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- ------------------------------------------------------------------------------
- ------------------ Frequently Asked Questions About PMODE/W ------------------
- ------------------------------------------------------------------------------
- ----------------------------- Updated 11/18/96 -------------------------------
- ------------------------------------------------------------------------------
-
- Q: Where can I find the latest version of PMODE/W?
-
- A: The best way to get the latest version is via the Internet. We always place
- the newest PMODE/W on the following sites. The sites toward the top are
- most likely to have it first:
-
- ftp://ftp.cdrom.com/pub/demos/incoming/code
- (later moved to /pub/demos/code/pmode)
- ftp://x2ftp.oulu.fi/pub/msdos/programming/watcom
-
- You can get the latest release (as well as other information) via WWW at:
-
- http://www.di.net/pmw
- http://www.dorsai.org/~daredevi/pmw
-
- In addition, you may contact the authors directly by sending email to
- daredevi@dorsai.org.
-
-
- Q: How do I get rid of the startup message? How come it was never there before?
-
- A: You can disable the startup message using PMWSETUP. The startup message
- was just added in v1.23 at the request of many PMODE/W users. We did not
- feel a need to display anything at startup, but since so many have asked
- for it, we decided to add it in this version.
-
-
- Q: Is PMODE/W 100% compatible with DOS/4GW?
-
- A: PMODE/W is compatible with nearly all Watcom C/C++ functions. However,
- PMODE/W does not support all of the extensions and API functions which
- DOS/4GW does. DOS/4GW does a number of things that we feel are quite
- unnecessary for most applications and most likely you will never miss them
- (especially since they waste a lot of your precious memory and disk space).
- Why extend something, wasting system resources, when you may not even be
- using it in your program? So remember: before blaming a problem with your
- program on PMODE/W, make sure that what you are doing is indeed supported
- by our system. Read PMODEW.DOC for more information.
-
- NOTE: PMODE/W is NOT a clone of DOS/4GW! There are many differences in the
- way PMODE/W operates. Please keep this in mind when reporting bugs.
-
-
- Q: Why doesn't my PMODE/W program work with DOS/4GW?
-
- A: You can not run a compressed PMODE/W program with DOS/4GW. The program may
- be using a DPMI function which PMODE/W supports but DOS/4GW does not. You
- may also be using 16 bit code directly instead of allocating DOS memory,
- copying the code, and using it. PMODE/W always loads 16 bit real mode code
- into low memory, thus enabling you to use it directly. DOS/4GW loads all
- code into extended memory, where you can not use real mode code.
-
-
- Q: Why doesn't my DOS/4GW program work with PMODE/W?
-
- A: Almost any program that works with DOS/4GW will run correctly with PMODE/W
- as long as it does not use any DOS/4GW specific functions. If a program
- does not work at first, you may have to tweak the PMODE/W system variables
- using PMWSETUP. For example, you may try setting the maximum low memory to
- reserve to 0FFFFh to force PMODE/W to load all 32 bit code and data into
- extended memory like DOS/4GW (16 bit code will still be loaded into low
- memory). You may also try increasing the number and/or nesting of the
- protected and real mode stacks.
-
-
- Q: Can I still debug PMODE/W programs under the Watcom debugger?
-
- A: Yes you can. You can debug your PMODE/W programs in exactly the same manner
- you would debug a DOS/4GW program (using the /TR=RSI switch of course). You
- cannot, however, debug programs which have been compressed using PMWLITE.
- You also cannot debug PMODE/W programs that do not run under DOS/4GW.
-
-
- Q: Why can't I access more than 16 megs of memory under my VCPI server when
- there is more than that available in my system?
-
- A: You must increase the maximum number of VCPI page tables PMODE/W will
- manage using the PMWSETUP program. Each page table you add will give you
- another 4 megs of memory (provided that it is physically available of
- course).
-
-
- Q: Why can't I map more than 4 megs of address space of a physical device
- using DPMI function 0800h?
-
- A: You must increase the maximum number of physical address mapping pages in
- PMODE/W using PMWSETUP.
-
-
- Q: How come PMODE/W takes a little while to load under EMM386?
-
- A: PMODE/W allocates all of its extended memory pool during initialization
- whereas DOS/4GW allocates memory every time you (or the C libraries) call
- the DPMI memory allocation functions. The delay is caused by EMM386's
- slowness in allocating pages. PMODE/W may take a little longer than DOS/4GW
- at startup in this case, but it will be much faster during the execution
- of the program since it does not need to call EMM386 for memory again
- after that. If the delay is a problem, you can adjust the amount of
- extended memory to allocate in PMWSETUP. The less memory there is to
- allocate, the faster loading will be under EMM386. However, keep in mind
- your memory requirements when changing that setting.
-
-
- Q: How come DOS/4GW, Pharlap, or other 32bit DOS applications don't work using
- spawn() under PMODE/W?
-
- A: Some other DOS extenders require extended memory to initialize. Also, the
- program you are trying to run may require extended memory. To remedy this,
- you can change the maximum amount of extended memory for PMODE/W to
- allocate using PMWSETUP. Set the value to something you feel meets the
- requirements of your program instead of the default (which allocates ALL
- memory). This will make sure that your program does not allocate any more
- memory than it needs, therefore leaving whatever memory is left over for
- the program you are trying to execute.
-
-