Re: [Freedos-user] Getting Master Of Magic to work on Free DOS 1.2 in VirtualBox 5.2.0

[Eric A. <e....@jp...>]

Hi Vladimir,

> I installed boom (doom clone) via fdimples command, and it works.
> 
> I try to launch Master Of Magic and I get the message: "You must have at
> least 2700k of expanded memory." ...

> Extended (XMS)     31,680K       472K    31,208K
> Total Expanded (EMS)                   31M (32,686,080 bytes)
> Free Expanded (EMS)                    31M (31,981,568 bytes)

Some old games have problems if there is too much memory.
Try to limit memory to 15 MB for example, using options
for HIMEM and/or JEMM386. Also, check if your game needs
EMS 3.x (not 4.0) style page frames, a 64 kB area above
640k, to work and check with MEM whether you have such
a page frame in your UMB area. As your PC is a virtualbox
anyway, you can try to simply limit the total amount of
memory in the whole virtualbox, so you avoid having to
use any config.sys driver options while still restricting
DOS to only 15-16 MB of RAM which the game might prefer.

Potentially interesting JEMM386 options for you are
MAXEXT=... X2MAX=... NOE801 NOE820 according to the
jemm386.txt file. Possibilities differ if you use
JEMMEX (himem and emm386 in one) versus one HIMEM
style driver (alternatives include FDXMS) and one
EMM386 driver (such as JEMM386) separately. FDXMS
for example has the additional INT15=... option.

Just like in the "good old days" there are many knobs
to tweak for DOS memory configuration and some games
are harder to make happy than others. I hope others on
this list can add some other useful suggestions! :-)

In particular ideas from virtualbox users would help.

Regards, Eric