Hi,
I like to show you how I make graphics on screen2 interlaced.
The program I use is the Promotion of PC, to make a graph with MSX1 palette and subject to the limitations of color that has Screen2, activating the grid, then I add another frame, at the second frame made the changes, to animate use the key number 2, we see how interlace, although not shown as well as in a real msx but help us, the program is this:

By tonigalvez at 2010-10-26
Here I can show you how to mix colors by stripes, the color range is increased to have over 100 colors in a MSX1:

By tonigalvez at 2010-10-26
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By tonigalvez at 2010-10-26
Result

By tonigalvez at 2010-10-26
This sunset:

By tonigalvez at 2010-10-26
Result

By tonigalvez at 2010-10-26
A logo:

By tonigalvez at 2010-10-26
+

By tonigalvez at 2010-10-26
Resulting

By tonigalvez at 2010-10-26
This is some screens from Menace game we released on MSXDEV 2009:

By tonigalvez at 2010-10-26
Resulting

By tonigalvez at 2010-10-25
All using only MSX1 palette, you see using interlaced get 3 colors for each line of 8x1, plus more variety of colors, while the zone change is small, not so much flash as the demo that is out there with graphics intertlaced, because the demo has large flat areas of color change, that makes it much more annoying. We can swap colors between horizontal lines or frames.
Using a set of 256x64, which like the msx has 3 groups, then use only the first in 256x64 128x64 I put two screens, one beside the other, once finished graph must pass by and get the file BMP2MSX SC2, which is what the programmer needs. Only copy to Vram once, all the interlaced effect is changing the name tables of chars. 50 or 60 times between the two frames.
Solores always used similar range, never a white with a dark blue color, because most noticeable flicker.
Here I put the Menace sprites that use interlacing to get more colors, and can even make semitransparent effect (as they used to use a lot in the Sega Megadrive)
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By tonigalvez at 2010-10-26
As you see on Menace, we use interlaced in all the game parts, this effect consumes some cpu but not too much.
