Re: DosEMU, Ghost: VGA screen garbled...

[Alain Mouette <alainm@pobox.com>]

Would it be possible to run dosemu over a simple system like framebuffer?

I am interested in making a simple linux, with something like BusyBox, 
only to run dos programs...

Alain

Bart Oldeman escreveu:
> On Thu, Sep 17, 2009 at 5:06 AM, Frantisek Rysanek
> <Frantisek.Rysanek@post.cz> wrote:
>> I thought I didn't need "-s" if I was logged in as root (because I
>> noticed that that way, DOSEMU asks for /usr/bin/sudo). This is not
>> entirely true, there's more to "-s" than just the sudo. It
>> effectively tells DOSEMU "don't be shy, feel free to do all the stuff
>> that you need the root privileges for".
> 
> exactly. It's just a way to avoid running "dosemu" as root and
> accidentally crashing the system because direct hardware access
> doesn't work.
> 
> By the way, it looks like with KMS (kernel modesetting) direct console
> graphics can't work: VGA text mode is entirely unsupported then. I
> will see about adding a check for that.
> 
>> -V looks like a "video mode sanitizer", can't say if it has any
>> effect in my case or not...
> 
> -V just does the same thing as setting "$_graphics=(1)", i.e. the
> switch has no effect if $_graphics is already set that way.
> 
>> -d = "detach". I can see that the dosemu command returns to the shell
>> immediately, but only after it has "forked a demon", that in turn
>> attaches to the first free virtual console. It also switches you
>> straight to the newly picked console that dosemu has attached to, so
>> you don't quite notice, until you try switching consoles using
>> CTRL+ALT+Fx :-)
> 
> Yes, it works like X that way.
> 
> Thanks for your patch for wholedisk. I adjusted it a bit also after
> reading a bit of Linux fdisk source code: just unconditionally ignore
> the cylinder value from HDIO_GETGEO and compute it instead. In fact
> HDIO_GETGEO gives bogus info so I changed it to look at the MBR as
> well to determine CHS limits. It's now in SVN.
> 
> Bart
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