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Raster Time
http://forums.nesdev.com/viewtopic.php?f=2&t=15732
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Author:  Oziphantom [ Thu Mar 30, 2017 4:52 am ]
Post subject:  Raster Time

How do you show frame raster time on a NES?

Author:  tepples [ Thu Mar 30, 2017 5:46 am ]
Post subject:  Re: Raster Time

Turn bit 0 of $2001 on (1) for 200-500 cycles, then turn it back off. This will make a gray stripe across the screen. To color the stripe, use one or more of bits 7, 6, and 5 of $2001.

Author:  Dwedit [ Thu Mar 30, 2017 6:26 am ]
Post subject:  Re: Raster Time

Or you can use any other mask bits of your choice, such as leftmost column background enable/disable.

Author:  Oziphantom [ Thu Mar 30, 2017 6:57 am ]
Post subject:  Re: Raster Time

Nice, thanks.

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