Nestopia doesn't emulate the CMC'80s Demo correctly because of what Marty has determined to be a VBL power-up timing bug (link). As I stated in that thread, I couldn't seem to find a test by blargg that is specifically for this issue. Does blargg need to update his tests?
blargg doesn't NEED to do anything. If you want him to update his test, you should at least say please. 
his test pass on an nes, so they shouldnt be wrong.
perhaps blargg could mkae more test ? i am patiently waiting.
soon as i figure out how to remove the chips from a game a and burn an eprom, ill test it myself.
matt
perhaps blargg could mkae more test ? i am patiently waiting.
soon as i figure out how to remove the chips from a game a and burn an eprom, ill test it myself.
matt
motivation = benefit / cost
Code:
if ( apologyNeeded( ) )
{
cout << "I'm sorry I didn't say please right from the start. I didn't";
cout << " know this would be treated as a request.";
}
else
{
brain_gpf( ); // :roll: Oops, smilies don't work inside a code tag
}
{
cout << "I'm sorry I didn't say please right from the start. I didn't";
cout << " know this would be treated as a request.";
}
else
{
brain_gpf( ); // :roll: Oops, smilies don't work inside a code tag
}
Well... my point is that I need some clarification on whether any of blargg's tests are specifically for "VBL power-up timing." I might have forgotten something when I was originally writing this thread. After that is answered, we can let this thread die.
I think my tests never became conclusive enough on the issue. I wanted to determine all power-up behavior but it proved to be more complex than I was willing to probe. The most recent test code I have from October 2005 is commented with this: "The VBL flag ($2002 bit 7) is set at power-up and clear at reset. It is next set about 27384 clocks later." I probably posted about this in another thread last year when I was testing it.
I know Disch's "hack" about the VBlank flag on startup to get Cobra Triangle working. However, on my side, I *had* to keep the VBlank flag raised on power up. No annoyances on homebrew/test ROMs as far as I know.
Oops, I should have realized that ! apologyNeeded( ) was pretty much a given... 
I think some of you might be making this too complicated:
I haven't read the Nestopia source code, nor am I a NES technical expert.
I think some of you might be making this too complicated:
On the Nestopia forums, Marty wrote:
The bug was simply a coding typo. To be specific, line 653 in NstPpu.cpp:
if (phase != &Ppu::WarmUp || stage < WARM_UP_FRAMES)
should really just be:
if (phase != &Ppu::WarmUp)
(link)
if (phase != &Ppu::WarmUp || stage < WARM_UP_FRAMES)
should really just be:
if (phase != &Ppu::WarmUp)
I haven't read the Nestopia source code, nor am I a NES technical expert.