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Notes on Adventure Environment
written April 26, 1981

        This disk was written and and compiled under version 1.3x and
will NOT compile under version 1.4 and later without changes to the
source.  Specifically dbuff in advent.h on or about line 134 must be
declared so that it is compatible with the 1.4 file i/o.  The com files
on the disk will require at least a 46k system to execute, but
recompiling under 1.4 will add about 1k to the memory requirements
(except that 1.4 produces tighter code).
        The com files provided were debugged on a system including
a 48k Altair equipped with 2 Micropolis drives, and a Processor
Technology VDM.
        To begin play, type advent. To resume a saved game type
"advent -r".

Added notes on making this ADVENTURE work in BDS-C Version 1.43
Environment  written 17 May 1981 by L. C. Calhoun.

        At Robert Ward's request, I brought this program up on
the 1.43 compiler.  Only one change was required..to add the
small section on buffering from BDSCIO.H to ADVENT.H, and to
change dbuff[134] in ADVENT.H to dbuff[BUFSIZ].  I did review
the other program files for potential changes, and added a
title and note to the head of each for the record.  The compile
and link control syntaxes differ between V 1.4 and older versions.
I made the appropriate changes, and created two submit files;
ADVCOMP.SUB and ADVLINK.SUB.  These must (of course) run on
disk a:, but they are set up for all the c utilities to be on
disk a: and the actual c programs with their .CRL files to be
on b:.  Just PIP these two sub files over to the a: disk where
CC1, CC2, C.CCC, CLINK, DEFF*  etc. hang out.  Only one file
needs to be read two times during linkage - TURN.CRL while
EADVENT.COM is being linked.  Otherwise, it went smoothly
in conversion.

        Mr. Jaeger (me too, I must admit) was worried that
the greater buffer size used in the standard V 1.43 library
would have a bad effect on the program length.  I compiled
without the -o option for optimization.  Lo and behold,
the program appears to be considerably shorter.  I was able
to external set the data (-e6A00) much lower than in the
submit files supplied.  I could have even gone lower.
I compiled a second time with the e option in CC1 to -e6A00,
see ADVCOMP.SUB.  Dog gone if the code didn't end at 5EC8.
However, the variables end at 7CA1 even with the -e6A00,
so I didn't bother.

        The re-compiles were done on an ALTAIR 8800B, with
a 60K CPM 2.2 system, ADM-3A display, and TARBEL single side
single density controlling four Shugart 801R's.  I checked
the elboeroom callouts during compile, and the least amount
of elboeroom was 20K whilst compiling TURN.C.  So, it appears
that the re-compiled version will compile and run on
a 40K system with about 4K of stack space.  You can pick
up another 2K of stack space by editing the ADVCOMP.SUB file
for the option -e6000 if it's worthwhile.  Thank you Mr. Zolman.

***********************************************************************

Written on Sept 18, 1985

Port of source code to the MS-DOS environment with the following
target compilers:

                  Eco-C88          Version 2.72
                  Lattice C        Version 2.14
                  DeSmet C         Version 2.41

Most of the changes required involved the use of file I/O and the
database offset index arrays used in the program.  Conditional code
was added at various points in order to allow the same source to
compile under the three target compilers.  The modules EADVENT.C and
SAVEADV.C were modified from main drivers to called functions in order
that the entire program could be linked into a single executable
module.

Under MS-DOS version 2 or higher the default number of files is one
too few to enable the program to run.  A FILES=10 should be added
in your CONFIG.SYS file (I've been using 12).

I was unable to get the Lattice version to operate properly using
buffered file I/O.  It appeared that the file offsets returned by
lseek() and ftell() were incorrect while using buffered I/O.  I'm
still scratching my head over this one.  I disabled file buffering
on the Lattice version and it worked perfectly.  Well .... not
exactly perfectly.  Lets put it this way, it operates properly.  A
dead snail could beat it in a race but it does operate as advertised.
If anyone has a clue for a fix to this it would be most appreciated.

All versions of the program were compiled on an IBM/PC with 640K and
running under PC-DOS V2.10.  The executable modules were also tried
under PC-DOS V3.00 and on a TIPC with 512K running under MS-DOS V2.13.
The program operated as expected under all configurations.

Bob Withers

*****************************************************************************

Written on June 2nd, 1990

The code was once again ported to compile under Microsoft C V5.10 and V6.00
under both MSDOS and OS/2.  Numerous changes and code restructuring were
performed.  See comments in file ADVENT.C for details.

Bob Withers
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