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- Notes on Windows 3.0 and High Memory
- ************************************
-
- As you may have discovered, the standard and 386 enhanced modes of
- Windows 3.0 are incompatible with 386 control programs like QEMM
- and 386-to-the-Max, and like Windows/386 2.1 before it, the latest
- release of Windows provides no "high memory" features. While this
- absence makes little difference to Windows applications, it does
- affect the maximum size of any DOS windows opened under the 386
- enhanced mode of Windows 3.0.
-
- On many 386 machines, however, it is possible to endow a Windows 3.0
- environment with high memory by loading either Quarterdeck's QRAM or
- Quantilas' Move'em AFTER Microsoft's HIMEM driver. Designed as memory
- enhancement products for 286 machines, these control programs do not
- attempt to access protected mode in any manner that conflicts with
- either Windows 3.0 (or Windows/386 2.1 for that matter). The
- conventional memory one saves by loading device drivers and TSRs into
- high memory, while insignificant as far as Windows is concerned,
- can be of critical significance when attempting to run standard DOS
- applications in Windows 3.0's enhanced 386 mode.
-
- The following are the contents of typical config and autoexec files,
- with and without the high memory produced by Move'em (the syntax is
- somewhat different for QRAM, but the results are similiar):
-
- Without high memory
- *******************
-
- STACKS=0,0
- FILES=30
- BUFFERS=3
- DEVICE=C:\HIMEM.SYS
- DEVICE=C:\WINDOWS\SMARTDRV.SYS 2048 512
- DEVICE=C:\WINDOWS\RAMDRIVE.SYS 1024 /E
- DEVICE=C:\DOS\ANSI.SYS
- DEVICE=C:\DOS\MOUSE.SYS
- INSTALL=C:\DOS\SHARE.EXE
- SHELL=C:\COMMAND.COM /P /E:256
-
- CLS
- SET TEMP=E:\
- PATH C:\;C:\DOS;C:\WINDOWS
- PROMPT $P$
- C:\DOS\DOSKEY.COM
- C:\DOS\MODE.EXE LPT1:,,P
- C:\DOS\MODE.EXE COM1: 9600,N,8,1
- C:\DOS\MODE.EXE COM2: 9600,N,8,1
- CLS
-
-
- With high memory
- ****************
-
- STACKS=0,0
- FILES=30
- BUFFERS=3
- DEVICE=C:\HIMEM.SYS
- DEVICE=C:\MOVE'EM.MGR EXCLUDE=E000-EFFF
- DEVICE=C:\DOS\MOVE'EM.SYS PROG=C:\WINDOWS\SMARTDRV.SYS 2048 512
- DEVICE=C:\DOS\MOVE'EM.SYS PROG=C:\WINDOWS\RAMDRIVE.SYS 1024 /E
- DEVICE=C:\DOS\MOVE'EM.SYS PROG=C:\DOS\ANSI.SYS
- DEVICE=C:\DOS\MOVE'EM.SYS PROG=C:\DOS\MOUSE.SYS
- SHELL=C:\COMMAND.COM /P /E:256
-
- CLS
- SET TEMP=E:\
- PATH C:\;C:\DOS;C:\WINDOWS
- PROMPT $P$
- C:\DOS\MOVE'EM.COM PROG=C:\DOS\MODE.EXE LPT1:,,P
- C:\DOS\MOVE'EM.COM PROG=C:\DOS\DOSKEY.COM
- C:\DOS\MOVE'EM.COM PROG=C:\DOS\SHARE.EXE
- C:\DOS\MODE.EXE COM1: 9600,N,8,1
- C:\DOS\MODE.EXE COM2: 9600,N,8,1
- CLS
-
- (The 64K area from E000 to EFFF excluded on the Move'em load statement
- above leaves a page frame for Windows 3.0's own internal EMM manager,
- and a pointer to that area can be added to the system.ini file.)
-
- In this example, on a 386 with 4 MB of memory and a VGA1024 card,
- running under DOS 4.01, Move'em produces 96Kb of non-conflictual high
- memory, where some 40Kb worth of device drivers and TSRs are loaded,
- thus relieving the drain on conventional memory by just that much.
- Without any high memory, the maximum executable program size under
- DOS is 535Kb, while in a DOS window under Windows 3.0, you are left
- with 522Kb; the same setup with high memory, leaves a maximum
- executable program size of 579Kb under DOS, and 558Kb for a DOS
- window under Windows 3.0. The 36Kb saved can make all the difference
- between running an application inside Windows 3.0, and having to
- exit the environment altogether.
-
- Note that when loaded in high memory some device drivers and TSRs
- conflict with the environment Windows 3.0 attempts to create (the
- files.com utility packaged with QRAM, for example), so a trial-and-
- error approach is necessary. But even if the only device driver or
- TSR you find you can load in high memory is Smartdriv, you'll
- still have relieved your conventional memory drain by 20Kb.
-
- Ashley Saldanha
- 72677,2370