Re: Question about UMBs

tom ehlert wrote:

>>  I learned this several years ago, but I've never done anything with it 
>>since, so... I'm wondering how a UMB provider informs DOS that there's 
>>now memory about the video buffer at A0000-BFFFF? 
>>
>
>XMS function 0x10 (see RBIL int2f/4310)
>
Ehm... I'm not looking to provide a UMB manager, but just let DOS manage 
them once they're there. I couldn't find the source code to UMBPCI 
anywhere, and since the UMB service it provides looks very attractive to 
me, I downloaded some Intel docs and worked up a program (last night) 
that provides UMBs where possible on a 440LX chipset (I could easily 
modify it to add support for more Intel chipsets, the differences 
between them aren't all that large, but that's the only chipset I have 
available to test with). So, I have (in pure DOS mode on this machine) 
an extra 144KB of memory, but I don't know how to inform DOS about it....

>>is it possible to create a .sys file, loadable by the 
>>DEVICE command in config.sys, that won't take any memory after 
>>initialization? Meaning, it loads, does its job, and is completely out 
>>of memory afterwards.
>>
>
>return installation error and set memory required=0, 
>and you won't get installed.
>
Okay... I'm relearning how to create .sys files, so I think I'll 
understand that in a couple days, lol.