From: "wbinvd" <wbinvd AT my-dejanews DOT com>
Newsgroups: comp.lang.asm.x86,comp.lang.pascal.borland,comp.os.msdos.djgpp
Subject: Re: How to align DOS memory block on page boundaries?
Date: 17 Aug 1998 12:52:19 GMT
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Approved: <johnfine AT erols DOT com>
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davidk wrote in message <6r7slh$6ce$1 AT winter DOT news DOT erols DOT com>...
|The most robust way is you should test to see if the block is going to hit
|the page boundary, and if it does, then do two DMA transfers; first one
|starting at the block location, with the size up to the boundary, and the
|second starting at the boundary, with the remaining size.


That's not always possible. The FDC can only transfer whole sectors
and cannot start in the middle of one.