Is this before the 1st intersegment call, when the i386 forces the upper address lines to 1's? I'm getting close to having it all figured out... I have lots of 2-3" thick books opened around me.
----- Original Message ----- From: "Ronald G Minnich" <[EMAIL PROTECTED]> To: "Jeremy Jackson" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Wednesday, March 27, 2002 9:01 PM Subject: Re: important changes .... > On Wed, 27 Mar 2002, Jeremy Jackson wrote: > > > It might be nice to be able to use this for memory, if you > > don't have an ISA VGA. It's true that even many embedded > > systems have lots of memory to burn, but it would be nice > > and clean. Perhaps even 0xa0000-0xbffff could be reclaimed > > in some scenerios (as useable memory) > > there's a tricky timing issue here, esp. for DoC. > > For docipl, in real mode, 0xf0000-0xfffff MUST NOT BE RAM. Once we shift > to protected mode then we can kill the memory hole -- but only on some > systems. > > I need to work up the sequence for reference for people. > > ron >
