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                Inter-Office Memorandum

    To          Mesa Users                            Date           October 17, 1977


    From        John Wick                             Location       Palo Alto


    Subject     Mesa 3.0 System Update                Organization   SO~/SO



XEROX
    Filed on:   [MAXC]MESASYSTEM30,BRAVO



    This memo outlines changes made in the Mesa system code since the last release (May 13,
    1977).

    Names in square brackets refer to sections of the Mesa System Documentation which have
    been updated. More details can be found there and in other documentation accompanying
    this release.

    Binding

    Modules (and configurations) are now bound as they are loaded; a separate binding call is no
    longer required.

    BitBlt

    Since all Altos have been converted to microcode version 23, we have removed software
    BitBlt from the system.

    Configuration / nstantiation

    Because the language does not yet support the NEW operation on configurations containing
    more than one module, the system procedure FrameDefs.New must be used. It takes a
    filename (which usually ends with ".bcd.") and returns a GlobalFrameHandle; the result
    should be LOOPHOLEd into a PROGRAM or a POINTER TO FRAME of the appropriate type.

    Definitions

    Because the new binder requires all procedures and signals to appear in definitions files,
    several new modules have been added to the system. Those of interest to users include
    BFSDefs, DirectoryDefs, FrameDefs, MiscDefs, and TrapDefs. [Section 2]

    Disk Streams

    Procedures have been implemented which create byte or word streams directly from file
    names and access options, rather than from FileHandles. A Modifylndex procedure is
    available for adjusting a Streamlndex forward or backward. [Streams]

    Free Storage Package
Mesa 3.0 System Update                                                                      2


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