> On Fri, Aug 26, 2011 at 11:25:37AM +0200, Anders Carlsson wrote: >> Marko Mäkelä wrote: >> >>> If I remember correctly, my demo program would switch the display >>> to an interlaced 8x16 font on the 6560. >> >> Hm, I always thought the interlace bit on the 6560 just toggles >> the chip from producing 30 full (progressive) frames @ 60 Hz to >> producing 60 half (interlaced) frames. Does the perceived vertical >> resolution really improve? > > I would say that it does. Please try my test program. It switches > the font on every half-frame, using a video-synchronized timer > interrupt as a poor man's raster interrupt. I think Anders was saying that in interlace mode, the VIC displays the same picture on both even and odd field (but one of them shifted a half line down). You of course trick it into displaying a different picture every field :-) Btw, the 6560 datasheets say it is 262.5 lines per field for interlace mode (like NTSC should be), and 262 for non-interlace mode; your docs (and everything else I googled) say it is 261. Which is wrong? (PAL should be 312.5, your doc says 312; that's also what the VIC-II does). Segher Message was sent through the cbm-hackers mailing listReceived on 2011-08-26 15:00:04
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