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Re: Added Jaleco VJ, and workable Stepstag driver
01/25/18 03:39 AM
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The palette is in 32-bit format: 8-bit for each U, Y1, V, and Y2. I tried to convert it to RGB in the palette-ram-writing handler(to verify its format) by using the first 3 elements, U, Y1, V, but ignored Y2. The resule looked OK.
While, in the real machine, there's also a MPEG video layer. The sprite layer is mixed with MPEG decoder's YUV output stream, then converted together to RGB. That's why its palette uses YUV instead of RGB.
For the 2nd Y element, many years ago I observed a "Stepping Stage 2" machine and noticed that its screens were in interlaced-mode, should be 480i. The video memories show only 240 lines in logical, so it is the palette that gives 2 pixels for odd/even scan field, I guess.
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Re: Added Jaleco VJ, and workable Stepstag driver
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Added Jaleco VJ, and workable Stepstag driver
