Messages in this thread | ![/](/images/icornerl.gif) | | From | Paolo Ornati <> | Subject | Re: [OT] Documentation for PC Architecture | Date | Mon, 18 Aug 2003 23:11:53 +0200 |
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> > > Curiosity: since the memory addresses from 640KB to 1MB are reserved for > > memory mapped I/O (video memory) and BIOS ROM... the corrispondent range > > in > > uh oh ... > > > the REAL MEMORY isn't usable and so we lost 384KB of memory. Is this > > right? > > for DOS, withouth upper memory manager yes ;)
I'm talking about an OS in protected mode... in any case how can I access to this memory region if it's mapped for other things?
I've done some tests with a simple kernel which I wrote: all that region (except video memory at 0xb8000) results "read only"...
So I THINK YOU mean: "you can use more than 640KB in real mode using a memory manager that "remap" 0xC0000 (for example) to 0x100000 or something like it"
Right?
bye, Paolo
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