July 23, 1963


MEMORANDUM TO:  Users of 1401 Autocoder System

SUBJECT:        1401 Autocoder System, Program #1401-AU-037,
                Version 3, Modification Level 7



This modification letter has been prepared for distribution to all
users of the 1401 Autocoder System and contains changes to
Version 3, Modification Level 6 of that system.

The following additional minor restrictions are in effect with regard
to the use of 1401 Autocoder:

     1.  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.

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

     3.  Blank origins following DAs may not be assembled correctly.

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

     5.  When re-assembling with alterations, insertion of
         instructions or constants immediately following sequence
         number 103 will not be assembled correctly.

1401-AU-037, Version 3, Modification Level 7               Page 2



     6.  CALL or INCLD in col. 16-19 and 16-20, respectively, of
         a comments card (* in col. 6) will cause errors in assembly
         if these comments cards are macro model statements.

     7.  * in the B operand of modify address instructions will not be
         assembled correctly if the modify address macro must be
         used.

Also note that the arithmetic overflow latch is turned on during the execution
of the clear storage cards, and is not reset before the start of program
execution.

Enclosed is a copy of the new Operating Procedures bulletin, form C24-3104-0
and flow charts which will replace the existing library write-up with the
exception of the previous modification letters.

Continued reporting of any difficulties encountered in using 1401 Autocoder
will be appreciated.






                                       GP Applied Programming
                                       
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