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I was wondering more about whether that screen is a different part of the framebuffer, or the other set of three boards. ;) IIRC, there are six FB boards. One set for Y,U,V, and another set for the back buffer.
Not entirely. :) Will clarify in a follow-up tweet, I'll need as much free characters in my tweets as possible.
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There are 3 independent frame stores per set of stores: Luma, Chroma, and "Ext" (usually used for stencil operations). Chroma alternates U and V on even and odd columns, which is why I try to describe it as "16-bit ish" colour depth rather than 16-bit YUV. It has a 2:1 L:C ratio.
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Each Frame Store card has 640kbytes of RAM, arranged internally as 640x1024 bytes, or more accurately, ten "stripes" of 64x1024 bytes. There are six in a standard system. The top 128 lines of each Frame Store are reserved for the palette box (I) or the menu box (II).
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