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READ.ME
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1988-06-07
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Contents of this Package
------------------------
read.me This file: contents, deSCRNCHing info, etc.
scrdoc.com Documentation, SCRNCHed
scrnch.com SCRNCH program
scre2b.com Convert .EXE to .COM
scrb2e.com Convert .COM to .EXE
testr.bat For testing Run Mode exit .TXT files
testw.bat For testing Write Mode exit .TXT files
compress.bat SCRNCH an .EXE or .COM program in Run Mode
scrxr.stb Program portion of Run Mode sample exit
scrxw.stb Program portion of Write Mode sample exit
scrxr.txt Text portion of Run Mode sample exit
scrxw.txt Text portion of Write Mode sample exit
scrxr.bin Run Mode sample exit
scrxw.bin Write Mode sample exit
prtparm.com A sample program to be SCRNCHed
What to do first
----------------
At the DOS prompt, type SCRDOC. You will see instructions
telling you how to create the documentation file.
Introduction to SCRNCH
----------------------
SCRNCH is a data compressor designed for people, such as software
developers, who need to send programs or files to a large number
of people cheaply. It provides a high degree of compression and
the ability to customize the self-extracting compressed file.
SCRNCH takes its time to produce optimal compression, but
decompression is automatic and very fast. Graeme W. McRae is a
Member of the Association of Shareware Professionals.
Keywords: SCRNCH DATA COMPRESSOR COMPACT SCRUNCH COMPRESSION
COMPRESS SELF EXTRACTING SELF BOOTING
Common Difficulties
-------------------
If you're SCRNCHing a large file, be sure to use the .EXE extension
on the output file. The .COM extension will be accepted, but the
resulting .COM file will be too large for DOS to execute.
Example: scrnch /e manual.doc mandoc.exe
If you're SCRNCHing a data file (that is, in Write Mode) you
almost certainly want to use the /e option. When in doubt,
try it, and you'll see what it does for you!
If the file you SCRNCHed was a binary file, then it might contain
the Ctrl-Z character. If the user tries to deSCRNCH the file to a
character device, such as standard output, he might see an
erroneous "Disk Full" message. To avoid this, include
instructions for the user explaining how not to deSCRNCH binary
files to the terminal or to the printer. On the other hand, if
the file you SCRNCHed was a text file, then it is perfectly OK
for the file to end with Ctrl-Z, and the user will not see any
error message.
Troubleshooting
---------------
If you don't get the expected result, perhaps there is an error.
Look for the following error messages:
Program too big to fit in memory.
If the program is a .COM file and it is larger than 64K, you
should rerun SCRNCH, specifying the .EXE extension on the
output file. If the program you're trying to run already
contains the .EXE extension, this message can mean there is
an error in the .EXE header. Large .EXE files don't work
properly under the IBM Workstation Program; try rebooting
without it. Or perhaps the program really is too big to fit
in memory.
Out of memory.
This means you must remove some resident software from
memory. Try rebooting, perhaps from the DOS distribution
diskette, and then try deSCRNCHing again. You need at least
140K available to run SCRDOC.
Bad copy.
This means your copy of SCRDOC.COM has an error in it. You
should obtain a new copy.
Error writing.
Perhaps there is a problem with the disk drive or media
you're writing to. Narrow down the problem by using other
programs (e.g. the DOS COPY command) to attempt to write to
the same disk.
Disk full.
You'll have to clear away some space, and then try
deSCRNCHing again. If you're using a floppy disk, be sure
it is formatted properly.
If you're deSCRNCHing to the console or to the printer,
this message may be erroneously issued. You may ignore it.
History
-------
01/31/88 SCRNCH Version 1.00 released.
02/12/88 Version 1.01 fixed a but that prevented SCRNCHing files
larger than 1 meg.
02/21/88 Fixed misleading documentation regarding .EXE output files.
03/03/88 Fixed erroneous "bad copy" message in >64K Run Mode
03/03/88 Improved deSCRNCHing performance (size increased slightly)
03/26/88 Write Mode now requires no more than 140K to deSCRNCH
03/28/88 SCRE2B and SCRB2E added to package, Version 1.02 distributed.
04/04/88 Fixed bug where COMPRESS.BAT deleted .EXE output