Doppler wrote:

How to properly edit CONFIG.SYS and which memory extender to use to get past 105KB?

Why don't you show us what you have so far? The output of "mem /c" would also be useful.

I should add that there are computer viruses which have been known to consume upper memory. You might want to test your configuration in a clean install in PCem or VMware.

Also might want to give QEMM a whirl...

i wrote a bit about DOS memory management on reddit once; chkdsk out https://www.reddit.com/r/retrobattlestations/ … ory_management/

Jorpho wrote:

Doppler wrote:

How to properly edit CONFIG.SYS and which memory extender to use to get past 105KB?

Why don't you show us what you have so far? The output of "mem /c" would also be useful.

I should add that there are computer viruses which have been known to consume upper memory. You might want to test your configuration in a clean install in PCem or VMware.

Its not a virus on 100%. I got a 1:1 not modified windows 98 install disc, and files from verified sources (md5 and virus checked).

Will try QEMM. Any suggestions which parameters should I use?

Some information on how much physical memory you have installed, and what kind of modules, would also help.

Does it show up properly at boot?

How much UMBs you expect, would like to have, or need?

Just quick calculations:
From the first megabyte available in real mode, you get 640kb of RAM and 384kb for other purposes.
In that 384kb area some is reserved for expansion cards and system roms, so quickly calculated 128kb for video ram (to be compatible with everything regarding VGA, monochrome and hercules etc),
32kb for video rom, and 64kb for BIOS rom.
That alone leaves you with 160kb of UMB area. If you want EMS memory (like with EMM386), 64kb goes to page frame, leaving you with 96kb for UMB.

Some video BIOSes are larger than 32kB, and also network cards may have expansion ROM for booting or older network cards may be memory mapped anyway.
So what do you have in the system?

So I take it when you say 105kB, does it include the EMM386 page frame or not?

I have:

1. Integrated UDMA/66 controler which I cant turn off in bios 😜
2. Intergrated USB turned ON in BIOS
3. GeForce 4200 AGP
4. Yamaha OPL-3SAx

and everything else DISBALED in BIOS. Also no EMM386 loaded.

Are there any messages about UMBPCI when it is started?

What about when using "EMM386.EXE RAM" in config.sys and make it print extra info when it starts (by putting VERBOSE as parameter or pressing ALT when DOS is loading)?

Sure, extra RAID/IDE controllers with their BIOSes will take away UMB, as well as support for USB keyboards as they need to be emulated as standard keyboards.

For QEMM I usually just run optimize and it does its magic.