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- readme.txt for EMM386/HIMEM
-
- ***********************************************************
- *THIS IS FREE SOFTWARE WITH ABSOLUTELY NO WARRANTY *
- *WHATSOEVER, WHICH YOU MAY USE COMPLETELY AT YOUR OWN RISK*
- * *
- *IF IT WORKS FOR YOU - FINE. *
- * *
- *IF IT DOESN'T - STOP USING, BUT DON'T COMPLAIN. *
- * *
- *IF YOU SEND BUG REPORT'S, SEND DETAILS *
- *I WONT'T EVEN LOOK AT BUG REPORTS LIKE *
- * 'your EMM386 makes problems. can you help?' *
- * *
- * FIXES WELCOME *
- ***********************************************************
-
- EMM386/HIMEM is released under the GNU GENERAL PUBLIC LICENSE,
- see the file DOCS\LICENSE.TXT for the full text.
-
- In addition, the original authors copyrights must remain intact;
-
-
- ********************************************************************
- ****** this release requires FreeDOS kernel version >= ke2026 ******
- ********************************************************************
-
-
- What it shall do:
-
- HIMEM.EXE replaces MSDOS HIMEM.SYS,
- EMM386.EXE replaces MSDOS EMM386.EXE
-
-
- **************** Why use EMM386 ****************
-
- if you need Upper memory and your PC is not recognized by
- UMBPCI
-
- if you want enhanced (EMS) memory
-
- **************** Why NOT use EMM386 ***************
-
- if you want to run protected mode (VCPI/DPMI) programs,
- you can't run EMM386. to be done - much later.
-
- Programs doing a LOT of IN/OUT may run slower in a protected
- mode environment like EMM386
-
-
- ****** How to use it *******************************
-
-
-
- change CONFIG.SYS like
-
- files=20
- buffers=30
- lastdrive=z
- break=off
-
- >>> dos=high,umb
- >>> device=HIMEM.EXE
- >>> device=EMM386.exe NOEMS
- >>> shellHIGH=c:\command.com /p /e:512
-
- both HIMEM and EMM386 require PC's >= 80386 to run.
-
-
- *******************************************************
-
-
-
- COMMANDLINE switches implemented
-
- use EMM386.EXE from commandline - it will tell you:
-
- NOEMS - disable EMS completely (default=enable)
- VDS - enable VDS current status is experimental
- FRAME=D000 - select wanted pageframe(default=highest possible)
- EMM=20000 - 20000 KB EMS memory wanted(default=8MB)
- X=D000-D800 - no make memory mapped devices work
-
- I=A000-AFFF - IF YOU REALLY KNOW WHAT YOU DO (VGA graphics)
- I=B000-B7FF - IF YOU REALLY KNOW WHAT YOU DO (Hercules)
- I=BC00-BFFF - IF YOU REALLY KNOW WHAT YOU DO (VGA upper text)
- see WARNING below
-
- /VERBOSE - give some more details about found devices,
- mapped UMB's,...l
-
-
- EMM386 allocates fixed amount of whatsneeded (from HIMEM.EXE)
- needed internally ca. 96 KB for pagetables, high code,...
- 64K for DMA handling ( no idea if that works though)
- additionally enough memory to map UMB's (16..160KB)
-
- + tries to allocate the wanted EMS memory (default=8MB)
- more to be used as EMS memory
-
- WARNING:
- in theory, its possible to use upper memory at
- A000..AFFF (VGA graphics) and
- B000..B7FF (hercules adapter)
-
-
- however some programs (or the BIOS INT 10 functions)
- seem to write _sometimes_ into this area,
- so operating with this memory area
-
- IS HIGHLY DISRECOMMENDED to use A000-B7FF
-
- use it at your own risk only
-
-
- ********************* known BUGS ***************
- EMM386 seems to run stable.
- VDS support is only experimental
-
- no VCPI/DPMS/DOS32 functionality
- none at all - not even thought about that
-
- ********************* troubleshooting ***************
-
-
- if you have problems
- add /VERBOSE to EMM386 commandline, will give some details
- about XMS memory, UMB memory, blocks mapped,...
-
- make sure you have kernel >=2026
-
- 1'st) start with following CONFIG.SYS
- !files=20
- !anydos=1
- !break=off
- !buffers=30
- !screen=0x12
- !lastdrive=z
- !stacks=0,0
- !dos=high,umb
- !shellhigh=a:\command.com /P /E:512 /MSG
-
-
- DEVICE=\freedos\himem.exe
- DEVICE=\freedos\emm386.exe NOEMS /VERBOSE
-
- rem - if you want CD:
- rem DEVICE=\freedos\CDROM.SYS /D:MSCD000
-
- 2'nd) add one driver after the other, until you find
- the one, that causes trouble.
- try to load it high (deviceHIGH=),
- then to load low (device=),
- then try to load BEFORE EMM386.
- please report any *positive* results, so I can
- add them here.
-
- 3'rd) you are out of luck. sorry.
-
-
- ********************* known incompatibilities ***************
-
- FDXMS08
- uses priviledged instructions and is not supported
-
- FDXMS09
- has a bug and is not supported
- please use HIMEM.EXE, which is 400 byte smaller as well.
-
- ***********************************************************
-
-
-
- tom ehlert (tom.ehlert@ginko.de) 2002-04-03
-
-