On Sat, 26 Apr 2003, Ruslan Ermilov wrote: > On Fri, Apr 25, 2003 at 02:46:26PM -0700, Terry Lambert wrote: > > John Baldwin wrote: > > > > > > > > John, is there a way to fix btx/loader/whatever so that > > > > heap memory is not limited to 640K? > > > > > > Not really. At least, not easily. We load the kernel up above 1mb, > > > but we don't know how much memory lives up above 1mb and we assume > > > that there is enough for the kernel and that's it. > > > > You are limited to what you can access in real mode, without > > Gate A20 (16M, at which point the address space wraps). > > > Shhh, don't tell this anyone! ;-) > > A20 (21th address line) allows one to access up to ffff:ffff > byte, that is (1M + 64K - 16) bytes of memory. Actually, you can access the entire 4GB of memory in "unreal" mode. <http://x86.ddj.com/ddj/aug98/aug98.htm> -- :{ andyf_at_speednet.com.au Andy Farkas System Administrator Speednet Communications http://www.speednet.com.au/Received on Sat Apr 26 2003 - 13:04:41 UTC
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