Blitz Basic Questions - Page 9

Shatterhand · 06 September 2019, 06:08

Erm...

Shouldn't a

Code:

VWait
Print VPos

Always show exactly the same result?

Master484 · 06 September 2019, 12:09

Yes.

Unless you have some VBLANK interrupt code going on, which I think can have an effect on the VPOS value right away VWAIT, especially if you're playing music from the VBLANK interrupt, which takes a long time to execute.

But if you're not using interrupts, then the VPOS value shown right after VWAIT should remain constant.

Although things like display bitplane depth and other stuff have an effect on what the VPOS is right after VWAIT. But the value itself should remain the same during the program.

06 September 2019, 06:08	#161
Shatterhand Warhasneverbeensomuchfun Join Date: Jun 2001 Location: Rio de Janeiro / Brazil Age: 41 Posts: 3,450	Erm... Shouldn't a Code: VWait Print VPos Always show exactly the same result?

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06 September 2019, 12:09	#162
Master484 Registered User Join Date: Nov 2015 Location: Vaasa, Finland Posts: 525	Yes. Unless you have some VBLANK interrupt code going on, which I think can have an effect on the VPOS value right away VWAIT, especially if you're playing music from the VBLANK interrupt, which takes a long time to execute. But if you're not using interrupts, then the VPOS value shown right after VWAIT should remain constant. Although things like display bitplane depth and other stuff have an effect on what the VPOS is right after VWAIT. But the value itself should remain the same during the program.

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