--- "Arkady V.Belousov" <[EMAIL PROTECTED]> wrote:
> Then I completely not understand you. "DTA" is a name for area, which
> used for findfirst/findnext. What _you_ name as "DTA"?
My mistake - I was confusing SHSUCDX (the redirector has what is called
a DTA to point to the read address) and the device driver's Read command
which is called XfrAddr (by SHSURDRV).
So to clarify: the kernel asks the device driver to read a sector. In
order to perform this, FDRV swaps DOS out to perform the read via DOS,
then swaps DOS back in. However, sometime after 2035a the buffer for the
sector is itself in the SDA, so the newly read sector is overwritten
when DOS gets swapped back.
Jason.
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