On 5/10/25 14:20, Eric Auer via Freedos-devel wrote:
Hi!
https://www.vogons.org/viewtopic.php?t=83477
https://www.vogons.org/download/file.php?id=118934
i have question! how do i get this to work on FreeDOS?
That seems to be a tool to enable UMB in some areas.
For which hardware and for which DOS is that tool?
PC/XT/AT
and 5.0+
The problem with UMB is that it depends on your
(real or simulated) hardware whether there is
memory at all at a certain UMB area and whether
it already is reserved for something. For example
you usually need a000:0000 to a000:ffff for VGA
and b800:0 to b800:7fff for text, but you might
be able to use b000:0 to b000:7fff for UMB if
you never use mono text or 128 kB graphics, so
you could enable UMB at b000-b7ff in that case.
Other areas may be used for BIOS, for example.
A widespread way to get UMB is to load EMM386 or
similar drivers which can even put memory from
above 1 MB in the UMB areas to make sure that
you have memory there. But you still have to
avoid areas which conflict with other things.
A well-known driver to enable hardware memory in
some UMB areas on different mainboard chipsets
without EMM386 is UMBPCI:
https://www.uwe-sieber.de/umbpci_e.html
Still, UMB often are a thing of trial and error.
If you get crashes, try different options. Most
drivers have command line options to configure,
so you do not need to modify source codes :-)
true :D
I definitely know this! <3
this use!umb program is special
it works on 16bit pc compatibles!
Regards, Eric
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