Re: 1541IDE and 1541IDE-S -- and 8250IDE? (and 64IDE, now)

From: Jim Brain (
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.


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