On Thursday 18 March 2004 11:54 am, Doug Holland wrote: > I just upgraded to xmame 0.80.1, and I'm still running into the bug where > if I run starwars, start the game, select medium or hard difficulty, and > play through the tie-fighter stage, the game does not zoom into the Death > Star and move to the next stage. > > After googling and reading the last thread on this topic, it was mentioned > that there was some sort of kludge to work around this. > > Could somebody post the kludge or tell me where I can go to find a fix? > > Doug
HAH! Found the fix for the infamous Death Star bug!
Go to src/machine/starwars.c. On or about line 294, you should find the line
ACC=ACC+( ( (long)((A-B)*C) )>>14 );
Replace it with
ACC += ((((long)((A - B) * C)) >> 13) + 1) >> 1;
I found this in an older version of that file (from version 0.69).
The code there read
if (IP15_8 & LDC)
{
C = RAMWORD;
/* TODO: this next line is accurate to the schematics,
but doesn't seem to work right */
/* ACC=ACC+( ( (long)((A-B)*C) )>>14 ); */
/* round the result - this fixes bad trench vectors in
Star Wars */
ACC += ((((long)((A - B) * C)) >> 13) + 1) >> 1;
}
Please test this and make sure this hack works.
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