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echo: public_domain
to: Rod Speed
from: Paul Edwards
date: 1994-08-30 21:26:48
subject: dos extenders

Can you confirm the operation of dos extenders.  I can
understand that once in protected mode you can access
all memory and use 32-bit instructions.  Now presumably
when an application (which I compiled with watcom c
with a dos extender) needs to read from a file, it would
normally call INT 21.

However, the memory you want the data put in is too high,
so I would presume that Watcom would be written so that
instead of calling INT 21 itself, it calls a dos extender
function.  The dos extender people would have a function
for every single interrupt.

The dos extender people then go and retrieve the stuff
into low memory, then copy it into high memory.  Is all
that right?  BFN.  Paul.

@EOT:

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