> Meaning the level of the luma varies from pixel to pixel (or more > than one pixel - haven't counted/measured so can't say now exactly > how wide the period of this wave is but looks close to two pixels) > creating various patterns in place where a solid colour would be > expected (at least horizontally). Various, because it seem to > depend on which colour is actually selected. There are nine vertical stripes per sixteen pixels. Internally on the VIC-II, there are two colour clocks, 90 deg out of phase; one of-em is flipped polarity every other scan line. So you see the "stripes" when the non-flipped component is dominant for your colour, and the "checkerboard" when the flipped one is. > I am wondering if anyone knows (before I start disassembling the SX > in order to experiment) whether this effect can be caused by the > differences in the clocks generation methods between regular 64 and > the SX or something else (like the output amp). It looks to me like the chroma signal is imprinting on the luma signal; this happens somewhere at the output end, not at the clock gen. But you haven't described the clock gen construction, so we cannot really tell :-) Segher Message was sent through the cbm-hackers mailing listReceived on 2013-05-03 01:00:03
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