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Is there a DOS memory documentation available? (Users)

posted by bretjohn Homepage E-mail, Rio Rancho, NM, 08.01.2024, 18:17

> Hi,
> I come closer and closer to final version 1.1.0 of FreeDOS help, see:
>
> https://www.bootablecd.de/FreeDOS-Internet-version/help110/en/index.htm
> (if you find a mistake there, please inform me.)
>
> What I am still missing is a short and simple to understand explanation of
> the different DOS memory types, how it came to this and how to handle them
> (different config/autoexec configurations etc.).
> Does anybody know such a free documentation that I can overtake for FD
> help?
The descriptions given below by others are accurate, but I'm not sure are all that helpful to you for writing FreeDOS help. The descriptions sort of provide reasons as to why a PROGRAMMER might decide to use a particular type or combination of types of memory. What types of memory you may actually need to configure in FreeDOS at boot time depends on what programs you are going to run and what kind(s) of memory they use. No matter what you put in the help file, it will not be 100% accurate or complete. I applaud the effort, though.

I will also say that the descriptions provided below do not really address the memory requirements of TSRs and device drivers, which are VERY different than "regular" programs. E.g., "regular" programs almost never use Upper or High Memory, and TSRs and device drivers almost never use DPMI. In addition, DPMI can be incompatible with certain kinds of TSRs (see the thread:

http://www.bttr-software.de/forum/forum_entry.php?id=20131&page=0&category=0&order=last_answer

which talks about problems between DPMI and SBEMU).

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