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* * * * *   PROGRAMMER'S JOURNAL--Volume 9.3 CODE DISK   * * * * *
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The source code files on this disk are from Programmer's Journal,
Volume 9.3, May/June 1991. These files are identical to those 
published in the magazine, except where noted; OBJ and EXE files
have been added. 

The copyrights are held by the programs'authors, as indicated in the 
files. All other rights are reserved by Oakley Publishing Company, 
1991. No one may commercially distribute these files. Every effort 
has been made to assure that the program files are correct and 
complete. No guarantee, express or implied, is offered as to the 
correctness of the files, nor to the fitness of the programs for 
any purpose whatsoever.


Files from Volume 9.3 are as follows:
                     
Code from "Pixel Panning" by Peder Jungck

Ever wondered how arcade games simulate motion and generate 
such smooth action images? Wonder no more. Peder explains how similar 
feats are possible on the EGA and VGA using fast panning to window 
onto a "larger than life" screen.
     
    PIXELPAN.ASM   Assembly language routines for pixel panning 
                   designed for C-style calling conventions 
    PANTEST.C      Testing code that displays color blocks and then pans
                   the display
    PANTEST.EXE    An executable version 
    PANTEST2.EXE   An executable version with macro SLOW_EGA set to 1

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Code from "Object-Oriented SCSI Programming" by Brett Glass

Although other PC hardware interfaces have long been standardized, 
SCSI programming has remained a free-for-all. Brett looks at the latest 
proposed Common Access Method (CAM) standard for SCSI and writes some 
portable code to interface with SCSI devices using Turbo Pascal objects.

    CAM.PAS        A Turbo Pascal unit that implements an object-oriented
                   interface to BallardSynergy's CAM SCSI drivers
    CAMTEST.PAS    A simple test program to see what SCSI devices are attached

                     
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Code from "Numeric Exception Handling" by Mark J. Barrenechea

Floating-point errors have puzzled programmers for too long. 
Mark demystifies the IEEE 754 and 854 floating-point standards and 
explains how the Intel 80287/80387 and i860 chips fit into the puzzle. 
Learn some slick techniques for handling numeric exceptions in C++ 
with ease and elegance.

    EXCEPT.CPP     A simple program illustrating numeric exception 
                   handling in C++
    EXCEPT.EXE     An executable version using Zortech C++ 

                     
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Code from "Virtual Realities" by Stephen M. Kuhn  

When your text-based application can no longer deal with 
the memory-hungry real world, it's time to go virtual. Stephen shows 
you how to select and develop an application-supported virtual memory 
system that can take advantage of EMS paging and disk storage. 

    VMHEADER.H     Some useful structures for a VM application     
    TOKEN.C        Some sample code illustrating the use of VM calls


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Code from "Basic Libraries" by Murray L. Lesser

Our BASIC ace shows how to manage personal link libraries. Along the
way, he provides two utilities that streamline library management and
explains how to shrink applications by linking stub modules.

    COMMAND.ASM    Subroutine to insert "rest of command line" in PSP
                   for Microsoft BASIC Compiler v7.0
    COMMAND.OBJ    An object code module for your library
    DOLIB.BAS      A BASIC program to update private libraries
    DOLIB.EXE      An executable version
    FINDFILE.BAS   Two BASIC functions to find files in a directory
                   and strip out the filename and extension from the
                   full subdirectory and filename string 
    FINDFILE.OBJ   An object code module for your library
    PBBI.BAS       A BASIC program to update the declaration header file
                   for BASIC library maintenance
    PBBI.EXE       An executable version
       

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Code from "Hashing Functions" by John Otken

John examines string hashing functions for fast table lookup 
and explains why a hash table, unlike your car's gas tank, should 
never be full. He also creates equivalent functions in assembly language 
for Windows 3 routines that manage handle-based dynamic storage and 
atoms (hashed strings).

    ASM.INC        A revised include file with macros
    ATOM.ASM       Atom functions
    DOS_ERRS.ASM   MS-DOS interface that sets error string
    FATAL.ASM      Fatal error routine
    GLOBAL.ASM     Global storage routines
    MALLOC.ASM     Memory allocation and free routines
    MISC.ASM       Miscellaneous support routines
    PERROR.ASM     Routine to print error messages
    PUTCHAR.ASM    Output a single character routine
    PUTS.ASM       Output a string routine
    STARTUP2.ASM   Start up code for assembly language
    STREAM.ASM     Stream I/O routines
    STRERROR.ASM   Error message interface routines
    STRNCPY.ASM    String copy routine
    TESTATOM.ASM   Program to test the atom routines
    TESTATOM.EXE   An executable version of the TESTATOM program
    TESTATOM.MAK   A make file to create the TESTATOM program

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