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SBL vs SGL - 320x480 sprite res

vbt - Aug 23, 2008

		vbt		Aug 23, 2008
			I've tried to test 32x480 res with the SBL I expected to use not interlaced display but it's not possible, it allow only 320x240 interlaced. On the SGL it's possible to set sprite res to 320x480 but there is now ay to know if it's interlaced or not. So are the 320x480 of the SGL the same as 320x240 interlaced of the SBL ?

		RockinB		Aug 23, 2008
			As far as I know, anything abover 256 lines is interlaced on a standard TV. However, if I remember correct, there is some sort of hires TV output possible, which may allow progressive display. Charles MacDonald entered in a C4 with a demo of that, he also offered a version suited for standard TVs.

		antime		Aug 24, 2008
			RockinB said: As far as I know, anything abover 256 lines is interlaced on a standard TV. However, if I remember correct, there is some sort of hires TV output possible, which may allow progressive display. That is correct. However when using the HDTV modes you only get high-resolution VDP2 graphics - the sprites are zoomed to double size so you still only have a 240 line vertical resolution. The high vertical resolutions are produced using the double-interlace feature, where you draw the even-numbered rows into one buffer and the odd-numbered ones in the other. This setup pretty much means you must hit full frame rate or get glitchy graphics (eg. the screen resolution suddenly drops because the same buffer is displayed for both the even and odd lines).