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I managed to reproduce the problem on one of my machines.
From what I can see, Intel BIOS needs 32bit I/O AND also passthrough of F000-F004.
So at least, it needs combination of VIDEOPRT.SYS driver AND 32bit IO fix.
As you already patched VIDEOPRT.SYS to work on Win 7, can you upload your copy (ideally source + compiled version) so that I can test with it?
Thanks.
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