Re: A20 Address line - XMS issue

["S.Gopi" <sekargopi@yahoo.com>]

--- Bart Oldeman <oldeman@math.ohio-state.edu> wrote:
> 
> HIMEM.SYS services are *provided* by DOSEMU.
> HIMEM.SYS might be able to
> run in DOSEMU if DOSEMU would implement int
> 0x15/0x87 to copy extended
> memory though. However it's a fairly pointless
> exercise unless you really
> need some very special use.

it looks fine, if dosemu can emulated these interrupt
calls and do memory paging in the protected mode
itself with given virtual memory(something like what
is being done in the XMS now) it would make it
possible to use HIMEM.sys
> 
> 
> a) dosemu does not implement int15/0x87
> b) dosemu emulates A20 through these calls
>    1. XMS driver calls ah=3/4/5/6/7.
>    2. the relevant I/O port (keyboard related).
>    using a paging technique. The XMS driver API (in
> real DOS this
>    API is provided by HIMEM or FreeDOS FDXMS) has
> been in DOSEMU
>    for ages. The port technique became necessary
> when we found out that
>    Windows ME DOS bootdisks use that.
> 
> 
> himem.sys might run, but VCPI support is out of the
> question without CPU
> emulation; VCPI needs ring-0 access.
fine, what is the effort that needs to be put on this,
I mean is that possible to do it with current dosemu
distribution itself with little bit of code hack. I
would like to do it since this is very much important
for the project i am involved in.
gopi


__________________________________________________
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
http://mailplus.yahoo.com