VirtualBox does support Fast A20, if that helps.
I know because I use that technique in the Night kernel :)
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-------- Original Message --------
On Jul 29, 2018, 3:03 PM, Eric Auer wrote:
> Hi!
>
> 256 MB should be plenty, but I do not know
> what the default configuration is. HIMEMX is
> supposed to be okay, but you can try other
> provided boot options with other drivers.
>
> Also note that it might matter which style
> of A20 gate your virtual machine offers,
> as misunderstandings about that can cause
> confusing for HIMEM and EMM386 drivers.
>
> Such problems can then show up as trouble
> when using XMS, HMA or UMB. FreeDOS uses
> all of those relatively early during boot
> when they are enabled, but of course you
> can change the configuration in many ways
> such as not putting DOS=HIGH,UMB lines.
>
> Regards, Eric
>
>> Virtual machine has 256 MB of RAM. I tried giving it 512 MB...> ... it
>> appears to be using A:\FDSetup\BIN\HIMEMX.EXE as
>> DEVICE in FDCONFIG.SYS. ...
>
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