Re: [stella] Weird timing bug, I!

Subject: Re: [stella] Weird timing bug, I!
From: Thomas Jentzsch <tjentzsch@xxxxxx>
Date: Sat, 20 Apr 2002 22:27:27 +0200
At 20.04.2002, 22:02, Adam Thornton wrote:
>> Did you change that part of code or is that original Dark Mage code? If
>> it's original code, then does Dark Mage work on your TV?

> I think it's original code, and I don't have a Dark Mage cart.  I'll try
> Dark Mage on my Supercharger....

> Same as FotR, actually. Yellow text, red background.

> Now the really weird thing...Randy tried the game before he shipped it
> and it played fine for him.  And I tried it again today, and today it
> was readable although the background was doing this weird red/purple
> pulsing color thing.

> I'm guessing that it's just-a-little out of NTSC spec, and that Randy's
> TV can cope, and mine sort of can, better today than it could
> yesterday.

I think you are right. The 2 2/3 VSYNC lines are probably very close to
an acceptable timing for your TVs. And since everything is analog, only
a minor influence (temperature, humidity, position of cable etc.), might
make it possible or impossible for the TV to sync.

> But that still leaves the question, why does the SC behave differently
> than the ROM?

I can only guess, that the SC has also some minor (in your case
positive) influence on the signal. And that is just enough to make the

Anyway, I would try to add one more WSYNC.

Have fun!
Thomas Jentzsch         | *** Every bit is sacred ! ***
tjentzsch at web dot de |

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