    code of the instruction falls within core, but the remainder goes over
    core.

    Multiply defined tags will not be put out when iterations are made.


                                             R. W. Weaver

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