Gerard Gerritsen wrote in a message to Mike Bilow:

 MB>   However, the real problem is that 32-bit programs are almost always
 MB> written in "flat" model, where all code is mapped by a single
 MB> selector in the LDT.

 GG> Well make an extra entry, there will be some extra overhead,
 GG> but it should work...

It's still pointless.  If you really, really need IOPL access from a 32-bit
program, then the way to do that is to link in a 16-bit IOPL segment and
call into it using a compiler-generated thunk.  There are tons of files
around explaining how to do it.

For FReq (1:323/107) or download (+1 401 944 8498):

IOPLEMX.ZIP     7K  6-10-95  How to create an IOPL segment with emx+gcc.
IO386.ZIP       3K 11-23-92  How to do port I/O in 32-bit programs
IOPL32.ZIP     24K 11-28-92  Demonstrates how to access I/O ports w/IBM C Set/2
PORTIO2.ZIP    80K  7-11-93  Port I/O and IOPL examples for IBM C and Borland C
 
-- Mike


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