Re: Windows 3.1 Support

[Stas Sergeev <stsp@aknet.ru>]

Hello.

TP Reitzel wrote:
> I acted on your suggestion and installed version 1.4 of the TVGA8900C 
> driver for Windows 3.1. It works in both the 800x600x8 and 1024x768x8 bit 
> modes. 
Actually you can get even more than 8bpp
(which I thought your original question
was - misreaded it). You need to get the
newer trident drivers uc51-win.exe and
you'll be able to get 16bpp by using the
trix800.drv. But you'll need to switch
your X server to 16bpp either because the
dosemu doesn't support 16bpp->32bpp
remapping :(

> HOWEVER, this Trident driver conflicts with Video For Windows 1.1 and I 
> haven't been able to find a newer version of the Trident driver which 
> fixes the problem.
Newer version doesn't help :(
The problem is not in the driver itself
but in the vtdapi.386 that dosemu emulates
by using the code stolen from wine. And
this doesn't work.
I think perhaps dosemu needs the LE loader
so that it could load and use the native
.386 drivers. They may require ring0, but
most of them are likely only need the hardware
access, which is not a problem.
Any ideas where is some LE loader code in C
can be stolen? :)

> When I attempt to change virtual memory settings, I'm getting an 
> error about nonstandard Windows files. Consequently, I can't change 
> virtual memory settings with krnl386.exe.
Virtual memory in windows is handled by
the VxD code which is not in dosemu. And
you don't need it anyway because the
virtual memory is provided by Linux kernel.
Duplicating that functionality under dosemu
is possible (32rtm can do this), but there
is no real use because the Linux kernel
does it more effectively. So if you need
more memory to your Windows app, just increase
the $_dpmi value in dosemu.conf, and Linux
will do the rest.