From: Jim Brain (brain_at_jbrain.com)
Date: 2007-12-15 20:12:41
David Wood wrote:
> Jim,
>
> Right. The concept I had in mind was to write a couple adjacent buffers to
> a specific sector, read the target sector to write to these buffers, modify,
> and write the target sector back to disk. Then, the buffers are restored
> from the disk.
>
> However, I do realize that this limits the number of possible open files to
> (most likely) 3, as two buffers would be swapped out in the process. Some
> intelligent code could choose two adjacent buffers that aren't the one to be
> written I suspect, eliminating this issue. Since there are five buffers,
> there shouldn't be any instance where there aren't two adjacent buffers that
> won't be involved in a given disk transaction.
>
>
>
I didn;t think about the idea of pre-saving two buffers and then loading
them afterwards. That would definitely eliminate the need for a RAM.
Still, since you need to add HW to use the IDE interface, 1 kB RAM is
trivial to add. Still, folks could use your idea until a design shows
up with some RAM.
Great ideas.
Jim
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