Radeon 9200 and interlace

I have an ASUS Radeon9200SE card but I can't get it to work properly with
interlaced displays.

Advv says "interlace is not supported" even if my card is listed as fully
supported according to the carddos.txt file.
Advmame doesn't complain when starting an intelaced display (e.g. tapper) 
but
the display is messed up. What happens is that in the top half of the 
display
the first half of the even lines are displayed and in the bottom the first
half of the odd lines are shown (confirmed with a camera)

So instead of a normal interlace display where lines are display as:
0,2,4,...,446 VBLANK 1,3,5,...,447

It is displayed as
0,2,4,...,222,1,3,5,...,223 VBLANK 0,2,4,...,222,1,3,5,...,223

I am using the dos version of advmame87

Interlace works fine in windows with powerstrip.



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